Module 16 Piston Engine Question Bank Part-1
(506 Questions)
1. A heat engine is a device which converts. (L-1)
1)one form of energy into another form of energy
2) electrical energy into mechanical energy
3) heat energy into mechanical energy
4) chemical energy into heat energy
(Ref. FAA – 12A, Page – 1)
2. The thrust producing device for a piston engine aircraft is : (L-1)
1) propeller 2) Fixed orifice 3) aircraft wings 4) crankshaft
(Ref. FAA – 12A, Page – 2)
3. The propulsive working fluid for a piston engine is.(L-2)
1) fuel/air mixture
2) oxidizer/fuel mixture
3) ambient air
4) hot gases produced after combustion of air/fuel mixture
(Ref. FAA – 12A, Page – 1)
4. The service ceiling of turbo supercharged engine is: (L-2)
1) Slightly lower than conventional reciprocating engine
2) Slightly lower than turboprop engine
3) Slightly higher than turboprop engine
4) Slightly higher than the turbo jet engines
(Ref. FAA – 12A, Page – 4)
5. Choose the correct option: (L-1)
1) The propeller of a/c powered by reciprocating engine accelerates a large mass of air through a large velocity change
2) The propeller of a/c powered by reciprocating engine accelerates a smaller quantity of air through a large velocity
change
3) The propeller of a/c powered by reciprocating engine accelerates a smaller quantity of air thorough a small velocity
changes
4) The propeller of a/c powered by reciprocating engine accelerates a large mass of air thorough a small
velocity change
(Ref. FAA – 12A, Page – 1)
6. The continued reliability of the engine is determined by the: (L-2)
1) Manufacturer
2) Maintenance & overhaul personnel
3) Maintenance, overhaul & operating personnel
4) Only by operating personnel
(Ref. FAA – 12A, Page – 4)
7. Most reciprocating engines operate on the four stroke cycle which is a:- (L-2)
1) Constant pressure cycle
2) Constant volume cycle
3) Constant temperature cycle
4) Brayton cycle
(Ref. Jeppsen Power Plant , Page (1 – 34))
8. In the compression stroke of a diesel cycle engine , the fluid compressed is : (L-1)
1) fuel/air mixture 2) fuel vapour s only 3)air only 4) both 2) and 3) are correct
(Ref. Kroes and wild Power Plant, Page – 48)
Page 1 of 50
9. Piston engines are classified according to : (L-2)
1)arrangement of cylinders 2) media of cooling 3) no of strokes/cycle 4)all the above
(Ref. Kores and wild Power Plant, Page – 6)
10. Prony brake is used to measure (L-2)
1) IHP
2) BHP
3) FHP
(Ref. FAA – 12A, Page – 34)
4) all
11. After ignition, cylinder pressure reaches maximum (L-2)
1) at TDC
2) shortly after TDC 3) just before TDC
4) near BDC
(Ref. FAA – 12A, Page – 33 & Kores and wild Power Plant, Page – 51)
12. One horse power equals to (L-2)
1) 33,000 ftlb/sec 2) 33,000 ft lb/min 3) 33,000 inlb/min 4) 33,000 in lb/sec
(Ref. FAA – 12A, Page – 2,33)
13. In a piston engine, the reciprocating and rotary motions are conducted respectively by (L-1)
1) crank-shaft and cam-shaft
2) cam-shaft and magneto-shaft
3) piston and crank-shaft
4) crank-shaft and propeller-shaft
(Ref. FAA – 12A, Page – 11)
14. An engine having the bore equal to stroke is often called a (L-2)
1) typical engine 2) piston engine 3) similar engine 4) square engine
(Ref. Kores and wild Power Plant, Page – 42 & 50)
15. The value indicated by the scale in prony brake before the force is applied is (L-2)
1) neglected
2) Tare
3) added with actual force
(Ref. Kores and wild Power Plant, Page – 51)
4) both 2) and 3)
16. The distance between TDC and BDC inside the cylinder is called : (L-1)
1) throw
2) bore
3) stroke
4) length
(Ref. Jeppsen Power Plant, Page – (1-34))
17. One complete 4 - stroke cycle of a reciprocating engine requires: (L-1)
1) One revolution of the crankshaft
2) Two revolutions of the crankshaft
3) Three revolutions of the crankshaft
4) Four revolutions of the crankshaft
(Ref. FAA -12A, Page -28 & Jeppsen Power Plant, Page (1-34))
18. The limit of travel to which the piston moves inside the cylinder away from crankshaft is called (L-2)
1) TDC
2) BDC
3) stroke
4) Bore
(Ref. Kroes & Wild Power Plant, Page -42)
19. The ratio established between the total volume of space when the piston is at BDC and the volume when the
piston is at TDC is called as (L-)
1) volumetric efficiency
2) piston displacement
3) clearance volume
4) compression ratio
(Ref. FAA-12A, Page -31)
20. When defining PLANK for four stroke engine N stands for :
1) number of power strokes per minute or rpm/2
2) number of cylinder
3) no of power stroke
4) area of piston head
(Ref. FAA-12A, Page-33)
21. The engine working fluid of reciprocating engine is:
Page 2 of 50
1) Fuel/air mixture
3) Ambient air
(Ref. FAA-12A, Page-1)
2) Air/ fuel mixture
4) Both 1) & 2) are correct
22. If the weight of an engine per brake horsepower is decreased:
1) The useful load that an a/c can carry is decreased
2) The performance of the a/c is reduced obviously
3) The performance of the a/c is increased obviously
4) The brake specific fuel consumption of the a/c is increased
(Ref. FAA-12A, Page-2)
23. The brake specific fuel consumption for reciprocating engine is the:
1) Fuel flow lbs / hr / Thrust lb)
2) Fuel consumed lbs /hr / B H P
3) Fuel flow lbs / hr / I H P
4) Fuel flow lbs / hr / T H P
(Ref. Kroes & Wild Power Plant, Page-58 & 119)
24. The position which the piston has reached when it is at a minimum distance from the centerline of the crankshaft
is called:
1) B D C
2) T D C
3) Stroke
4) Bore
(Ref. Kroes & Wild Power Plant, Page-42)
25. The stroke during which the piston is forced down as the result of combustion pressure is called:
1) Power stroke
2) Expansion stroke
3) Exhaust stroke
4) Both 1 & 2 are correct
(Ref. Kroes & Wild Power Plant, Page-43)
26. In which stroke both exhaust & intake valve are closed:
1) Compression stroke
2) Intake stroke
3) Power stroke
4) Both 1 & 3
(Ref. Kroes & Wild Power Plant, Page-44)
27. The actual horsepower delivered by an engine to a propeller is called:
1) IHP 2) BHP
3) FHP
4) IMEP
(Ref. FAA-12A, Page-34)
28. Total volume of a cylinder is equal to:
1) Swept volume + clearance volume
2) Displacement volume + clearance volume
3) Both 1) & 2) are correct
4) Swept volume - clearance volume
(Ref. FAA-12A, Page-37)
29. The actual power delivered to the propeller is called
1) FHP
2) BHP
3) IHP
4) mechanical efficiency
Ref. FAA -12A, page – 34
30. In a four stroke cycle engine, the operation are in sequence
1)suction, compression, expansion & exhaust
2)compression, expansion, suction & exhaust
3)suction, exhaust, expansion, compression
4)none
(Ref. FAA-12A, Page-28)
31. The expansion of hot gases takes place in the 4 stroke cycle engine during
1) compression stroke 2) exhaust stroke 3) intake stroke 4) power stroke
(Ref. Kroes and Wild, Page-43)
Page 3 of 50
32. In 4-stroke cycle petrol engine the pressure inside the cylinder during exhaust stroke is
1) above the atmospheric pressure 2) below the atmospheric pressure
3) at the atmospheric pressure
4) none
(Ref. FAA-12A, Page-30)
33. An engine working with piston and cylinder is called a
1) piston engine
2) gas turbine engine 3) propeller engine 4) rotary engine
34. Thermal efficiency of petrol engine is about
a 15%
b 25%
c 30%
d 70%
(Ref. FAA-12A, Page-37 & 38)
35. BHP/IHP x 100 is formula used to calculate :
1) mechanical efficiency
2) thermal efficiency
3) volumetric efficiency
4) operating efficiency
(Ref. FAA-12A, Page-37)
36. A supercharged engine always has a volumetric efficiency of:
1) 100 %
2) Less than 100 %
3) More than 100 %
4) 120 %
(Ref. FAA-12A, Page-38 & Kroes & Wild Power Plant, Page -55)
37. Exhaust back pressure will reduce:
1) Propulsive efficiency
2) Mechanical efficiency
3) Thermal efficiency
4) Volumetric efficiency
(Ref. Kroes & Wild Power Plant, Page-60)
38. Propulsive efficiency is the ratio of:
1) (B H P / I H P) x 100
3) (T H P / B H P) x 100
(Ref. FAA-12A, Page-38)
2) (B H P / THP) x 100
4) (T H P / FHP) x 100
39. A condition that can occur in radial engines but is unlikely to occur in horizontally opposed engine is
1) zero valve clearance
2) valve overlap
3) hydraulic lock
4) none
(Ref. FAA-12A, Page-457 & Jeppsen Power Plant, Page – (2 -13))
40. Which of the following do not affect volumetric efficiency
1) high carburetor air temperature
2) sharp rise in induction system
3) full throttle operation
4) improper valve timing
Ref. FAA-12A, Page-38
41. The cylinder heads of radial engines are provided with fitting to accommodate rocker- box, inter cylinder drains
for
1) even pressure among cylinder head
2) even oil flow among cylinder head
3) adequate lubrication for all rocker boxes
4) all of the above
Ref. Kroes & Wild Power Plant, Page – 77
42. CR must be limited because
1) it increases HP
2) it increase manifold pressure
3) it increases temp & pressure
4) 1 & 3 are correct
Ref. Kroes & Wild Power Plant, Page – 58
Page 4 of 50
43. If IO 250 BTC, IC 550 ABC, EO 550 BBC and EC150 ATC, then valve overlap is
1) 300
2) 250
3) 400
4) 450
Ref. Kroes & Wild Power Plant, Page – 45
44. Valve lead or lag are greater towards
1) TC position
2) BC position
Ref. Kroes & Wild Power Plant, Page – 45
3) it is same near TC & BC
4) none
45. If IO 200 BTC and IC 450 ABC, then duration of valve opening is
1) 2550
2) 2450 3) 1550
4) 1650
Ref. Kroes & Wild Power Plant, Page – 46
46. In petrol engine, the charge is ignited by
1) spark plug 2) compression
3) both 1 & 2
Ref. Kroes & Wild Power Plant, Page – 43
4) none
47. The ignition takes place due to heat produced in the engine cylinder at the end of compression in
1) petrol engine
2) diesel engine
3) steam engine
4) all
Ref. Kroes & Wild Power Plant, Page – 48
48. Sparking increases
1) pressure, temperature, volume
2) pressure
3) temperature, pressure
4) volume
Ref. Kroes & Wild Power Plant, Page – 43
49. The time valves are off their seat is called
1) opening time
2) duration
Ref. Kroes & Wild Power Plant, Page – 46
3) Induction
4) none
50. The wedge shape pistons rings are fitted to obtain :
1) sliding action 2)self cleaning action 3)both 1 and 2 are correct
Ref. Kroes & Wild Power Plant, Page – 27
4)none
51. In radial engine, the valve actuating device is :
1) cam shaft
2) cam plate or cam ring
Ref. Kroes & Wild Power Plant, Page – 34
4) any
3) cam box
52. During valve overlap
1) both valve are seated
2) combustion
3) both valve are off their seat
4) pressure inside chamber is maximum
Ref. Kroes & Wild Power Plant, Page – 44,45
53. An “Otto” cycle is a
1) constant pressure cycle
2) constant temperature cycle
3) constant volume cycle
4) constant pressure and constant volume combined cycle
Ref. Jepssen Power Plant, Page-(1-33)
54. If an engine operates at 2000 rpm, the piston will move up and down in 1 minute :
1) 2000 times
2) 1000 times
3) 4000 times
4) 1500 times
Ref. Kroes & Wild Power Plant, Page – 42
55. During 7200 rotation of crank-shaft of a 4 stroke-engine, the intake and exhaust valves only open
1) once
2) twice
3) as required in the cycle
4) once and sometimes twice
Page 5 of 50
Ref. Kroes & Wild Power Plant, Page – 44,45
56. The heat energy utilized for power output is:
1) 30 to 40 % of the total heat energy
2) 15 to 20 % of the total heat energy
3) 40 to 45 % of the total heat energy
4) 5 to 10 % of the total heat energy
Ref. FAA-12A, Page-37
57. The ratio of the power produced by an engine to the power theoretically available in the fuel is known as
1) Propulsive efficiency
2) Mechanical efficiency
3) Thermal efficiency
4) Volumetric efficiency
Ref. Kroes & Wild Power Plant, Page – 55
58. The specified timing of the valve represents the:
1) Start of opening of the valve
2) Full open position of the valve
3) Full closed position of the valve
4) All of the above are correct
Ref. FAA-12A, Page-21
59. The opening or closing of the intake or exhaust valves after top center or bottom center is called:
1) Valve overlap
2) Valve lag
3) Valve lead
4) None
Ref. Kroes & Wild Power Plant, Page – 45
60. For which principal reasons the exhaust valve opens before B D C in power stroke?
1) More through scavenging of the cylinder
2) Better cooling of the engine
3) Both 1 & 2 are correct
4) Increasing power
Ref. Kroes & Wild Power Plant, Page – 45
61. The number of power strokes per minute in a 4) stroke engine is equal to the:
1) rpm /2 times the number of cylinders
2) rpm /4 times the number of cylinders
3) rpm/2 times the bores
4) rpm /2
Ref. FAA-12A, Page-33
62. The five events of a four stroke cycle engine in the order of their occurrence are:
1) Intake, ignition, compression, power exhaust
2) Intake, power, compression, ignition, exhaust
3) Intake, compression, ignition, power, exhaust
4) Intake, compression, power, exhaust, ignition
Ref. Kroes & Wild Power Plant, Page – 44
63. Using the following information, determine how many degree crankshaft will rotate with both
intake and exhaust valves seated:
I O 150 BTDC
EO 700 BBDC
IC 450 ABDC EC 100 ATDC
1) 290 degree
2) 245 degree
3) 373) degree
4) 25 degree
Ref. Kroes & Wild Power Plant, Page – 45
64. Which statement is correct regarding a four stroke cycle a/c engine?
1) The intake valve closes on the compression stroke
2) The exhaust valve opens on the exhaust stroke
3) The intake valve closes on the intake stroke
4) The exhaust valve closes on the exhaust stroke
Page 6 of 50
Ref. Kroes & Wild Power Plant, Page – 43
65. If the exhaust valve of a four - stroke cycle engine is closed and the intake valve is just closing, the
piston is on the:
1) Intake stroke
2) Power stroke
3) Compression stroke
4) Exhaust stroke
Ref. Kroes & Wild Power Plant, Page – 45
66. When does the ignition event take place in a four-stroke cycle a/c reciprocating engine?
1) Before the piston reaches TDC on compression stroke
2) After the piston reaches TDC on power stroke
3) After the piston reaches TDC on compression stroke
4) Just after the piston reaches TDC on compression stroke
Ref. Kroes & Wild Power Plant, Page – 45
67. If the Intake valve closes 60 degree ABC on compression stroke then the valve lag is:
1) 240 degree 2) 120 degree 3) 60 degree 4) 135 degree
Ref. Kroes & Wild Power Plant, Page – 45
68. By using the valve-timing diagram, it is possible to determine:
1) The rotational distance of crankshaft travel while each valve is open
2) The rotational distance of crankshaft travel while each valve is closed
3) Both 1 & 2 are correct
4) The rotational distance of crankshaft travel through each valve is fully opened and closed
Ref. Kroes & Wild Power Plant, Page – 45
69. What will be the thermal efficiency of a piston engine that produces 150 BHP while burning 8 gallons of aviation
gasoline per hour?
1) 19.8%
2) 29.8%
3) 39.8%
4) 49.8%
Ref. Kroes & Wild Power Plant, Page – 54
70. In a valve timing diagram, the intake valve opens 15 degree BTC during exhaust stroke and closes 60 deg ABC
during compression stroke, then the total period the valve remains opened in a cycle is :
1) 230 deg 2)235 deg
3) 255 deg
4)260 deg
Ref. Kroes & Wild Power Plant, Page – 45
71. The burning of fuel/air mixture in the intake pipelines or, intake manifold is referred as
1) after firing
2) back firing
3) flow blow by
4) normal firing
Ref. FAA-12A, Page-445
72. After firing is caused because of
1) excessive rich mixture
2) improper valve timing
3) faulty ignition
4) all the above are correct
Ref. FAA-12A, Page-446
73. Stoichiometric ratio is
1) chemically correct fuel air ratio by weight
2) chemically correct air fuel ratio by volume
3)actual air/fuel ratio for maximum efficiency
4) none
Ref. Jepssen Power Plant, Page-(1-48)
74. If the fuel/air mixture burns inside a container and the hot gases directed through a jacket to inside of a cylinder to
actuate piston is called
1) an internal combustion engine
2) an overheating engine
3) an electrical combustion engine
4) an external combustion engine
Page 7 of 50
75. The ignition occurs before normal ignition which is not required for an engine is called
1) advance ignition
2) normal ignition
3) retard ignition
4) pre-ignition
Ref. Kroes & Wild Power Plant, Page – 57
76. The average pressure acts on piston head is called :
1) mean effective pressure 2) average effective pressure
3) mean pressure
4)useful total pressure
Ref. FAA-12A, Page-33
77. During compression stroke, if the burning of fuel/air mixture completes before TDC and the engine crankshaft has
a tendency to rotate reverse is termed as :
1) kick back
2) blow-by
3) pulsation
4) combustion knock
Ref. Kroes & Wild Power Plant, Page – 121
78. The total piston displacement of an engine is the total volume displaced by all the pistons during:
1) Half of the revolution of the crankshaft
2) One revolution of the crankshaft
3) Two revolutions of the crankshaft
4) One & half revolution of the crankshaft
Ref. Kroes & Wild Power Plant, Page – 50
79. The total piston displacement of an engine equals to the:
1) Number of cylinders in the engine multiplied by the piston displacement of one cylinder
2) Number of cylinders in the engine multiplied by the Bore of one cylinder
3) Number of cylinders in the engine multiplied by the piston area of one cylinder
4) All of the above are correct
Ref. FAA-12A,Page- 31
80. What will be the engine piston displacement of six-cylinder horizontal opposed engine that has a bore of 4 inches
& a stroke of 3 inches?
1) 540 cubic inches
2) 526 cubic inches
3) 326 cubic inches
4) 226 cubic inches
Ref. Kroes & Wild Power Plant, Page – 50
81. An average pressure inside the cylinders of an internal combustion engine during power stroke is called:
1) Mean effective pressure (MEP)
2) Indicated mean effective pressure (IMEP)
3) Brake mean effective pressure (BMEP)
4) Friction mean effective pressure (FMEP)
Ref. FAA-12A,Page-33
82. The compression ratio of an a/c engine may be increased by:
1) Installing “Domed” head piston
2) Using longer connecting rods
3) Installing a crankshaft with a greater throw
4) All of the above are correct
Ref. Kroes & Wild Power Plant, Page – 58 & Jepssen Power Plant,Page-(1-47)
83. Increasing the compression ratio of an engine causes a:
1) Lower specific fuel consumption
2) Greater thermal efficiency
3) Both 1 & 2 are correct
4) Increases specific fuel consumption
Ref. Kroes & Wild Power Plant, Page – 58
84. Backfiring is caused when:
Page 8 of 50
1) An intake valve opens too early
2) An intake valve sticks in the open position
3) Both 1 & 2 are correct
4) Intake valve opens too late
Ref. Kroes & Wild Power Plant, Page – 44
85. The reading on a manifold absolute pressure gage at sea level when an engine is not running will be about:
1) 29.92 in Hg
2) 10 in Hg
3) 15 in Hg
4) 14. 69 in Hg
Ref. Kroes & Wild Power Plant, Page – 55
86. Manifold pressure gage measures:
1) Absolute pressure
2) Gage pressure
3) Differential pressure
4) Barometric pressure
Ref. Kroes & Wild Power Plant, Page – 55
87. MAP gauge is used with:
1) Supercharged engine
2) Unsupercharged engine using variable pitch propeller
3) Both 1 & 2 are correct
4) Naturally aspirated engine
Ref. Kroes & Wild Power Plant, Page – 55,56
88. To prevent detonation and pre-ignition, operate the engine with the:
1) Proper fuel
2) Correct limits of MAP
3) Correct limits of cylinder head temperature
4) All of the above are correct
Ref. Kroes & Wild Power Plant, Page – 57
89. The combustion of the fuel/air mixture before the spark plug fires is called:
1) Detonation
2) Pre-ignition
3) Backfiring
4) After firing
Ref. FAA-12A,Page-445
90. The fuel/air mixture which the lowest brake specific fuel consumption is called:
1) Best power mixture
2) Lean best power mixtur
3) Best economy mixture
4) Rich best power mixture
Ref. FAA-12A,Page-112 & Kroes & Wild Power Plant, Page – 120
91. Manifold pressure is the average absolute pressure of the:
1) Air in the intake manifold
2) fuel/air charge in the intake manifold
3) Both 1 & 2 are correct
4) As in 3 & measured in units of inches of mercury
Ref. FAA-12A,Page-31
92. The pressure in the cylinder just before the ignition is determined by:
1) Compression ratio
2) Manifold pressure
3) Both 1 & 2 are correct
4) Mean effective pressure
Ref. FAA-12A,Page-32
93. If an engine were operating at a manifold pressure of 15” Hg with a compression ratio of 7 : 1, the pressure at the
instant before ignition would be approximately:
1) 210” Hg
2) 105” Hg
3) 2992” Hg
4) 15” Hg
Ref. FAA-12A,Page-32
94. One of the reason for using engines with high compression ratio is to:
1) Obtain long range fuel economy
Page 9 of 50
2) Convert more heat energy into useful work
3) Both 1 & 2 are correct
4) Obtain more power out put
Ref. FAA-12A,Page-32
95. What will be the indicated horsepower for a six cylinder engines that has a bore of 5 inches, a stroke of 5 inches
and is turning at 2750 rpm with a measured IMEP of 125 PSI per cylinder?
1) 150 IHP
2) 155 IHP
3) 255 IHP
4) 355 IHP
Ref. FAA-12A,Page-33
96. What will be the brake specific fuel consumption if an engine burns 12) gallons per hour while producing 180
BHP?
1) 0.4 lb/hp/hr
2) 0.5lb hp/hr
3) 0.3 lb/hp/hr
4) 0.45 lb/hp/ hr
Ref. FAA-12A,Page-3 & Kroes & Wild Power Plant, Page – 58
97. A stoichio metric mixture is a perfectly balanced fuel/air mixture of:
1) 15 : 1
2) 12 : 1
3) 16 : 1
Ref. Jepssen Power Plant, Page-(1-48)
4) 8 : 1
98. Most modern a/c reciprocating engines have a brake specific fuel consumption which should be lying between the:
1) 0.4 to 0.5 lb/hp/hr
2) 0.4 to 0.6 lb/hp/hr
3) 0.4 to 0.7 lb/hp/hr
4) 0.4 to 0.8 lb/hp/hr
Ref. Kroes & Wild Power Plant, Page – 58
99. When the engine at idling rpm , the MAP gauge may read:
1) 29.92 in Hg
2) Less than 29.92 in Hg
3) Greater than 29.92 in Hg
4) Both 1 & 2 are correct
Ref. Kroes & Wild Power Plant, Page – 55
100. Disadvantages of 2 – stroke engine is / are
1) loss of efficiency 2) improper cooling of engine
Ref. Kroes & Wild Power Plant, Page – 48
3) difficult to lubricate 4) all
101. Every downward stroke of a 2 stroke engine is a
1) intake stroke 2) power stroke 3) exhaust stroke 4) compression stroke
Ref. Kroes & Wild Power Plant, Page – 47,48
102. The expansion of hot gases takes place in the 4) stroke cycle engine during
1) compression stroke 2) exhaust stroke 3) intake stroke 4) power stroke
Ref. Kroes & Wild Power Plant, Page – 43
103. The four stroke cycle, the minimum temperature inside the engine cylinder occurs at the
1) end of intake stroke 2) beginning of exhaust stroke
3) end of power stroke 4) beginning of intake stroke
104. During 7200 rotation of crank-shaft of a 4 stroke-engine, the intake and exhaust valves only open
1) once 2) twice 3) as required in the cycle
4) once and sometimes twice
Ref. Kroes & Wild Power Plant, Page – 33
105. The limit of travel to which the piston moves inside the cylinder away from crankshaft is called
1) TDC
2) BDC
3) stroke
4) Bore
Ref. Kroes & Wild Power Plant, Page – 42
106. In a four stroke cycle engine, the operation are in sequence
1) suction, compression, expansion & exhaust
2) compression, expansion, suction & exhaust
3) suction, exhaust, expansion, compression
Page 10 of 50
4) none
Ref. Kroes & Wild Power Plant, Page – 43
107.Theoretically, a four stroke cycle engine should develop power as compared to two stroke engine is
1) half
2) same
3) double
4) four times
108. The most satisfactory method of classification of piston engine is by:1) Displacement
2) Number of stroke per cycle
3) Cylinder arrangement
4) Cooling method
Ref. Kroes & Wild Power Plant, Page – 6
109. Which of the following is a characteristic of a thrust bearing used in most radial engine
1) double row 2) tapered roller
3) deep groove
4) all
Ref. Kroes & Wild Power Plant, Page – 16
110. The TBO time between overhauls) life of an aero engine varies with the operating condition of
1) engine temperature 2) length of engine operation at high power setting
3) maintenance received
4) all above are correct
Ref. FAA – 12A, Page - 3
111.The number of cylinders composing in one row of a radial engine may be
1) five
2) seven
3) nine 4) either three, five, seven or nine
Ref. FAA – 12A, Page - 5
112. A single row radial engine uses a crankshaft of
1) single throw 2) double throw
3) 4 throw
Ref. FAA – 12A, Page - 12
4) 6 throw
113. The crankshaft journals are supported on the bearings provided on
1) crank-wells
2) nose and rear sections
3) brackets provided from crankcase 4) diameter of cylinder
Ref. FAA – 12A, Page - 10
114. Knuckle pins installed with a loose fit so that they can turn in the master rod flange holes and also turn in
articulated rod housings are called
1) rigid knuckle pins
2) semi floating knuckle pins
3) full floating knuckle pins
4) none of these
Ref. FAA – 12A, Page - 15
115. The function of piston rings is to
1) seal the combustion chamber
2) control the amount of oil on the cylinder wall
3) scrap out the surplus oil from the cylinder wall
4) all of the above are correct
Ref. Kroes & wild Power Plant, page - 26
116. A process where by the nitrogen from anhydrous ammonia gas is forced to penetrate the surface of the steel by
exposing the barrel to ammonia for 40 hours or more at a barrel temperature at about of 975 degree F is called
1) chromium plating 2) carburising
3) cyaniding
4) nitriding
Ref. Kroes & wild Power Plant, page - 28
117. Exhaust valves are generally made of
1) nichrome
2) silchrome
3) chromium-nickel steel
4) nichrome, silchrome or cobalt chromium steel
Ref. FAA – 12A, Page - 20
118. Two springs are used of different diameter, different frequencies and different pitch for valve operation to
1) damp out all spring-surge vibrations
Page 11 of 50
2) reduce the possibility of failure by breakage from heat and metal failure
3) both a and b are correct
4) none of these are correct
Ref. FAA – 12A, Page - 24
119. The advantage of using an extra long skirt cylinder in inverted engines and radial engines is to
1) shorten the length of connecting rod
2) reduce oil consumption
3) prevent hydraulic lock
4) all of these are correct
Ref. Kroes & wild Power Plant, page - 28
120. The external threads of a spark-plug is accommodated in the cylinder head by
1) the threads designed to do so
2) the hellicoil insert which forms internal threads in adopter holes
3) a female plug fitted towards inside of the cylinder head
4) the push-fit inside the cylinder head
Ref. Kroes & wild Power Plant, page - 29
121. The intake pipes are usually sealed by
1) synthetic rubber gaskets
2) metal gaskets
Ref. Kroes & wild Power Plant, page - 29
3) asbestos gaskets
4)paper gaskets
122. A very hard, heat resisting alloy applied at about 1/16” of it on the valve faces to resist wear is called
1) chromating 2) stellite
3) metal plating
4) case hardening
Ref. FAA – 12A, page – 20
123. The distance between the center line of the crankshaft journal and the crankpin is technically defined as
1) throw
2) play
3) dwell
4) stroke
Ref. FAA – 12A, Page – 11
124. The piston and crankshaft are coordinated with the help of a
1) piston pin
2) push rod
3) piston ring
4) connecting rod
Ref. FAA – 12A, Page - 12
125. 1The valve heads, position, spark plug and shape of the piston head affect the shape of
1) cylinder volume
2) swept volume 3) combustion chamber 4) none of these
126. Straight Roller bearings can take :
1) axial load only
3) both radial and axial load
Ref. FAA – 12A, Page - 25
2) radial loads only
4) no load
127. Plain bearings are made of :
1) silver
2) lead
Ref. Kroes & wild Power Plant, page - 16
3) alloy of bronze
128. The dynamic dampers work on the principle of
1) equilibrium theory 2) laws of inertia
3) pendulum theory
Ref. FAA – 12A, Page - 12
4) either of 1, 2 or 3
4) none of the above
129. Dynamic dampers and counter-weights are classified suitably by :
1) their constructional design 2) type of engine they are used
3) their principle of working
4) their mode number
Ref. Kroes & wild Power Plant, page – 19
130. The basic power developing parts of a typical gasoline engine are the:
Page 12 of 50
1) Cylinder, piston & crankshaft
2) Cylinder, connecting rod & crankshaft
3) Cylinder, connecting rod, piston & crankshaft
4) Only cylinder
Ref. FAA – 12A, Page – 05
131. The machined surface on which the cylinders are mounted is called:1) Crankcase pad
2) Cylinder pads
3) Both 1) & 2) are correct
4) Accessories mounting pads
Ref. FAA – 12A, Page - 08
132. Nitrided cylinders are identified by:1) Band of blue paint around their base
2) Certain cooling fins are painted blue
3) Both 1) & 2) are correct
4) Certain fins being painted orange
Ref. Jepssen Power Plant, Page – (1 -19)
133. A mechanism for transmitting the force of the cam to the valve pushrod is called:1) Cam
2) Valve lifter
3) Pushrod
Ref. Kroes & wild Power Plant, page – 32
4) Rocker arm
134. Chromium plated piston ring must never be used in a:1) Nitrided cylinder
2) Chromium plated cylinder
3) Both 1) & 2) are correct
4) Low-carbon - alloy cylinder
Ref. Kroes & wild Power Plant, page – 26 & FAA -12A, page - 462
135. Blow by is evidenced by the:1) Emission of oil vapour from the engine breather
2) Emission of black smoke from the engine breather
3) Both 1) & 2) are correct
4) Emission of red smoke from the engine breather
Ref. Kroes & wild Power Plant, page – 26
136. The metal between the ring grooves are called
1) Groove land
2) Ring Land
3) Ground piston
4) Both 1 & 2 are correct
Ref. Kroes & wild Power Plant, page – 24 & FAA – 12A, page – 15
137. Cylinder heads are usually made of :1) Forged Aluminum alloy
2) Cast Aluminum alloy
3) Both 1 & 2 are correct
4) Forged alloy steel
Ref. FAA – 12A, page - 17
138. Piston pin is made up of:1) High carbon steel 2) Gray cast iron
3) Chrome steel alloy
Ref. FAA – 12A, page – 15
4) Nickel- steel alloy
139. One of the problems associated with nitrided cylinder barrel is:1) Corrosion 2) Strength
3) Friction
4) All of the above are correct
Ref. Jepssen Power plant, page – (1-19)
140. Cam ground piston is one in which:1) Diameter parallel to the piston pin is greater
2) Diameter perpendicular to the piston pin is greater
3) Diameter perpendicular to the piston pin is smaller
4) Diameter parallel to the piston pin is smaller
Ref. Kroes & wild Power Plant, page – 24
Page 13 of 50
141. Articulated rods are attached to the master rod by:1) Wrist pin
2) Gudgeon pin
3) Knuckle pin
Ref. FAA – 12A, page – 13
4) Both 1 & 2 are correct
142. In a ‘V’ type engine the angle between the cylinders bank is available at :1) 90 degree
2) 60 degree
3) 45 degree
4) 90 degree, 60 degree or 45 degree
Ref. Kroes & wild Power Plant, page – 03
143. In one engine specification, the letter ‘D; stands for:1) Dual magneto
2) Direction of rotation
3) Double throw crank-shaft
4) Diameter of cylinder
Ref. Kroes & wild Power Plant, page – 06
144. The alternate name for crank-cheek is:1) Crank-lobe
2) Crank-arm 3) Crank -throw
& wild Power Plant, page – 17
4) Crank - journal
Ref. Kroes
145. The purpose of the counter-weight in crank shaft is to:1) Provide static balance
2) Provide dynamic balanced
3) Provide both static & dynamic balance
4) None of the above is correct
Ref. Kroes & wild Power Plant, page – 17
146. A chamber meant for collecting of carbon deposits, sludge and other foreign materials is called:1) Collector
2) Sump
3) Sediment point
4) Sludge chamber
Ref. Kroes & wild Power Plant, page – 17
147.
Propeller governor is installed in (C & W- 13)
1. nose section
2. power section
3. accessory section
4. either 1 or 3
148. Crank-shafts are generally made of:1) Chrome-vanadium steel ally
2) Chromium-nickel-molybdenum steel
3) Chrome-maganeese steel
4) High-carbon steel alloy
Ref. FAA – 12A, page - 11
149. The type of connecting rod used in ‘V’ type engine is generally of a:1) Plain type
2) Master type
3) Master and articulating rods type
4) Fork and blade type
Ref. FAA – 12A, page – 15
150. using a cam-ground piston in a reciprocating engine helps in design to :1) Reduce piston slap
2) Reduce piston cocking in the cylinder
3) Provide proper piston - cylinder wall fit
4) All above are correct
Ref. Kroes & wild Power Plant, page – 24
151. Piston pins are fitted into the pistons and the connecting rod small end with a clearance generally less than:1) 0.002”
2) 0.001”
3) 0.003”
4) 0.004”
Ref. Kroes & wild Power Plant, page – 28
Page 14 of 50
152. Exhaust pipes are usually sealed by:1) Synthetic rubber - gasket
2) Metal or metal and asbestos gasket
3) Paper gasket
4) Both 1 & 2 are correct
Ref. Kroes & wild Power Plant, page – 29
153. The valve of reciprocating engine are opened by
1) cam mechanism
2) crankshaft mechanism
3) pressure of fuel/air charge
4) all of the above
Ref. Kroes & wild Power Plant, page – 32
154. The circlet, spring rings and aluminium plugs are used in piston pin ends to prevent contact between
1) the piston pin and piston pin boss
2) the piston pin and piston
3) the piston pin and the cylinder walls
4) none of the above
Ref. Kroes & wild Power Plant, page – 27
155. The type of piston ring end gap are :
1) butt joint and step joint
3) butt, step and angle joint
Ref. Kroes & wild Power Plant, page – 26
156. Cross section of oil control rings may be :
1) ventilated type
2) oil wiper type
Ref. Kroes & wild Power Plant, page – 27
157. Cylinder barrel are hardened by
1) tempering 2) forging
Ref. FAA -12A, page - 18
2) only angle joint
4) none of the above
3) uniflow effect
3) casting
158. Indication of worn valve guide
1) low compression
2) high oil consumption
4) all the above
4) nitriding
3) low oil consumption
4) all
159. A/c engines are equipped with propeller shaft which may be :
1) taper type 2) flange type 3) spline type 4) either 1 , 2 or 3
Ref. Kroes & wild Power Plant, page – 20
160. Crankcase for reciprocating engines are generally made of :
1) Al –alloy 2) Mg alloy 3)high grade steel alloy 4) both 1 and 2 are correct
Ref. Kroes & wild Power Plant, page – 13
161. Cam ground pistons
1) compensates for weight
3) better fit at operating temperature
Ref. Kroes & wild Power Plant, page – 24
2) is for better balance
4) is never used
162. Flange type propeller shafts are used with many modern opposed engines with power ratings up to
1) 400 hp
2) 250 hp
3) 450 hp
4) 350 hp
Ref. Kroes & wild Power Plant, page – 21
163. The maximum compression ratio that can be employed for each grade of fuel beyond which detonation pressure
is called as
1) lean best mixture ratio
2) rich mixture ratio
3) ideal compression ratio
4) highest useful compression ratio
Page 15 of 50
Ref. Kroes & wild Power Plant, page – 58
164. The primary concern in establishing the firing order for an opposed engine is to
1) provide for balance
2) keep power impulses as close as possible to obtain greatest mechanical efficiency
3) eliminate vibration
4) both 1 and 3 are correct
Ref. Kroes & wild Power Plant, page – 46 & FAA – 12A, page - 19
165. Piston rings are made of
1) high grade gray cast-iron
3) chrome-manganese steel alloy
Ref. Kroes & wild Power Plant, page – 25
2) high carbon steel alloy
4) aluminium alloy
166.The valve guides and valve seats are provided inside the cylinder head for working of
1)valve stem and valve face respectively
2) valve neck and valve stem
3) valve head and valve face
4) valve stem and valve head
Ref. Jepssen Power Plant, Page (1-22,23)
167. The intake valves are generally made of
1) chromium-nickel steel
2) nichrome 3) silchrome
Ref. FAA -12A, page -20
4) cobalt-chromium steel
168. A bearing designed especially for thrust loads is made with exceptionally deep grooved for the races is
1) Straight roller 2) Tapered roller 3) Ball
4) None
Ref. Kroes & wild Power Plant, page – 16
169. No of teeth on camshaft gear is
1) half of crankshaft gear
2) equal to crankshaft gear
3) double of crankshaft gear
4) none
Ref. Kroes & wild Power Plant, page – 33 & FAA -121) page -23
170. Babbit is soft bearing alloy composed of :
1)tin and copper 2) copper and antimony 3) tin and antimony 4) tin, copper and antimony
Ref. Kroes & wild Power Plant, page – 16
171. Tapered roller bearing withstands
1) radial load only
2) both radial and thrust load 3) thrust load only
Ref. FAA – 12A, page - 25
4) none
172. Bearings which are generally pre-lubricated and sealed are used in
1) Nose section 2) accessory
3) supercharger section
4) all
Ref. Kroes & wild Power Plant, page – 17
173. Weight power ratios for reciprocating engines vary between
1) 0.5 to 1.0 lb/hp 2) 5 to 10 lbs/hp 3) 1.0 to 2.0 lbs/hp 4) None
Ref. Kroes & wild Power Plant, page – 58
174. The bearing used in a/c engines are designed to produce :
1)minimum friction
2)maximum wear resistance
3)smooth working surface
4)all the above
Ref. FAA – 12A, page – 25
175. High engine rpm limit volumetric efficiency because
1) air friction developed
2) the valve may float
3) density decreases
4) both 1 & 2
Ref. Kroes & wild Power Plant, page – 55
Page 16 of 50
176. Mark correct statements
1) take – off power >maxm continuous power
2) take – off power = maxm continuous power
3) take – off power < maxm continuous power
4) none
Ref. Kroes & wild Power Plant, page – 53
177. If swept volume of cylinder is 60 cc and clearance volume is 20 cc ; then compression ratio is
1) 3:1
2) 1:3
3) 4:1
4) 1:4
Ref. FAA – 12A, page – 31
178. Due to detonation, combustion takes place
1) before normal ignition
2) after normal ignition
3) exactly at normal ignition
4) none
Ref. Kroes & wild Power Plant, page – 56
179 After normal combustion, cylinder pressure is maximum
1) just before TDC in compression stroke
2) exactly at TDC
3) just after TDC in power stroke
4) just after BDC in compression stroke
Ref. Kroes & wild Power Plant, page – 43
180. Manifold pressure is dependent on
1) engine speed 2) supercharging 3) both 1 and 2
Ref. FAA – 12A, page – 31
4) none
181. In engine designation, continental O-470, the no 470 indicates
1) weight of engine in lb
2) piston displacement in cubic inch
3) piston displacement in square inch 4) weight of engine in kg
Ref. Kroes & wild Power Plant, page – 06
182. Main journal of crankshaft is surface – hardened by nitriding to the depth of
1) 0.015” to 0.025” 2) 0.005” to 0.007” 3) 0.025” to 0.030” 4) none
Ref. Kroes & wild Power Plant, page – 17
183. How many throws are there in six – cylinder opposed engine
1) 3 2) 6
3) 4
4) 12
Ref. Kroes & wild Power Plant, page – 20
184. Crankpin is usually hollow because
1) it reduces the wt of crankshaft
2) it provides a passage for lubricating oil
3) both 1 & 2 are true
4) as in 3 and it serves as a chamber for collecting carbon deposit
Ref. Kroes & wild Power Plant, page – 17
185. The horse power developed in the cylinders of a reciprocating engine is known as
1) shaft horsepower
2) indicated horsepower
3) brake horsepower
4) friction horsepower
Ref. FAA – 12A, page – 33
186 Part throttle operation
1) increases volumetric efficiency
3) neither increases nor decreases
Ref. FAA – 12A, page – 38
2) decreases volumetric efficiency
4) all are incorrect
187. In which stroke or strokes, both valves on 4-stroke engine is/are open
1) exhaust
2) intake 3) power & intake 4) exhaust & intake
Page 17 of 50
Ref. Kroes & wild Power Plant, page – 44
188. Mode number is used to indicate type of
1) counterweight for a specific engine
3) both 1 and 2
Ref. Kroes & wild Power Plant, page – 19
2) dynamic damper for a specific engine
4) none
189. Opening of intake valve too early may lead to
1) back – firing
2) after firing 3) pre – ignition 4) both 1 and 2 are correct
Ref. Kroes & wild Power Plant, page – 44
190. In 2-stroke engine, check valve controls the flow of air fuel mixture
1) admitting into the crankcase 2) admitting into the cylinder 3) both 1 & 2
Ref. Kroes & wild Power Plant, page – 47
4) none
191. In 2 – stroke piston engine, power impulse occurs for every
1) 3600 revolution of crankshaft
2) 7200 revolution of crankshaft
0
3) 540 revolution of crankshaft
4) 1800 revolution of crankshaft
Ref. Kroes & wild Power Plant, page – 47
192. For constant brake horse power, if RPM of an engine increases; then torque will
1) increase
2) decrease
3) remains same
4) none
Ref. FAA-12A,Page-35
193. Increasing the compression ratio of an engine causes a
1) lower specific fuel consumption
2) as in 1 & greater thermal efficiency
3) higher specific fuel consumption
4) as in 3 & low thermal efficiency
Ref. Kroes & wild Power Plant, page – 58
194. The performance of the engine – propeller combination is determined by
1) indicated horsepower
2) brake horse power
3) friction horse power
4) thrust horse power
Ref. FAA -12A, page – 36
195. Volumetric efficiency depends upon
1) improper valve timing
3) as in 2 & long intake pipes of small diameter
Ref. FAA – 12A, page – 38
2) as in 1 & part throttle operation
4) none
196. After firing is caused by
1) excessive rich mixture 2) excessive lean mixture 3) both lean & rich mixture 4) none
Ref. FAA -12A, page – 445
197. Pistons are classified according to
1) head design 2) length of piston skirt 3) no of rings used 4) weight of piston
Ref. Kroes & wild Power Plant, page – 25
198. Which type of piston ring gap is generally used
1) butt 2) angle
3) step
4) both 2 & 3
Ref. Kroes & wild Power Plant, page – 26
199. Rectangular, wedge & tapered cross-section are used for
1) compression ring 2) oil control ring 3) oil scraper ring 4) oil wiper ring
Ref. Kroes & wild Power Plant, page – 26
200. Which part of valve acts as a pilot to keep the valve head properly aligned
1) valve tip
2) valve stem 3) valve neck
4) valve groove
Page 18 of 50
Ref. FAA – 12A, page – 20
201. In planetary gear reduction system used for propeller, the gear ratio depends upon
1) no of teeth on ring gear
2) no of teeth on sun gear 3) both 1 & 2 4) none
Ref. Jepssen power Plant, page – (1-30)
202. Speed of cam ring depends upon
1) no of lobes
2) no of cylinder
Ref. Jepssen power plant, page – (1-28)
3) both 1 & 2
4)as in 3 and it is used for radial engine
203. Mark the correct statement
1) mechanical efficiency will be more if FHP is more
2) mechanical efficiency will be more if BHP is more
3) BHP will be more if FHP is more
4) BHP will be less if IHP is more
Ref. FAA – 12A, page - 37
204. Mechanical efficiency is
1) the ratio that shows how much of the power development by the expanding gases in the cylinder is actually
delivered to the propeller shaft
2) as in 1 and is a comparison between bhp & fhp
3) always 100% in case of piston engine
4) both 2 & 3 are correct
Ref. FAA-12A, page - 37
205. Opposed engines can be mounted with the cylinders
1) in vertical position
2) in horizontal position
3) either in vertical or horizontal position
4) all are correct
Ref. FAA – 12A, page - 05
206. The cylinder in which the length of stroke is equal to the bore diameter is called :
1) Plain cylinder 2) square cylinder 3) choke bore cylinder 4) cam ground cylinder
Ref. Kroes & wild power plant,page-42
207. Safety circlet groove is designed to prevent the valve :
1) from falling into combustion chamber if valve tip brakes
2) From buckling due to high temperature
3) From damage due to excessive vibration
4) Both 2 and 3 are correct
Ref. Kroes & wild Power Plant, page – 30
208. Intake valve is made of :
1) silchrome
2) nichrome
Ref FAA-12A,page-20
3) Co-Cr- steel 4) Cr-Ni-steel
209. By using filled exhaust valve , the operating temperature of the valve may be reduced as much as :
1) 100 0 F to 200 0 F
2) 3000 F to 4000 F 3) 5000 F to 6000 F 4) 7000 F to 8000 F
Ref FAA-12A,page-20
210.Cylinder head is made of :
1) aluminium alloy
2) pure aluminium
Ref FAA-12A,page-18
3) Cr-Ni-Mo- steel
4) Cr-V- steel
211. In choke bore cylinder :
1)The bore diameter at TDC is greater than that of at BDC
2)Diameter is same from BDC to TDC
3) The bore diameter is reduced at TDC
Page 19 of 50
4) Stroke is equal to bore
Ref. Kroes & wild Power Plant, page – 28
212. Master and articulated connecting rod assembly is found on :
1) V - type engine 2) inline engine 3) radial engine 4) opposed type engine
FAA-12A,page-12
213.Exhaust valve stem is filled with metallic sodium :
1) to make the stem stronger
2) to control the weight of the valve
3) to dissipate the heat rapidly
4) to dissipate the heat slowly
Ref FAA-12A,page-20
214. Compression ring of nitrided barrel is made of :
1) Gray cast iron
2) mild steel with Cr- plating on its working face
3) both 1 and 2 are correct
4) as in 1 and used in high power output engine
Ref FAA-12A,page-16
215. The purpose of dynamic damper is :
1) to provide static balance for the crankshaft
2) to provide dynamic balance for the crankshaft
3) to reduce vibrations caused by crankshaft rotation
4) both 2 and 3 are correct
Ref FAA-12A,page-12
216. Valve springs are made of :
1) Cr-Ni-Mo- steel
2) Cr-Mo- steel
Ref. Kroes & wild Power Plant, page – 32
3) high grade spring steel
4) high grade gray cast iron
217. Radial engine is one in which :
1) cylinders are arranged radially with the crankshaft
2) number of cylinders in each row are always odd
3) as in 1 and number of cylinders in each row are always even
4) both 1 and 2 are correct
Ref FAA-12A,page-5
218. The purpose of cooling fins is to provide:
1) fast cooling by providing the greater contact area to the atmospheric air
2) slow cooling by providing shorter contact area to the atmospheric air
3) more strength to the cylinder head by increasing its weight
4) both 2 and 3 are correct
Ref FAA-12A,page-18
219. Cylinder barrel is made of :
1) Al- alloys
2) Mg- alloys
3) Cr-Ni-Mo- steel
4) As in 3 and it is forged for more strength
Ref Kroes & Wild power plant, page-28
220. The top of the piston is called :
1) ring groove
2) piston head or crown 3) piston pin boss
Ref Kroes & Wild power plant,page-24
4) piston skirt
221. Pistons in modern engines are usually of :
1) flat head type 2) concave head type 3) convex head type 4) truncated cone type
Ref Kroes & Wild power plant,page-25
222. The function of piston rings is :
1) to provide seal between combustion chamber and the crankcase
2) to conduct the heat from piston to cylinder wall
Page 20 of 50
3) to control and regulate the quantity of lubricating oil on the cylinder wall
4) all the above are correct
Ref FAA-12A,page-16
223. The purpose of piston ring end gap is :
1) to reduce the weight of the ring
2) to provide seal expansion chamber and crankcase
3) to allow for heat expansion during engine operation
4) both 1 and 2 are correct
Ref Kroes & Wild power plant,page-26
224. Crankshaft is made of :
1) steel alloy
2) Ni- steel alloy
Ref FAA-12A,page-11
3) Cr-Ni- Mo- steel
4) Hard Al- alloy
225. The link which transmits forces between the piston and the crankshaft is called :
1) camshaft
2) connecting rod
3) push rod
4) rocker arm
Ref FAA-12A,page-12
226. The purpose of counter weight is :
1) is to provide static balance for the crankshaft
2) To provide dynamic balance for the crankshaft
3) both 1 and 2 are correct
4) as in 1 and dynamic balance is achieved by dampers
Ref FAA-12A,page-12
227. Nitrided cylinders are identified by :
1) a band of orange paint around their base
3) a band of blue paint around their base
Ref Jepssen Power Plant,page-(1 - 19)
2) a band of green paint around their base
4) a band of red paint around their base
228. The reason of making crankpin hollow is :
1) to reduce the total weight of the crankshaft
2) to provide a passage for lubricating oil transferring
3) to serve as a sludge chamber
4) all the above are correct
Ref FAA-12A,page-12
229. The portion of the engine in which the power is developed is called :
1) crankcase
2) crankshaft
3) cylinder
4) piston
Ref FAA-12A,page-17
230. Two valve springs are fitted to each valve in order to :
1) prevent resonance
2) as in 1 and prevent valve serge
3) as in 2 and provide fail-safe design
4) as in 3 and dissipate heat more rapidly
Ref FAA-12A,page-24
231. Bore is defined as:
1) The extreme end of the piston movement near the crankshaft axis :
2) The length from TDC to BDC
3) The internal diameter of a cylinder barrel
4) The choke of the cylinder towards TDC
Ref FAA-12A,page-28
232. Compression ratio is the ratio between :
1) The diameter of the cylinder at TDC to the diameter of the cylinder at BDC
2) The volume of the cylinder when the piston is at BDC and the volume when piston is at TDC.
3) The swept volume and clearance volume
Page 21 of 50
4) Both 2 and 3 are correct
Ref FAA-12A,page-31
233. Stroke is :
1) The distance travelled by the piston inside the cylinder barrel from TDC to BDC
2) As in 1 and one stroke is equal to 1800 of crankshaft rotation
3) As in 2 and one stroke is equal to 900 of crankshaft rotation
4) The internal diameter of a cylinder barrel
Ref FAA-12A,page-28
234. Valve overlap provides :
1) Better mechanical efficiency
3) Less friction
Ref Kroes & Wild power plant,page-44
2) better volumetric efficiency
4) Both 2 and 3 are correct
235. Friction horse power is equal to :
1) Indicated horsepower minus trust horsepower
2) Indicated horsepower plus thrust horsepower
3) Indicated horsepower plus brake horsepower
4) Indicated horsepower minus brake horsepower
Ref FAA-12A,page-35
236. Mechanical efficiency is the ratio of :
1) Brake horsepower to the indicated horsepower
2) Brake horsepower to the friction horsepower
3) Brake horsepower to the thrust horsepower
4) Indicated horse power to the friction horsepower
Ref FAA-12A,page-37
237. Thermal efficiency is the ratio of :
1) The heat energy converted into useful work to the total heat energy contained in the fuel consumed by the engine
2) As in 1 and higher thermal efficiency, lower is the specific fuel consumption
3) As in 1 and higher the thermal efficiency higher is the specific fuel consumption
4) None of the above
Ref FAA-12A,page-37
238. Thermal efficiency of an engine is increased by:
1) Increasing compression ratio
2) decreasing compression ratio
3) as in 1 and by ignition advance
4) as in 2 and by using proper grade of fuel
Ref FAA-12A,page-37
239. The face angle of intake valve is :
1) 300
2) 450
Ref FAA-12A,page-20
3) 750
4) 900
240. The direction of camshaft rotation is :
1) The same as the crankshaft and rotated at the same speed as the crankshaft
2) Opposite to the crankshaft rotation and rotated at the half speed of the crankshaft
3) Clockwise and rotation is more than crankshaft
4) As in 3 but rotation is less than crankshaft
Ref FAA-12A,page-23
241. In four stroke engine the ottocycle is completed in :
1) 3600 rotation of crankshaft
2) 3600 rotation of cam shaft
0
3) 720 rotation of crankshaft
4) Both 2 and 3 are correct
Ref FAA-12A,page-28
Page 22 of 50
242. Ignition occurs at 280 before TDC on a certain four stroke cycle engine and the intake valve at 150 before TDC How many
degrees the crankshaft will travel after ignition does the intake valve open ?
1) 707 0
2) 3730
3) 3470
4) 273 0
Ref Kroes & Wild Power Plant, Page - 45
243. BHP is calculated by the formula :
1) BHP = ( x torque x 33000/2) x rpm
3) BHP = (2 x torque x RPM)/33000
Ref FAA-12A,page-35
2) BHP = ( 2 x33000/torque) x RPM
4) BHP = (RPM x 33000/2) x torque
244. Blue smoke being emitted from the engine breather indicates :
1) valve blow-by
2) piston blow- by 3) worn piston rings
Ref Kroes & Wild power plant,page-26
4) both 2 and 3 are correct
245. Intake port of the cylinder is identified by :
1) presence of cooling fins around intake port
2) absence of cooling fins around intake port
3) absence of cooling fins around both intake and exhaust ports
4) all above are wrong
Ref Kroes & Wild power plant,page-29
246. Extended skirt of the cylinder barrel decreases the possibility of :
1) vapour lock
2) hydraulic lock
3) as in 1 and which results from oil collected in the cylinder head
4) as in 2 and which result from oil collected in the cylinder head
Ref Kroes & Wild power plant,page-28
247. Nonferrous metal piston plugs are used with :
1) semi-floating piston pin
2) full-floating piston pin
3) as in 1 and the plug is made of aluminium alloy
4) as in 2 and the plug is made of aluminium alloy
Ref Kroes & Wild power plant,page-27
248. Piston is made of :
1) aluminium alloy
3) forged Nickel-Steel alloy
Ref FAA-12A,page-15
2) Ni-Cr-Mo steel
4) High carbon steel
249. Manifold pressure of non-supercharge engine is :
1) equal to the pressure inside the cylinder in power stroke
2) ambient pressure
3) 14.7 psi at any conduction
4) as in 2 and 14.7 psi at sea level condition
Ref FAA-12A,page-31
250. Rocker arm is mounted on the cylinder head which transmits the forces :
1) from the valve tip to the push rod to open the valve
2) from the push rod to the valve tip to open the valve
3) from the push rod to the valve tip to close the valve
4) as in 1 and valve closes the passage due to the spring tension when the force is removed by rocker arm
Ref FAA-12A,page-24
251. The function of valve spring is :
1) to close the valve and hold it securely on the valve seat
2) to open the valve which is necessary to provide passage for fuel air mixture
3) to open the valve which is necessary to provide passage for exhaust
Page 23 of 50
4) both 2) and 3) are correct
Ref FAA-12A,page-24
252. Firing order of a 9- cylinder radial engine is :
1) 1-2-3-4-5-6-7-8-9
2) 1-3-2-4-5-7-6-8-9
3) 1-3-5-7-9-2-4-6-8
4) 1-5-7-9-3-6-2-4-8
Ref FAA-12A,page-19
253. Brake horsepower is :
1) the power developed by the engine delivered to the crankshaft for useful work
2) equal to the indicated horsepower plus friction horsepower
3) equal to the indicated horsepower minus friction horsepower
4) both 1 and 3 are correct
Ref FAA-12A,page-34
254. In effective crank angle is the period in crankshaft degree when :
1) both valves remain in opened condition
2) both valves remain in closed condition
3) the piston moves at faster speed at TDC than BDC
4) the piston has a little or no movement
Ref Kroes & Wild power plant,page-199
255. Firing order of 14) cylinder radial engine :
1) 1-3-5-7-9-11-13-2-4-6-8-10-12-14
2) 1-2-3-4-5-6-7-8-9-10-11-12-13-14
3) 1-9-7-5-11-13-1-14-12-10-8-6-4-2
4) 1-10-5-14-9-4-13-8-3-12-7-2-11-6
Ref FAA-12A,page-19
256. Piston displacement is :
1) the distance of the piston movement from BDC to TDC and vice-versa
2) the space of the volume swept by the piston from TDC to BDC and vice-versa
3) the ratio of cylinder volume when the piston is at BDC to that of at TDC
4) the space above the piston when it is at the TDC
Ref FAA-12A,page-30
257. Crankshaft axis is defined as an imaginary line passing :
1) perpendicular to the crankpin axis
3) perpendicular through crankshaft main journal
Ref. Kroes & wild Power Plant, page – 17
2) through crankshaft main journals
4) through camshaft journals
258. How many degree the crankshaft will rotate in one four stroke cycle, when both intake and exhaust valves are closed; if i
valve closes 450 after BDC in compression stroke and exhaust valve opens 700 before BDC in power stroke ?
1) 6100
2) 2900
3) 2450
4) 250
Ref. Kroes & wild Power Plant, page – 44 & 45
259. Where is the no. 1 cylinder on a six cylinder Lycoming engine (Page no. 17, Dale crane)
1) First cylinder on right side
2) First cylinder on left side
3) last cylinder on left side
4) last cylinder on right side
260. Which of the following do not affect volumetric efficiency (Page no.55, Kroes wild)
1) high carburetor air temperature
2) sharp rise in induction system
3) full throttle operation
4) improper valve timing
Page 24 of 50
261. The cylinder heads of radial engines are provided with fitting to accommodate rocker-box, inter cylinder drains
for (Page no.36, Kroes Wild)
1) even pressure among cylinder head
2) even oil flow among cylinder head
3) adequate lubrication for all rocker boxes
4) all of the above
262. Where is the piston located when the intake valves opens? (Pg – 1-35, Jeppesen Powerplant)
1).
Before the piston reaches the top of the exhaust stroke
2).
Before the piston reaches the bottom of the intake stroke
3).
Before the piston reaches the top of the compression stroke
4).
Before the piston reaches the bottom of the power stroke
263. The time valves are off their seat is called (Page no.46, Kroes wild)
1) opening time 2) duration 3) Induction 4) none
264. The wedge shape pistons rings are fitted to obtain : (Page no.27, Kroes wild)
1) sliding action 2)self cleaning action 3)both 1) and 2) are correct 4)none
265. In radial engine, the valve actuating device is : (Page no.32, Kroes wild)
1) can shaft 2) cam plate or cam ring 3) cam box 4) any
266. Using the following information, determine how many degree crankshaft will rotate with both intake a exhaust
valves seated: (Page 46, Kroes wild)
I O 150 BTDC EO 700 BBDC IC 450 ABDC EC 100 ATDC
1) 290 degree
2) 245 degree
3) 373) degree
4) 25 degree
267. Which statement is correct regarding a four stroke cycle a/c engine? (Page – 45, Kroes wild)
1) The intake valve closes on the compression stroke
2) The exhaust valve opens on the exhaust stroke
3) The intake valve closes on the intake stroke
4) The exhaust valve closes on the exhaust stroke
268 If the exhaust valve of a four - stroke cycle engine is closed and the intake valve is just closing, the piston is on
the: (Page – 43, Kroes wild)
1) Intake stroke
2) Power stroke
3) Compression stroke
4) Exhaust stroke
269. When does the ignition event take place in a four-stroke cycle a/c reciprocating engine? (Page – 43, Kroes wild)
1) Before the piston reaches TDC on compression stroke
2) After the piston reaches TDC on power stroke
3) After the piston reaches TDC on compression stroke
4) Just after the piston reaches TDC on compression stroke
270. If the Intake valve closes 60 degree ABC on compression stroke then the valve lag is: (Page – 45, Kroes wild)
1) 240 degree 2) 120 degree
3) 60 degree 4) 135 degree
271. What will be the thermal efficiency of a piston engine that produces 150 BHP while burning 8 gallons of
aviation gasoline per hour? (Page 54, Kroes wild)
1) 19.8%
2) 29.8%
3) 39.8%
4) 49.8%
272. In a valve timing diagram, the intake valve opens 150 BTC during exhaust stroke and closes 600 ABC during
compression stroke, then the total period the valve remains opened in a cycle is (Page – 45, Kroes wild)
a 2300
b 2350
0
c 255
d 2600
Page 25 of 50
273. How much aviation gasoline will an engine burn if it produces 180 brake horsepower and has a brake specific
fuel consumption of 0.47? (Pg -1-48, Jeppesen powerplant)
1)
84.6 gallons per hour
2)
14.1 gallons per hour
3)
14.1 pounds per hour
4)
42.3 pounds per hour
274. The total piston displacement of an engine is the total volume displaced by all the pistons during: (Page -50,
Kroes wild)
1) Half of the revolution of the crankshaft
2) One revolution of the crankshaft
3) Two revolutions of the crankshaft
4) One & half revolution of the crankshaft
275. What will be the engine piston displacement of six-cylinder horizontal opposed engine that has a bore of 4)
inches & a stroke of 3) inches? (Page -50, Kroes wild)
1) 540 cubic inches 2) 526 cubic inches
3) 326 cubic inches 4) 226 cubic inches
276. What will be the brake specific fuel consumption if an engine burns 12) gallons per hour while producing 180
BHP? (Page 58, FAA – 12 A)
1) 04) lb/hp/hr
2) 05lb hp/hr
3) 03) lb/hp/hr
4) 045 lb/hp/ hr
277. What type of crankshaft is used by a six cylinder horizontally inline engine? (Page – 18, Dale warne)
1)
45 degree
2)
60 degree
3)
120 degree
4)
180 degree
278.
1)
2)
3)
4)
What is the purpose of a quill shaft in some of the modern engine crankshafts? (Pg – 30, Dale crane)
It increases the torsional strength of the crankshaft
It absorbs some of the torsional vibrations that are transmitted into the crankshaft
It aid in dynamically balancing the crankshaft
It is a special extension shaft used to drive some of the accessories
279. Which of the following is a characteristic of a thrust bearing used in most radial engine (Page 16, Kroes wild)
1)
double row
2)
tapered roller
3)
deep groove
4)
all
280. The TBO (time between overhauls) life of an aero engine varies with the operating condition of (Page 3, FAA –
12A)
1)
engine temperature
2)
length of engine operation at high power setting
3)
maintenance received
4)
all above are correct
281. The number of cylinders composing in one row of a radial engine may be (Page 5, FAA – 12A)
1)
five
2)
seven
3)
nine
4)
either three, five, seven or nine
282. A single row radial engine uses a crankshaft of (Page 19, Kroes wild)
1)
single throw
2)
double throw
3)
throw
4)
6 throw
283. What drives a turbo charger compressor? (Pg – 5 – 8, Jeppesen powerplant)
Page 26 of 50
1)
2)
3)
4)
An exhaust gas driven turbine
A hydraulic motor driven by engine oil pressure
Exhaust gases impinging on the compressor scroll
It is gear driven from an accessory drive of the engine
284. The external threads of a spark-plug is accommodated in the cylinder head by (Page – 18, FAA – 12A)
1)
the threads designed to do so
2)
the hellicoil insert which forms internal threads in adopter holes
3)
a female plug fitted towards inside of the cylinder head
4)
the push-fit inside the cylinder head
285. Nitrided cylinders are identified by:1)
Band of blue paint around their base on
2)
Certain f being painted blue
3)
Both 1) & 2) are correct
4)
Certain flues being painted orange
286. Using a cam-ground piston in a reciprocating engine helps in design to :- (Page - 24, Kroes wild)
1)
Reduce piston slap
2)
Reduce piston cocking in the cylinder
3)
Provide proper piston - cylinder wall fit
4)
All above are correct
287. Piston pins are fitted into the pistons and the connecting rod small end with a clearance generally less than:Page - 28, Kroes wild)
1)
0002”
2) 0001”
3)
0003”
4) 0004”
288. The type of piston ring joints are : (Page - 26, Kroes wild)
1)
butt joint and step joint
2) only angle joint
3)
butt, step and angle joint
4) none of the above
289.
1)
2)
3)
4)
The primary concern in establishing the firing order for an opposed engine is to (Page - 46, Kroes wild)
provide for balance
keep power impulses as close as possible to obtain greatest mechanical efficiency
eliminate vibration
both a and c
290. What is the brake horsepower developed by a four cylinder engine with a four inch bore, a four inch stroke, a
BMEP of 125 psi and turning at 2300 RPM? (Pg 1- 41, Jeppesen powerplant)
1).
146 horsepower
2).
723 horsepower
3).
73 horsepower
4).
876 horsepower
291. The valve guides and valve seats are provided inside the cylinder head for working of (Page 31, Kroes wild)
1)
valve stem and valve face respectively
2) valve neck and valve stem
3)
valve head and valve face
4) valve stem and valve head
292 Main journal of crankshaft is surface – hardened by nitriding to the depth of (Page -17, Kroes wild)
1)
0015” to 0025” 2) 0005” to 0007” 3) 0025” to 0030” 4) none
293 How many throws are there in six – cylinder opposed engine (Page -20, Kroes wild)
1) 3 2) 6
3) 4) 4) 12
294 Increasing the compression ratio of an engine causes a (Page 58, Kroes wild)
1)
lower specific fuel consumption
2)
as in 1) & greater thermal efficiency
3)
higher specific fuel consumption
4)
as in 3) & low thermal efficiency
Page 27 of 50
295 Which type of piston ring joint is generally used (Page 26, Kroes wild)
1)
butt
2) angle
3) step
4) both 2) & 3
296 Speed of cam ring depends upon (Page 35, Kroes wild)
1)
no of lobes
2)
no of cylinder
3)
both 1) & 2)
4)
as in 1) and it is used for radial engine
297 Mark the correct statement (Page 54, Kroes wild)
1)
mechanical efficiency will be more if FHP is more
2)
mechanical efficiency will be more if BHP is more
3)
BHP will be more if FHP is more
4) BHP will be less if IHP is more
298 Mechanical efficiency is (Page 54, Kroes wild)
1) the ratio that shows how much of the power development by the expanding gases in the cylinder is actually
delivered to the propeller shaft
2) as in 1) and is a comparison between bhp & fhp
3) always 100% in case of piston engine
4) both 2) & 3) are correct
299 Opposed engines can be mounted with the cylinders (Page -4, Kroes wild)
1)
in vertical position
2) in horizontal position
3)
either in vertical or horizontal position
4) all are correct
300
1).
2)
3)
4)
Speed of the cam plate having two cam lobes is (Pg 1-28, Jeppesen powerplant)
1/3 of the crankshaft speed
¼ of the crankshaft speed
½ of the crankshaft speed
same as the crankshaft speed
301 Exhaust valve stem is filled with metallic sodium :
1)
to make the stem stronger
2) to control the weight of the valve
3)
to dissipate the heat rapidly
4) to dissipate the heat slowly
Ref FAA-12A,page-20)
302 Compression ring of nitrided barrel is made of :
1.Gray cast iron
2) mild steel with Cr- plating on its working face
3) both 1) and 2) are correct
4) as in 1) and used in high power output engine
Ref FAA-12A,page-16)
303 The purpose of cooling fins is to provide:
1)
fast cooling by providing the greater contact area to the atmospheric air
2)
slow cooling by providing shorter contact area to the atmospheric air
3)
more strength to the cylinder head by increasing its weight
4)
both 2) and 3) are correct
Ref FAA-12A,page-18)
304 Friction horse power is equal to :
1)
Indicated horsepower minus trust horsepower
2)
Indicated horsepower plus thrust horsepower
3)
Indicated horsepower plus brake horsepower
4)
Indicated horsepower minus brake horsepower
Ref FAA-12A,page-35)
305 Thermal efficiency is the ratio of :
1) The heat energy converted into useful work to the total heat energy contained in the fuel consumed by the engine
2) As in 1) and higher thermal efficiency, lower is the specific fuel consumption
Page 28 of 50
3) As in 1) and higher the thermal efficiency higher is the specific fuel consumption
4) None of the above
Ref FAA-12A,page-37)
306 Thermal efficiency of an engine is increased by:
1) Increasing compression ratio
2) decreasing compression ratio
3) as in 1) and by ignition advance 4) as in 2) and by using proper grade of fuel
Ref FAA-12A,page-20)
307. Intake port of the cylinder is identified by : (Page 29, Krores wild)
1)
presence of cooling fins around intake port
2) absence of cooling fins around intake port
3)
absence of cooling fins around both intake and exhaust ports
4) all above are wrong
Ref A/c power plant,page-29)
308
Which of the following is a characteristic of a thrust bearing used in most radial pressure? (Pg – 1-12,
Jeppessen Powerplant)
1).
Tapered roller
2).
Double row ball
3)
Deep groove ball
309
The operating temperature value clearance of a radial engine as compared to cold value clearance is (Pg – 128, Jeppessen Powerplant)
1).
greater
2).
less
3).
the same
310.
1).
Master rod bearings are generally of what type? (Pg – 1-13, Jeppessen Powerplant)
plain
2)
roller
3).
ball
311
1).
Which tool is generally used to measure the crankshaft rotation in degrees?
Dial indicator
2).
Timing disk 3).
prop. Protactor
4).
DT1
312
If an engine with a stroke of 6” is operated at 2000 rpm, the piston movement within the cylinder will be(Pg –
1-37, Jeppessen Powerplant)
1).
at maximum velocity around TDC
2).
at maximum velocity around BDC
3).
constant during entire 3600 of crankshaft travel
4).
at maximum velocity 900 after TDC
313
1).
2).
3).
4).
Chrome plated cylinder barrels are identified by (Pg – 1-19, Jeppessen Powerplant)
band of orange paint around the cylinder base
letter C on the cylinder base
band of blue paint around the cooling fins
band of blue paint around the cylinder base
314
On which part of the cylinder walls of a normally operated engine will the greatest amount of wear occur? (Pg
– 1-19, Jeppessen Powerplant)
1).
Near the center of the cylinder where piston velocity is greatest
2).
near the top of the cylinder
3).
wear is normally evenly distributed
315
Valve overlap is defined as the number of degrees of crankshaft travel (Pg – 1-36, Jeppessen Powerplant)
1).
during which both valves are off their seats
2). between the closing of IV and opening of EV
3). between the opening of IV and closing of EV
4). during which both valves are on their seats
316
If the hot clearance is used to set the valves when the engine is cold, what will occur during operation of the
engine? (Pg – 1-29, Jeppessen Powerplant)
1).
the values will open early and close early
2). the values will open late and close early
3). the values will open early and close late
Page 29 of 50
317
The arrangement of engine where cylinders are arranged around the periphery of the crankcase is known as
(Pg 1-2, Jeppessen powerplant)
1).
radial engine
2).
Inline engine
3).
opposed engine
4).
fan-type engine
318
A hissing sound from the exhaust stacks when the propeller is being pulled through manually indicates (Pg –
1-16, Jeppessen Powerplant)
1).
a cracked exhaust stack
2).
exhaust valve blowby
3).
backfiring
4).
worn piston wings
319
1).
2).
3).
4).
In GTS10 – 520- F engine, the letter F indicates that (Pg – 1-32, Jeppessen Powerplant)
engine is fitted with fuel injector
engine is an F model
F – type crankshaft is fitted in engine
None of the above
320
1).
2).
3).
4).
Where is the number -1 cylinder on a 14-cylinder radial engine? (Pg 1-21, Jeppessen Powerplant)
bottom cylinder in rear row
top cylinder in front row
bottom cylinder in front row
top cylinder in rear row
321
1).
2).
3).
4).
Mark the correct statement (Pg – 1-53, Jeppessen Powerplant)
Diesel engines have lower bsfc than otto cycle engines.
Diesel engines are more durable than otto cycle engines
Detonation is not a problem with diesel engines
All of the above are correct
322.
1).
2).
3).
The valve guides are installed (Pg -31, Kroes wild)
by heating guide and chilled the cylinder head
by heating the cylinder head
by screwed the guide in the cylinder head
323.
1).
2).
3).
4).
The minimum pressure is developed within the cylinder(pg – 53, Kroes wild)
At the starting of intake stroke
At the end of exhaust stroke
At the end of intake stroke
At the starting of exhaust stroke
324.
1).
2).
3).
4).
Value duration is determined by the (pg – 46, Kroes wild)
spacing of the lobes
contour of the lobes
speed and direction of the cam
all of the above
325.
1).
2).
3).
4).
How many lobes are there in the camkshaft of six-cylinder opposed engine (pg – 33, Kroes wild)
nine
twelve
six
four
326.
1).
2).
3).
Ability of engine to operate for long periods of time between overhaul is called (pg – 4, FAA-12A)
reliability
durability
flexibility
Page 30 of 50
4).
compactness
327.
1).
2).
3).
4).
The firing order of 6 – cylinder opposed engine is (pg – 46, Kroes wild)
1-3-2-4-5-6
1-4-5-2-3-6
1-5-3-2-4-6
1-4-3-6-4-2
328.
1).
2).
3).
In GT10-320-C engine, the letter G indicates (Pg 1-32, Jeppesen powerplant)
geared nose section
ground adjustable propeller
gear –type pump
329.
1).
2).
3).
4).
Ability of engine to consistently do, what the manufacturer say, it will is called (Page 11, Dale crane)
Reliability
Durability
Flexibility
Compactness
330.
1).
2).
3).
4).
Excessive valve clearance in otto cycle engine (Pg 1 -29, Jeppessen Powerplant)
increases v/v overlap
decreases v/v overlap
has no effect on v/v overlap
increases v/v service a/c
331.
1).
2).
3).
4).
Ninety degree crankshaft is used in (pg – 20, Dale crane)
V -12 type engine
six cylinder in – line engine
eight cylinder opposed engine
18-cylinder radial engine
332.
1).
2).
3).
4).
The engine which carries its oil in a sump which is an integral part of the engine is called (Pg 16, Dale crane)
wet sump engine
dry sump engine
x –type engine
fan type engine
333.
1).
Which is the heaviest single part of an otto cycle engine (Pg – 27, Dale crane)
camshaft
2).
crankshaft
3).
crankcase
4).
cylinder
334.
How many degrees apart are the throws of the crankshaft of a six cylinder horizontally opposed aircraft
engine? (Pg – 28, Dale crane)
1).
Ninety degree
2).
sixty degree
3).
forty five degree
4).
one hundred and twenty degree
335.
1).
3)
In two stroke engine rotation of crank shaft (C & W- 47)
one
2).
two
three
4).
four
336.
1).
3).
In two stroke engine number of event is (C & W- 43)
two
2). three
four
4). five
337. Propulsive force in an a/c is provided by (12A/CH-1/P-I)
1) fuselage
2) landing gear
3) control surfaces
4) engine
Page 31 of 50
338. In an engine cycle, heat energy is released at a point in cycle where, pressure of combustible mixture is
(12A/CH-1/P-I)
1) less than atmosphere pressure
2) more than atmosphere pressure
3) equal to atmosphere pressure
4) doesn’t depends on pressure
339. Means of compressing the working fluid in Basic Reciprocating engine is (12A/CH-1/P-I)
1) compression due to combustion
2) turbine driven compressor
3) reciprocating action of pistons
4) none
340. Jet engines accelerates a (12A/CH-1/P-I)
1)
large mass of air through small velocity change
2)
small mass of air through large velocity change
3)
equal mass of air through equal velocity change
4)
it depends on the temperature of air
341. An a/c engine must have (12A/CH-1/P-2)
1)
high weight to horse power ratio
2)
low weight to horse power ratio
3)
medium weight to horse power ratio
4)
none
342. An a/c engine must have (12A/CH-1/P-2)
1)
2)
high power output
3)
Should be compact
4)
Be vibration free
5)
All
343. Fuel metering devices are needed to (12A/CH-1/P-2)
1)
deliver fuel in correct proportion to air
2)
store fuel in correct amount
3)
pressurize fuel to required pressure
4)
as in 1 and regardless of attitude, altitude & atmospheric condition
344. The useful output of an a/c power plant is (12A/CH-1/P-2)
1)
2)
lift
3)
weight
4)
thrust
5)
drag
345. Reciprocating engines are generally rated in: (12A/CH-1/P-2)
1)
t.hp
2)
s.hp
3)
Bhp
4)
as in 3, depends on fuel used
346. Gas turbine engines are rated in : (12A/CH-1/P-2)
1)
2)
Bhp
3)
s.hp
4)
pounds
5)
pounds of thrust
Page 32 of 50
347. Generally the a/c is at full power output during (12A/CH-1/P-2)
1)
2)
take off
3)
Climbing
4)
Cruising
5)
Landing
348. The basic parameter for describing the fuel economy of a/c engines is : (12A/CH-1/P-3)
1)
2) average fuel consumption
3) Specific fuel consumption
4) Mean fuel consumption
5) Total fuel consumption
349. At high velocity which of the following engine is less efficient (12A/CH-1/P-3)
1)
2) reciprocating engine
3) Jet engine
4) Ram jet
5) Recket
350. When economy is required at low speed which of the following engines are used : (12A/CH-1/P-4)
1)
2) jet engine
3) Reciprocating engine
4) Turbo prop engines
5) rockets
351 For a/c whose crusing speed will not exceed 250 mph. which the following engine should be used
(12A/CH-1/P-4)
1)
2) 1)ram jet
3) Pulse jet
4) Piston engine
5) Rocket
352. In air cooled engines heat is transferred from the cylinder to air by (12A/CH-1/P-4)
1) conduction
2) convection
3) radiation
4) none
353. In line inverted engines have an advantage of (12A/CH-1/P-5)
1) shorter L/G required
2) Greater pitot visibility
3) Both (1) & (2)
4) As in (2) & better cooling than inline upright engine
354. The horizontally opposed engines have ----- weight to horse power ratio (12A/CH-1/P-5)
1)
2) high
3) Average
4) Low
5) As in (2) & depends on no of cylinder
355. The no. of cylinders in one row of radial engines is always in (12A/CH-1/P-5)
Page 33 of 50
1)
2) even numbers
3) odd numbers
4) depends on power required
5) depends on fuel efficiency
356. Purpose of crankcase (12A/CH-1/P-6)
1) it contains bearing on which crankshaft is supported
2) It provides a tight enclosure for lubricating oil
3) It provides attachment for cylinders
4) All of the above
357. Different sections (in sequence) of radial engines are : (12A/CH-1/P-7)
1)
2) power, supercharger, nose, accessory
3) Power, nose, supercharger, accessory
4) Nose, power, supercharger, accessory
5) Nose, power, accessory, supercharger
358. The backbone of the reciprocating engine is (12A/CH-1/P-11)
1)
2) propellor
3) cylinder
4) piston
5) crankshaft
359. Crankshaft are generally made up of (12A/CH-1/P-11)
1) steel alloy
2) aluminium alloy
3) chrome nickel steel
4) chrome nickel molybdenum steel
360. Crankshaft consists of (12A/CH-1/P-11)
1)
2) journal & crank pin
3) Crankpin & crank check
4) Journal, crankpin & crank check
5) Journal, shaft & crankpin
361. In the crankshaft, crankpin is the section which is attached to (12A/CH-1/P-11)
1)
2) piston
3) Cylinder
4) Connecting rod
5) Bearing surface
362. Type of crankshaft and no. of crankpins on a crankshaft depends (12A/CH-1/P-12)
1)
2) arrangement of cylinders
3) type of propeller used
4) type of ignition system used
5) power out put of engine
363. The position of the cranks on the crankshaft in relation to the other cranks of the some shaft is
expressed in (12A/CH-1/P-12)
1)
2) centimeters
3) Inches
Page 34 of 50
4) Millimeters
5) Degrees
364. The simplest crankshaft is (12A/CH-1/P-12)
1) single throw /180 degree type
2) double throw /360 degree type
3) single throw / 360 degree type
4) double throw /180 degree type
365. Excessive vibration in an engine results in (12A/CH-1/P-12)
1) fatigue failure of metal structure
2) Corrosion of the internal parts
3) Rapid wearing of the moving parts
4) Both (1) and (3)
366. When checking the crankshaft for static balance it should be placed on (12A/CH-1/P-12)
1)
2) blade edge
3) needle point
4) pin point
5) all of the above
367. Piston is usually drilled at the oil control ring groove (12A/CH-1/P-15)
1) for cooling of piston
2) to allow driping out of surplus oil in to the crankcase
3) to reduce the weight of piston
4) as in (1) for allowing partial leakage.
368. The piston pin joins (12A/CH-1/P-15)
1)
2) piston rings to the pistons
3) Piston to the cylinder
4) Piston to the connecting rod
5) Both (1) & (2)
369. Compression rings are generally made of (12A/CH-1/P-16)
1)
2) chrome plated mild steel
3) chrome plated speing steel
4) nickel plated mild steel
5) nickel plated spring steel
370. No. of the piston rings used is determined by (12A/CH-1/P-17)
1)
2) type of engine
3) Design
4) Both (1) & (2)
5) None
371. The cross section for compression ring is (12A/CH-1/P-17)
1)
2) rectangular or wedge
3) triangular or wedge
4) square or wedge
5) as in (3) with a tapered foce
372. Oil control rings (12A/CH-1/P-17)
1) prevent leakage of gases from the combustion chamber
2) Regulates thickness of oil film on cylinder wall
Page 35 of 50
3) Scraps excess oil from the cylinder wall
4) All the above
373. The purpose of cylinder head is (12A/CH-1/P-18)
1) to store air-fuel mixture
2) to provide space for combustion of air-fuel mixture
3) both (1) & (2)
4) only (2) is correct
374. Air cooling of cylinders can be increased by (12A/CH-1/P-18)
1) increasing the thickness and reducing the depth of fin
2) Reducing the thickness and increasing the depth of fin
3) By reducing the area of cylinder
4) Both (2) & (3) are correct
375. The valves used in a/c engines are (12A/CH-1/P-20)
1)
2) split type valve
3) conventional poppet type valve
4) elongated type valve
5) quick opening valve
376. The valves in the cylinders of an a/c engines are subjected to (12A/CH-1/P-20)
1) high temperature
2) Corrosion
3) Operating stresses
4) All of the above
377. The
is a part that forms the junction between head and the stem of the valve (Fill in
the blank) (12A/CH-1/P-20)
1) tip
2) stem
3) neck
4) head
378. The machined groove on the stem near the tip receives (12A/CH-1/P-20)
1)
2) split ring stem keys
3) Solid ring stem keys
4) Double ring stem keys
5) All are correct
379. Split ring stem keys holds the (12A/CH-1/P-20)
1)
2) rocker arms
3) push rod
4) valve spring retainer
5) valves
380. For the proper operation of reciprocating engines, each valve (12A/CH-1/P-21)
1)
2) must open at the proper time
3) must stay open for required length of time
4) must close at the proper time
5) all the above
381. Valve duration is (12A/CH-1/P-21)
1) total life the valve is in luse
Page 36 of 50
2) Length of time the valve is kept open
3) Duration of valve failure
4) duration, the valve is in defeated condition
382. Valve lift means (12A/CH-1/P-21)
1) amount of lift produced, due to pressure difference
2) Distance the valve is off its seat
3) Amount of up ward travel of valve
4) As in (2) depends on oil pressure
383. The portion of lobes that gently starts the valve operating mechanism(12A/CH-1/P-21)
1)
2) track
3) Map
4) Path
5) Ramp
384. In a single row radial engine, cam ring is usually located between (12A/CH-1/P-22)
1) reduction gear section & punch section
2) Nose section and power section
3) Reduction gear section & front of power section
4) Reduction gear section & aft of power section
385. In double row radial engine the second cam ring is usually installed between (12A/CH-1/P-22)
1) Propeller reduction gear & front of power section
2) Power section & accessory section
3) Power section & blower section
4) Rear end of power section & front of supercharger section
386. The cam ring is mounted --- with the crankshaft (12A/CH-1/P-22)
1)
2) concentrically
3) Accentrically
4) Either (1) or (2)
5) None
387. The timing of the valve event is determined by (12A/CH-1/P-22)
1) spacing of lobes
2) Speed of cam shaft w.r.t. crankshaft
3) Direction of rotation of cam shaft w.r.t. crankshaft
4) All of above
388. The valve mechanism of an opposed engine is operated by (12A/CH-1/P-23)
1)
2) crankshaft
3) Crankpin
4) Cam shaft
389. The camshaft always rotates at ----- the crankshaft speed (12A/CH-1/P-23)
1)
2) twice
3) One & one half times
4) Equal
5) One-half times
390. The force of the tappets is transformed to rocker arm through (12A/CH-1/P-23)
1)
2) push pull rod
Page 37 of 50
3) Cam shaft
4) Push rod
391. A hole is drilled through the tappet (12A/CH-1/P-23)
1)
2) to reduce weight
3) To pass lubricating oil
4) As in (2) for the lubrication of cam shaft
5) None
392. Hydraulic tappets are also termed as (12A/CH-1/P-23)
1)
2) zero-lifter
3) Valve - lifter
4) Zero-lash valve lifter
5) Back-lash value lifter
393. Rocker arm assemblies are supported by (12A/CH-1/P-24)
1)
2) Plain bearing
3) Roller bearing
4) Ball bearing
5) Any one of the above
394. Advantage of hydraulic valve lifter over screw adjustment type valve lifter (12A/CH-1/P-24)
1)
2) requires less maintenance
3) Are better lubricated
4) Operates more quietly
5) All the above
395. Plain bearings are generally made of (12A/CH-1/P-25)
1)
2) silver
3) Bronze
4) Aluminium
5) All the above
396. Smaller bearings used to support various shafts in accessory section (12A/CH-1/P-25)
1)
2) bumishing
3) Bushing
4) Beadring
5) As in (2) made of steel
397. Type of roller bearing used in a/c(12A/CH-1/P-25)
1)
2) straight roller bearing
3) Spherical roller bearing
4) Taper roller bearing
5) Both (1) & (3)
398. Straight roller bearings can take (12A/CH-1/P-25)
1)
2) radial load
3) Axial load
4) Thrust load
5) As in (1) both directions
Page 38 of 50
399. Advantage of a Otto cycle engine is (12A/CH-1/P-28)
1) lighter in weight
2) Stronger in construction
3) Can produce high power by supercharging
4) All the above
400. Bore of the cylinder is its (12A/CH-1/P-28)
1)
2) inside diameter
3) Outside diameter
4) Distance between T.D3) & 2)4)3)
5) Both (1) & (2)
401. The tractor - type airplane is one in which (A/C P.P/CH-2/P-15)
1)
2) propeller pulls the airplane
3) Propeller pushes the airplane
4) Propeller lifts up the airplane
5) Only (2) in correct
402. The purpose of nose section is to house (A/C P.P/CH-2/P-15)
1)
2) propeller shaft
3) Thrust bearing
4) Reduction gear train
5) All the above
403. The fuel inductions & distribution section is (A/C P.P/CH-2/P-15)
1)
2) nose section
3) Main section
4) Supercharger section
5) Both (1) & (2)
404. A fuel drain valve is generally provided on (A/C P.P/CH-2/P-15)
1)
2) nose section
3) Main section
4) Blower case
5) Both (1) & (2)
405. Which of the following bearing offers least friction (A/C P.P/CH-2/P-16)
1)
2) Roller bearing
3) Ball bearing
4) Plain bearing
5) All the above
406. A double throw crankshaft is also termed as (A/C P.P/CH-2/P-19)
1)
2) 90 degree crankshaft
3) 180 degree crankshaft
4) 300 degree crankshaft
5) 720 degree crankshaft
407. A six throw crankshaft is also termed as (A/C P.P/CH-2/P-21)
1)
Page 39 of 50
2) 30 degree crankshaft
3) 60 degree crankshaft
4) 90 degree crankshaft
5) 180 degree crankshaft
408. Blow by is evidenced by the emission of oil vapor & blue smoke from the engine (A/C P.P/CH2/P-26)
1)
2) crank case
3) Manitold
4) Carburetor
5) Breather
409. Excessive emission of blue smoke from the exhaust or from the breather indicates that repair
should be made to (A/C P.P/CH-2/P-26)
1)
2) piston
3) Cylinder barrel
4) Rings
5) Cylinder head
410. The greatest wear in a reciprocating engine usually occurs between (A/C P.P/CH-2/P-26)
1) barrel & piston
2) Barrel & rings
3) Crankshaft & main bearing
4) As in (3) also on crankshaft
411. Prevention of gas pressure leakage is function of (A/C P.P/CH-2/P-26)
1)
2) compression ring
3) Oil control ring
4) Oil wiper ring
5) Oil scraper ring
412. Maintaining a thin film of oil on cylinder wall is function of (A/C P.P/CH-2/P-26)
1)
2) compression ring
3) Oil control ring
4) Oil wiper ring
5) Oil scraper ring
413. Drawing excess oil back in to the crankcase is function of (A/C P.P/CH-2/P-26)
1)
2) compression ring
3) Oil ring
4) Oil control ring
5) Oil scraper ring
414. Oil scrapper ring is installed in the grooves located [A/C P.P/CH-2/P-26]
1) immediately below the piston head
2) above the piston pin bass
3) below the piston pin boss
4) all the above
415. If too much oil enters the combustion chamber [A/C P.P/CH-2/P-26]
1) it will lubricated the rings properly
2) it will reduce friction to a good extent
3) it will provide better cooling
Page 40 of 50
4) it will burn the oil to form carbon deposits
416. The carbon deposit formed due to burning of excess oil in combustion chamber may lead to [A/C
P.P/CH-2/P-26]
1) spark plug fouling
2) detonation
3) pre-ignition
4) all of the above
417. Piston rings usually have the following cross sections [A/C P.P/CH-2/P-26]
1)
2) ventilator, wiper & uniflow effect
3) ventilated, scraper & uniflow effect
4) ventilated, wiper & uniflow effect
5) all the above
418. Full floating piston pins must be fitted with [A/C P.P/CH-2/P-27]
1) steel plugs
2) aluminum plugs
3) nickel plugs
4) as in (2) or non ferrous plugs
419.Which of the following is not attached at the cylinder [A/C P.P/CH-2/P-28]
1) valves
2) rocker arms
3) spark plug
4) tappets
420. Two major units of a cylinder assembly are [A/C P.P/CH-2/P-28]
1) head & barrel
2) head & fins
3) head & valves
4) head & spark plug
421. Honing is done on cylinder wall to obtain [A/C P.P/CH-2/P-28]
1)
2) a smooth surface
3) a machined surface
4) a finely scratched surface
5) a polished surface
422. A cylinder barrel with diameter towards the head lesser as compared to di1) toward the skirt is
known as [A/C P.P/CH-2/P-28]
1) choked cylinder
2) choke bored cylinder
3) deep bored cylinder
4) none
423. Hydraulic lock can be prevented by [A/C P.P/CH-2/P-28]
1) using hydraulic lock defenders
2) using special piston
3) using special piston rings
4) using extra long skirt
424. Which of the following is true [A/C P.P/CH-2/P-29]
1) intake side has less fins as compared to exhaust.
2) Exhaust side has less fins as compared to intake
3) Both have equal number of fins
Page 41 of 50
4)
Depends on installation location
425. The amount of power of an engine depends upon (C & W- 42)
1. cylinder pressure
2. piston area
3. length of stroke
4. all of these
426. The Intake pipes are usually provided with
washer and exhaust pipes are usually
provided with
washer [A/C P.P/CH-2/P-29]
1)
2) steel, asbestoses
3) asbestoses, steel
4) synthetic rubber, nylon
5) synthetic rubber, asbestoses
427. Rocker box inter cylinder drains allows [A/C P.P/CH-2/P-29]
1) equaling of pressure
2) flow of lubrication oil
3) both (1) & (2)
4) none
428. Valves of reciprocating engine are some times termed as poppet valve because [A/C P.P/CH-2/P30]
1)
2) due to its shape
3) due to its curvature
4) due to its operating action
5) none
429. the stem of same redial engine valve have a narrow groove below the lock-ring groove for
installation of [A/C P.P/CH-2/P-30]
1) safety circlets
2) spring rings
3) both (1) & (2)
4) as (3) prevents valve loose falling into crankeas
430. The valve stem is accurately dimensioned to provide proper clearance in
1)
2) cylinder head
3) valve tip clearance
4) valve guide
5) none
431. Intake valves of low power engines usually have [A/C P.P/CH-2/P-31]
1) flat head
2) tulip head
3) semi-tulip head
4) mushroom head
432. Valve springs are held in place by [A/C P.P/CH-2/P-32]
1)
2) valve spring holder
3) valve spring retainer
4) as in (1) along with split keys
5) as in (2) along with split keys.
433. A device for actuating the valve lifting mechanism [A/C P.P/CH-2/P-32]
1)
2) pin
3) crank pin
Page 42 of 50
4) piston pin
5) none
Page 43 of 50
434. The hydraulic valve unit assembly consists of [A/C P.P/CH-2/P-33]
1) cylinder, plunger spring, ball check valve
2) as in (1) & plunger, piston, oil outlelt
3) as in (2) & oil inlet tube
4) as in (1) & plunger and oil inlet tube
435. The tappet is enclosed in a housing called [A/C P.P/CH-2/P-35]
1) tappet tube
2) tappet boss
3) valve tappet guide
4) valve tappet tube.
436. To adjust the clearance between rocker arm & valve tip a clearance-adjusting screw is provided on
[A/C P.P/CH-2/P-35]
1) cam shaft
2) tapper
3) puch rod
4) rocker arm
437. The normally aspirated piston engine is
1) external combustion engine
2) Internal combustion engine
3) Constant volume cycle engine
4) Both (2) & (3) are correct
438. Which statement is true regarding bearings used in high-powered reciprocating aircraft engines:
1) the outer race of a single-row, self-aligning ball bearing will always have a radius equal to the radius
of the balls.
2) there is less rolling friction when ball bearings are used than when roller bearings are
employed
3) crankshaft bearings are generally of ball type due to their ability to withstand extreme loads without
overheating
439. Which propeller reduction gear ratio with cause the highest propeller RPM? (Assume the same
engine RPM in each case)
1) 16:7
2) 20:9
3) 3:2
Jeppesen Powerplant Study Guide, P-1-1
441. Grinding the valves of a reciprocating engine to a feather edge is likely to result in:
1) normal operation and long life
2) excessive valve clearance
3) preignition and burned valves
442. (i) cast iron piston rings may be used in chrome plated cylinders
(ii) chrome plated rings may be used in plain steel cylinders
Regarding the above statement
(a) only no. 1 is true
(b) neither no. 1 nor 2 no 2 is true
(c) both no. 1 and no. 2 are true
Jeppesen Powerplant Study Guide, P-1-15
Page 44 of 50
443. Before attempting to start a radial engine that has been shutdown for more than 30 minutes:
1) turn the propeller by hand three of four revolutions in the opposite direction of normal rotation to
check for liquid lock
2) turn the ignition switch on before energizing the starter
3) turn the propeller by hand three to four revolutions in the normal direction of rotation to
check for liquid lock
444. An increase in manifold pressure with a constant RPM will cause the bearing load in an engine to:
1) decrease
2) remain relatively constant
3) increase
445. (i) Preignition is caused by improper ignition timing.
(ii) Detonation occurs when an area of the combustion chamber becomes incandescent and ignites
the fuel/air mixture is advance of normal timed ignition.
Regarding the above statement
1) only No. (i) is true
2) both no. (i) and no. (ii) is true
3) neither no. (i) nor no. (ii)
is true
446. In a valve timing diagram, the intake valve opens 15 degree BTC during exhaust stroke and closes
60 deg ABC during compression stroke, then the total period the valve remains opened in a cycle is :
1) 230 deg
2)235 deg
3) 255 deg
4)260 deg
Powerplant, P-44
447. Thermal efficiency is depends upon:
1) friction loss
2) cooling system
above
K & W, P-54
448. Volumetric efficiency is min., when:
1) throttle, opening is minimum
3) may be (a) or (b)
K & W, P-55
3) exhaust gasses
4) all of the
2) throttle opening is maximum
449. Find the thermal efficiency of particular engine. Which delivering power 100 bhp for the pierod of
2 hrs. and during that time consumption fuel is 10 galloon. The heat value of fuel is 20,000 Btu (1
galloon=6 lb)
1) 21.2%
2) 10.6%
3) 86%
4) 83.05%
450. An engine producing 90 hp burn about 50 lb/hr. of gasoline. The heat value of 10 lb/hr. gasoline is
2000 Btu. Find the power of engine.
1) 47.15 hp
2) 235.75 hp
3) 175.25 kw
4) (b) & (c)
K & W, P-54
451. An engine bore is 9 inch and stroke is equal to 6 inch. It is running at the speed of 3000 rpm and
producing 1000 bhp and completed 28 no. of cycles. Find its break mean effective pressure:
1) 86.5 lbs/in2
2) 86.5 lbs/ft2
3) 7.21 lbs/in2
4) 7.21 lbs/ft2
FAA-12A, -36
452. Given data:
force measured = 300 lbs
find the brake horse power of engine
1) 114
2) 116
length of arm=4 ft
3) 59
revolution/min=2000
4) 57
Page 45 of 50
FAA-12A, -35
453. Find the approximate piston displacement of the 14 cylinder engine having a cylinder with 4 inch
di1) 5 inch stroke:
1) 87.92
2) 879.2
3) 62.8
4) none
FAA-12A, -31
454. With increase in bhp crankshaft speed will:
1) increase
2) decrease
3) no effect
FAA-12A, -25
4) none
455. if speed of the blade tip is approaches to sound speed. The efficiency of the propeller will be:
1) max.
2) reduces slowly
3) reduces rapidly
4) no effect
FAA-12A, -36
456. Reduction gears are manufactured by:
1) alloy steel
2) forged steel
FAA-12A, -26
457. Spur & pinion system are used for:
1) opposed engine
2) inline engine
& (c)
FAA-12A, -26
3) forged aluminium alloy
4) none
3) v-type engine
(d) both (b)
458. For constant brake horse power, if RPM of an engine increases; then torque will
1) increase
2) decrease
3) remains same
4) none
Powerplant, P-51
459. The main journal is surface hardened by nitriding for a depth of :
1). 0.15 to 0.25 inch.
2). 0.015 to 0.025 inch 3). 0.20 to 0.30 inch
(ref. A/C power plant, page-17)
460 Where is the sludge chamber in the engine :
1). Crank pin
2). Crankshaft journal. 3). Crank case
(ref. A/C power plant, page-17)
4). 0.0015 to 0.0025
4). Crank cheek
461 Ignition occurs in the :
1). Compression stroke
3). Power stroke
(ref. FAA 12A, page-29)
2). Induction stroke
4). Ignition stroke
462
Combustion should be completed :
1). At the beginning of the power stroke
3). At the beginning of the exhaust stroke
(ref. A/C power plant, page-43)
2). At the end of the power stroke
4). At the end of the exhaust stroke
463
The critical altitude is the :
1). Lowest level at which an engine will maintain a given h.p. output
2) any level at which an engine will maintain a given h.p. output
3) highest level at which an engine will maintain a given h.p. output
4) both 1 and 3 are correct
Page 46 of 50
(ref. A/C power plant, page-53)
464
Double throw crankshaft is used for :
1). Double row radial engine 2). Single row radial engine 3). opposed - type engine
engine.
(ref. FAA 12A, page-12)
465
Big end of the connecting rod is connected to the :
1). Piston
2). Crank pin
3). Crank shaft journal
(ref. A/C power plant, page-22)
4). Four cylinder
4) rocker arm
466. Propeller reduction gears of :
1). Spur gear arrangement
2). Planetary gear arrangement.
3). Bevel planetary gear arrangement 4). All are correct
(ref. FAA 12A, page-26)
467 If the craburettor air temperature increases, the volumetric efficiency of the engine will :
1). Increase 2) remain same
3) decrease
4) both 2 & 3 are correct
(ref. A/C power plant, page-55)
468
One cam ring for radial engine having :
1). One cam track
2) two cam track
3) three cam track
(ref. FAA 12A, page-22)
469
Accessory case is generally made up of :
1). Steel alloy
2) magnesium alloy
3) titanium alloy
(ref. A/C power plant, page-15)
4) four cam track
4) all above are correct
470 In the planetary gear arrangement , sun gear on the crankshaft, bell gear stationary, if the crankshaft rotates
anticlockwise , propeller shaft will rotate :
1). Clockwise
2). Anticlockwise 3). Opposite direction
4). Both 1 and 3 are correct
(ref. FAA 12A, page-26)
471. Which type of reciprocating engine is suitable for horizontal
installation an wings:
1). Up right engine
2). Inverted engine
3). Vertical engine
4). Opposed engine
(Ref. FAA 12A, page 5)
472. The center of rotation of crankshaft is:
1). Crank pin
2). Piston pin
3). Both 1 & 2
4). main journal
(Ref. FAA 12A, page 11)
473. A six throw crank shaft is used with:
1). 6 – cylinder V- type engine
2). 12 cylinder V-type engine
3). 12 cylinder opposed engine
4) 18 cylinder radial engine
(Ref. FAA 12A, page 11)
474. No. of articulated rod in 18 cylinder radial engine are:
Page 47 of 50
1). Eighteen
2). Sixteen
(Ref. FAA 12A, page 13)
3). Twelve
4). Ten
475. Cross section of articulated rod is:
1). H
2). O
3). C
(Ref. FAA 12A, page 13)
4). Either H or I
476. Articulated rod bushing is mode of:
1). Brass
2). Bronze
(Ref. FAA 12A, page 13)
3). Steel
4). Both 2 & 3
477. The firing order of a particular four cylinder opposed engine may be:
1). 1-3-234
2). 1-4-2-3
3). Either 1 or 2
4). As in 3 & 1-2-3-4
(Ref. FAA 12A, page 19)
478. The firing order of 18-cylinder radial engine is:
1. 1-12-5-14-7-18-11-4-15-8-2-3-9-17-6-10-13-16
2. 1-2-3-4-5-6-7-8-9-10-11-12-13-14-15-16-17-183. 1-12-5-16-9-2-13-6-17-10-3-14-7-18-11-4-15-8
4. None of the above
(Ref. FAA 12A, page 19)
479. The fuel air mixture enters in the cylinder through the:
1). Intake port
2). Exhaust port
3). Carburetor
4). Manifold
(Ref. FAA 12A, page 20)
480. The burned gases are expelled from the cylinder through the:
1). Manifold
2). Intake port
3). Exhaust port
4). None of the above
(Ref. FAA 12A, page 20)
481. The satellite is welded to the exhaust valve face to a thickness of:
1). 1/6 inch
2). 1/16 inch
3). 3/16 inch
(Ref. FAA 12A, page 21)
4). 1/8 inch
482. On modern aircraft engines, the FHP is:
1). 10-15% of IHP
2). 15-20% of IHP
3). 10-15% of BHP
4). 15-20% of BHP
(Ref. FAA 12A, page 35)
484. Propeller reduction gears are machined from:
1). Steel forgings
2). Cr-Ni-Steel
3). Cr-V-Steel
4). Steel casting
(Ref. FAA 12A, page 26)
485. The propeller shaft of a high output engine generally is:
1). Flanged
2). Tapered
3). Splined
(Ref. FAA 12A, page 26)
4). None
486. The planetary reduction gear systems are used with:
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1). Radial engine
3). Both 1 & 2
(Ref. FAA 12A, page 26)
2). Opposed engine
4). Inline & V-type engine
487. When the engine valve is closed, the face of the tappet body:
1). Is on the top of the cam
2). Is on the back of the cam
3). Touches the push rod
4). Both 2 & 3 are correct
(Ref. FAA 12A, page 23)
488. Flange type propeller shafts are used with many modern opposed engines with power ratings upto:
1). 250 HP
2). 350 HP
3). 450 HP
4). None
(Ref. FAA 12A, page 21)
489. Aircraft engine may be equipped with the type of propeller shaft is:
1). Taper
2). Spline
3). Flange
4). All are correct
(Ref. FAA 12A, page 20)
490. Some pistons have the skirt cut out at the bottom to clear the:
1). Crankshaft throw
2). Crankshaft main journal
3). Crankpin
4). Crankshaft counter weight
(Ref. FAA 12A, page 25)
491. Which type of engine has least vibration? (C & W- 4)
1). inline engine
2). opposed engine
3). radial engine
4). all of these
492. Which type of engine has least weight to horse power ratio? (C & W- 3)
1). opposed engine
2). radial engine
3). inline engine
4). none of these
493. The weight per horse power ratio of V- type engine is (C & W- 3)
1). more than inline
2). equal to inline
3). less than inline
4). none of these
494. Mark the correct statement (C & W- 3)
1). energy is the capacity for doing work
2). volume of any dry gas inversely with absolute pressure
3). pressure is directly proportional to absolute temperature
4). all of these
495. Volume of any dry gas varies inversely with its absolute pressure according to (C & W- 41)
1). boyle’s law
2). charle’s law
3). carnot’s law
4). newton’s law
496. The supercharger section is also known is (C & W- 14)
1). blower section
2). fuel induction section
3). fuel distribution section
4). all of these
497. Which one of the following component may installed in accessory section (C & W- 15)
1). cuno filter
2). fuel pump
3). vacuum pump
4). all of these
498. Which one is not a part of cylinder assembly? (C & W- 17)
1). valve guide
2). valve seat
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3). spark plug bushing
4). crank shaft
499. The steam engine is an example of (Page -1, Dale crane)
1). internal combustion engine
2). external combustion engine
3). either internal or external combustion engine
4). none of these
500. The disadvantage of steam engine is (Page -1, Dale crane)
1). required less fuel
2). required low cost fuel
3). do not effectively convert the heat provided by the fuel into mechanical work
4). less vibration
501. What is the advantage of steam engine (Page – 1, Dale crane)
1). can used low cost fuel
2). large size
3). less vibration
4). small frontal area
502. In aircraft piston engine type of fuel used (Page – 1, Dale crane)
1). Diesel fuel
2). Gasoline
3). Alcohol
4). all of these
503. Type of radial engine (Page – 2, Krores & wild)
1). rotary type
2). static type 3). both static and rotary type
4). none of these
504. In- line engine has generally (Page no. 3, Kroes wild)
1). even number of cylinder
2). odd number of cylinder
3) either odd or even number
4). none of these
505. V-type engine may be (Page – 3, Kroes wild)
1). upright
2). inverted
3). either upright or inverted
4). none of these
506.
1).
2).
3).
4).
Intake values are identified by (Page – 21, FAA- 12A)
flat mark on their tip
orange band of their face
blue band on their face
none of the above
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