Automobile Engineering MCQ Questions
1-A tandem master cylinder has
(A) One piston
(B) Two pistons
(C) Three pistons
(D) No piston
2-A transfer case in used
(A) All vehicles
(B) Front wheel drive vehicle
(C) Rear wheel drive vehicle
(D) Four wheel drive vehicle
3-Which of the following has negative temperature co-efficient of resistance?
(A) Carbon
(B) Copper
(C) Aluminium
(D) Iron
4-In the air brake system, the valve which regulates the line air pressure is
(A) Brake valve
(B) Delivery valve
(C) Thermostat valve
(D) Unloader valve
5-“R134a” is:
(A) A brake fluid
(B) A coolant
(C) A lubricant
(D) A refrigerant
6-In a modern automobile gearbox, most of the gears are:
(A) Spur gears
(B) Helical gears
(C) Herringbone gears
(D) Spiral bevel gears
7-The clutch cover is bolted to the:
(A) Pressure plate
(B) Crankcase
(C) Gearbox
(D) Flywheel
8-The facing of the clutch friction plate is made of:
(A) Asbestos
(B) Rubber
(C) Steel
(D) Cast iron
9-The electrolyte used in a lead acid battery is:
(A) Hydrochloric acid
(B) Sulphuric acid
(C) Nitric acid
(D) Lead peroxide
10-Which of the following is not a part of differential assembly?
(A) Crown wheel
(B) Sun gear
(C) Pinion
(D) Universal joint
ANSWERS:
1-(B), 2-(D), 3-(A), 4-(D), 5-(D), 6-(B), 7-(D), 8-(A), 9-(B), 10-(D)
11-The ‘Ackerman mechanism’ is related to:
(A) Air conditioning system
(B) Transmission system
(C) Steering system
(D) Lubrication system
12-Tread wear indicator is located:
(A) On the tyre, where the tread meets the side wall
(B) On the dashboard of the vehicle
(C) At the wheel alignment shops
(D) On the front bumper of the vehicle
13-Tyre rotation is carried out for:
(A) Reconditioning of a damaged tyre
(B) Equalizing the wear of all the tyres in a vehicle
(C) Free movement of the tyres
(D) Removing impurities from the tyre
14-In tubeless tyres
(A) Air is filled in a tube inside the tyre
(B) Air is filled in between rim and the tyre
(C) No air is required
(D) Liquid is filled in place of air
15-When the child lock is ON:
(A) The door can be opened from inside
(B) The door cannot be opened from outside
(C) All the doors will be closed automatically
(D) The door cannot be opened from inside
16-The term ‘Gross Vehicle Weight’ indicates:
(A) The maximum operating weight of a vehicle without trailer
(B) Weight of the vehicle without passengers
(C) Weight of the vehicle when its body is removed
(D) Weight of the passengers a vehicle can carry
17-The crumple zone is:
(A) A garage, where the unserviceable vehicles are kept
(B) The space inside the luggage compartment of the vehicle
(C) The area which cannot be seen by the driver
(D) The part of the vehicle, designed to absorb the energy during a collision
18-Seat belts used in cars are generally:
(A) Two point type
(B) Three point type
(C) Four point type
(D) Six point type
19-The ‘immobilizer’ is:
(A) A mobile phone charging device used in cars
(B) An electronic security device for vehicles
(C) An automobile tyre changing equipment
(D) A trailer attached to the carriage vehicles
20-The type of car in which the driver’s cabin is separated from the rear compartment by using a
window is called:
(A) Sedan
(B) Coupe
(C) Limousine
(D) Station wagon
ANSWERS:
11-(C), 12-(A), 13-(B), 14-(B), 15-(D), 16-(A), 17-(D), 18-(B), 19-(B), 20-(C)
21-The chassis frame of vehicles is narrow at the front, because:
(A) It gives smaller turning radius to the vehicle
(B) Number of tyres is less at the front
(C) Weight of the vehicle is less at the front
(D) It helps to reduce the weight of the frame
22-The metal used for body building of automobiles is generally:
(A) Cast iron
(B) Steel
(C) Copper
(D) Aluminium
23-Spark plug ‘reach’ means:
(A) The heat range of the spark plug
(B) The length of central electrode
(C) The length of the threaded portion of the spark plug shell
(D) The gap between the spark plug terminals
24-In an automobile, solenoid switch is a part of:
(A) Starting system
(B) Ignition system
(C) Charging system
(D) Lighting system
25-Which of the following is not a function of fuel injection system in the diesel engine?
(A) To atomise the fuel
(B) To supply the fuel into the cylinder in mentioned quantity
(C) To prepare air-fuel mixture in the inlet manifold for combustion
(D) To pressurize the fuel so that it can enter into the compressed air in the cylinder
26-The positive crankcase ventilation system helps:
(A) To redirect the blow by gases in the crankcase to inlet manifold
(B) To reduce the atmospheric pollution caused by the engine
(C) To prevent air dilution and sludge formation
(D) All of the above
27-The force which retards the motion of one body, in contact with another body is called
(A) Friction
(B) Adhesion
(C) Cohesion
(D) Torsion
28-If you notice the presence of engine oil inside the radiator filler neck, the reason can be:
(A) Defective radiator pressure cap
(B) Damaged cylinder head gasket
(C) Defective thermostat valve
(D) Defective oil pump
29-Which process gives the engine cylinder a cross hatch pattern?
(A) Drilling
(B) Boring
(C) Facing
(D) Honing
30-In a diesel engine, the fuel gets ignited by:
(A) Fuel injector
(B) Electric spark
(C) Heater plug
(D) Heat of compressed air
ANSWERS:
21-(A), 22-(B), 23-(C), 24-(A), 25-(C), 26-(D), 27-(B), 28-(B), 29-(D), 30-(D)
31-When the piston is at BDC, volume of the cylinder above the piston is:
(A) Clearance volume
(B) Swept volume
(C) Total volume
(D) Compression ratio
32-“Scuffing” occurs when:
(A) Piston slides against cylinder without lubrication
(B) Piston clearance is excessive
(C) Piston rings are worn out
(D) Cylinders liner is worn out
33-Opening and closing of the valves in relation to the position of piston and flywheel is called:
(A) Valve lead
(B) Valve lag
(C) Valve overlap
(D) Valve timing
34-The ratio of work output of an engine to the fuel energy burnt is called
(A) Mechanical efficiency
(B) Volumetric efficiency
(C) Thermal efficiency
(D) Overall efficiency
35-Snips are used for
(A) Cutting away thick layer of metal
(B) Cutting sheet metal
(C) Cutting wooden blocks
(D) Cutting external threads
36-A round rod which does not have a head, and has external threads at both ends is called:
(A) Stud
(B) Bolt
(C) Nut
(D) Screw
37-Which of the following is not a precision measuring instrument?
(A) Outside micrometer
(B) Dial indicator
(C) Vernier height gauge
(D) Universal surface gauge
38-The cross-sectional shape of an allen key is:
(A) Square
(B) Pentagon
(C) Hexagon
(D) Octagon
39-Which file has minimum space between their teeth?
(A) Rough files
(B) Smooth files
(C) Coarse files
(D) Bastard files
40-Which of the following is used for securing a tightened nut in position?
(A) Key
(B) Cotter pin
(C) Snap ring
(D) Gasket
ANSWERS:
31-(C), 32-(A), 33-(D), 34-(C), 35-(B), 36-(A), 37-(D), 38-(C), 39-(B), 40-(D)
Objective Questions on Automobile Engineering
1-The degree of variation of a liquid with temperature is termed as
(A) Kinematic viscosity
(B) Absolute viscosity
(C) Viscosity index
(D) None of the above
2-The power utilized to propel the vehicle is known as
(A) FHP
(B) BHP
(C) DHP
(D) IHP
3-The cross section of brake shoe is of:
(A) T-section
(B) I-section
(C) H-section
(D) U-section
4-The component of pressure spring type single plate clutch system which disengage from
flywheel when pressing clutch pedal is
(A) Pressure plate
(B) Clutch cover
(C) Clutch disc
(D) Release bearing
5-If the speed of vehicle is doubled the air resistance is:
(A) Increased by four times
(B) Decreased by four times
(C) Increased by two times
(D) Decreased by two times
6-Which among the following is an example of positive clutch?
(A) Jaw clutch
(B) Multiple clutch
(C) Single plate clutch
(D) All of the above
7-The component of battery ignition system which helps to avoid spark between CB point is:
(A) Ballast resistor
(B) Condenser
(C) Rotor
(D) Spark plug
8-The CB point gap is in the range of
(A) 0.35 mm to 0.45 mm
(B) 0.35 mm to 0.45 mm
(C) 0.30 mm to 0.40 mm
(D) 1 mm to 1.35 mm
9-Which type of fuel supply system is commonly used in motor cycle?
(A) Gravity system
(B) Pressure system
(C) Vacuum system
(D) Pump system
10-Which of the following is not an advantage of two stroke engine compared to four stroke
engine of same size?
(A) Lighter in weight
(B) Higher volumetric efficiency
(C) More power is produced
(D) None of the above
ANSWERS:
1-(C), 2-(B), 3-(A), 4-(C), 5-(A), 6-(A), 7-(B), 8-(A), 9-(A), 10-(B)
11-The condenser used in battery coil ignition circuit is connected in:
(A) Parallel to CB points
(B) Series to CB points
(C) Either in series or parallel to CB points
(D) None of the above
12-Accelerator linkage of a petrol engine using carburetor is connected to:
(A) Choke valve
(B) Air cleaner
(C) Throttle valve
(D) Manifold
13-Which of the following is not a cause for diesel engine does not start?
(A) Air in the fuel system
(B) Blocked or clogged fuel filter or fuel lines
(C) Small leakage in diesel tank
(D) None of the above
14-Which of the following cold starting device is used in diesel engine?
(A) Choke valve
(B) Cooling coil
(C) Priming pump
(D) Glow plug
15-The needle valve of carburetor is closed and opened by:
(A) Air jet
(B) Main petrol jet
(C) Throttle valve
(D) Float
16-What is the purpose of providing vertical slot or T-slots on piston?
(A) For the seating of compression ring
(B) For the seating of oil ring
(C) For lubrication
(D) Restrict the change in diameter during thermal expansion
17-What is the advantage of aluminium alloy piston over cast iron piston of same size?
(A) Higher brittleness
(B) Less thermal conductivity
(C) Lighter in weight
(D) All of the above
18-What material is plated on bore of aluminium alloy cylinder blocks to obtain a wear resistant
surface?
(A) Chromium
(B) Sulphur
(C) Silicon
(D) Alumina
19-Most of the coolant pumps used in automobile are of:
(A) Gear type
(B) Vane type
(C) Reciprocating type
(D) Impeller type
20-Which of the following is not an effect of providing cooling fins around engine cylinder?
(A) Increase heat transfer area
(B) Decrease heat transfer rate
(C) Increase cooling efficiency
(D) None of the above
ANSWERS:
11-(A), 12-(C), 13-(C), 14-(D), 15-(D), 16-(D), 17-(C), 18-(C), 19-(D), 20-(B)
21-In tubular type radiator cores:
(A) Air flows through tubes and coolant passes around
(B) Coolant passes through tube and air passes around
(C) Air and coolant passes through tubes
(D) Air and coolant passes around tubes
22-The volatile liquid that filled in bellows type thermostat is:
(A) Ethylene glycol
(B) Freon
(C) Acetone
(D) Glycerene
23-What operation has to be done on the ends of brake pipe to prevent leakage?
(A) Purging
(B) Reaming
(C) Counter sinking
(D) Flaring
24-The brake pads of disc brakes are returned by:
(A) Retractor spring
(B) Rubber seal ring
(C) Shoe return spring
(D) Caliper
25-The part of hydraulic brake system which actuates brakes shoes directly:
(A) Master cylinder
(B) Push rod
(C) Wheel cylinder
(D) Brake pedal
26-The type of jack with diamond shaped frame having a nut on one side and sleeve on other side
(A) Tripod
(B) Trolley type
(C) Scissor type
(D) Bottle type
27-Which of the following is a finishing operation for machined components?
(A) Broaching
(B) Cyaniding
(C) Vulcanization
(D) Honing
28-In Semi floating type rear axle, the bearing is located
(A) On the axle and inside axle casing
(B) On the axle casing and inside the hub
(C) On the axle and inside the hub
(D) None of the above
29-The tool which is used to remove gear, bearing, wheels and pulleys from their attaching
components are:
(A) Screw driver
(B) Monkey plier
(C) Pullers
(D) Hammer
30-The type of gear wheels used in sliding mesh gear box is:
(A) Helical gear
(B) Double helical gear
(C) Spur gear
(D) Spiral gear
ANSWERS:
21-(B), 22-(C), 23-(D), 24-(A), 25-(C), 26-(C), 27-(D), 28-(A), 29-(C), 30-(C)
31-In compound wound starter motors the field coil is
(A) Connected parallel with the armature
(B) Both series and parallel with the armature
(C) Connected in series with the armature
(D) None of the above
32-Which among the following material is used as a solid lubricant?
(A) Calcium chloride
(B) Calcium carbonate
(C) Copper sulphate
(D) Graphite
33-How many cells are there in a 12 V lead acid battery?
(A) 2
(B) 4
(C) 6
(D) 12
34-Which among the following bearings are commonly known as antifriction bearing?
(A) Foot step bearing
(B) Journal bearing
(C) Collar bearing
(D) Ball and roller bearing
35-The type of combustion chamber which is made as a depression on the top of piston is called:
(A) Pre-combustion chamber
(B) Energy cell
(C) Open combustion chamber
(D) Ante chamber
36-The space between the piston and cylinder wall is called
(A) Piston clearance
(B) End clearance
(C) Lip clearance
(D) None of the above
37-Helical control groove in FIP is provided in
(A) Control sleeve
(B) Control pinion
(C) Plunger
(D) Pump cylinder
38-The mechanism which uses fly weights to advance spark in the engine cylinder is:
(A) Vacuum advance mechanism
(B) Centrifugal advance mechanism
(C) Manual advance mechanism
(D) None of the above
39-The component of battery coil ignition system which convert battery voltage into breakdown
voltage is called
(A) Condenser
(B) Ignition coil
(C) Ballast resistor
(D) Distributor
40-If the engine is continuous to run after the ignition is turned off is called:
(A) Dieseling
(B) Percolation
(C) Purging
(D) Flooding
ANSWERS:
31-(C), 32-(D), 33-(C), 34-(D), 35-(A), 36-(A), 37-(C), 38-(B), 39-(D), 40-(A)
41-Diaphragm type mechanical fuel pump is driven by
(A) V-belt
(B) Chain
(C) Camshaft eccentric
(D) Cooling fan
42-Which of the following compound is added to petrol to improve its anti knocking property?
(A) Sodium bicarbonate
(B) Calcium bicarbonate
(C) Potassium nitrate
(D) Tetra ethyl lead
43-The size of flywheel used in single cylinder 4-stroke engine compared to a flywheel of the
single cylinder 2-stroke engine of same capacity is
(A) Larger
(B) Smaller
(C) Same
(D) None of the above
44-The number of crank pin in the crank shaft of a V-type engine is:
(A) Equal to number of cylinder
(B) Equal to double the number of cylinder
(C) Equal to half of number of cylinder
(D) None of the above
45-If the single cylinder produces a power in each rotation of crank shaft, then the engine is a:
(A) 4-stroke engine
(B) 2-stroke engine
(C) Wankel engine
(D) All of the above
46-Variable steering ratio can be achieved in case of
(A) Worm and sector
(B) Worm and nut
(C) Rack and pinion
(D) Worm and roller
47-The pollutant that is formed at higher combustion temperature is
(A) CO
(B) HC
(C) NO2
(D) H2O
48-Which gear will not revolve when the vehicle is moving on straight path?
(A) Planetary gear
(B) Sun gear
(C) Crown wheel
(D) Pinion
49-The type of body movement of a vehicle in which the vehicle turn on its own longitudinal axis
is:
(A) Pitching
(B) Bouncing
(C) Yawing
(D) Rolling
50-In a tyre, it is designated as ‘P200/75 R16’. What is the digit 200?
(A) Section width
(B) Section height
(C) Rim diameter
(D) Aspect ratio
ANSWERS:
41-(C), 42-(D), 43-(A), 44-(C), 45-(B), 46-(C), 47-(C), 48-(A), 49-(D), 50-(A)
51-The tilt of the front wheels from vertical, when viewed from the front, is called:
(A) Caster
(B) Camber
(C) King pin inclination
(D) Toe in
52-Pick the odd one out:
(A) Half shaft
(B) Clutch shaft
(C) Main shaft
(D) Lay shaft
53-How many synchronizer units are there in a three speed transmission?
(A) One
(B) Two
(C) Three
(D) Four
54-Hydrometer is device used to check:
(A) Voltage of a cell
(B) Specific gravity of acid
(C) Voltage of a battery
(D) Temperature of electrolyte
55-A slip joint permits changes in
(A) Wheel base
(B) Wheel track
(C) Wheel alignment
(D) None of the above
56-In case of front engine rear wheel drive cars, the drive shaft has:
(A) Minimum one universal joint
(B) Maximum two universal joints
(C) Minimum two universal joints
(D) Two slip joints
57-Transfer case is a type of ___ in four wheel drive vehicles.
(A) Crank case
(B) Gear box
(C) Transmission shaft
(D) Differential
58-The temperature below which the oil will not flow is:
(A) Fire point
(B) Flash point
(C) Pour point
(D) Flow point
59-PCV valve is located between:
(A) Crank case and inlet manifold
(B) Crank case and carburetor
(C) Air cleaner and crank case
(D) Air cleaner and carburetor
60-Geerally turbo charger is operated by:
(A) A belt driven by the engine crank shaft
(B) A gear attached to the cam shaft
(C) A chain and sprocket drive
(D) Exhaust gas
ANSWERS:
51-(B), 52-(A), 53-(B), 54-(B), 55-(A), 56-(C), 57-(C), 58-(C), 59-(A), 60-(D)
61-Mechanical fuel pumps are operated by
(A) Cam in the cam shaft
(B) Eccentric in the crank shaft
(C) Skew gear in the cam shaft
(D) Eccentric in the cam shaft
62-Low Cetane fuel implies that
(A) It takes linger time to ignite
(B) It takes lesser time to ignite
(C) Ignites as soon as it enters the cylinder
(D) Both (B) and (C)
63-The volume of air contained above the piston when the piston is at TDC is:
(A) Clearance volume
(B) CC
(C) Swept volume
(D) Stroke volume
64-Valve overlaps occur at:
(A) The end of exhaust valve
(B) The beginning of power stroke
(C) The beginning of compression stroke
(D) The end of power stroke
65-Thermostat valve helps the engine to:
(A) Keep the oil temperature at operating values
(B) Keep the coolant temperatures at operating values
(C) Prevents the engine from overhauling
(D) Both (B) and (C)
66-Piston rings are provided to:
(A) Completely seal the combustion gas
(B) Hold the piston concentric to cylinder walls
(C) Hold a fine oil film on cylinder walls
(D) Both (A) and (C)
67-The upper and lower ends of the combustion chamber is formed by:
(A) Piston and cylinder block
(B) Cylinder walls and piston
(C) Piston rings and cylinder head
(D) Cylinder head and piston
68-Some automobile engines have glow plugs to:
(A) Warn the driver about engine overheat
(B) Preheat the fuel for easier starting
(C) Preheat the combustion chamber
(D) Warm the passenger area
69-The main purpose of piston pin offset is to:
(A) Perfectly balance the piston during power stroke
(B) Prevent piston slip
(C) Centralize the piston
(D) Reduce piston slip
70-In an engine having swirl combustion chamber:
(A) More air fuel mixture enters
(B) Improved scavenging takes place
(C) Improved combustion takes place
(D) Burned gas has no back pressure
ANSWERS:
61-(D), 62-(A), 63-(A), 64-(A), 65-(D), 66-(D), 67-(D), 68-(B), 69-(D), 70-(C)
Automobile Engineering Questions
1-Which of the following is a rich air fuel ratio?
(A) 9:1
(B) 11:1
(C) 13:1
(D) 15:1
2-The percentage of combustion heat, available at crank shaft for useful work output is:
(A) 20%
(B) 35%
(C) 55%
(D) 60%
3-Vavle rotators are used for:
(A) Rotating the valves on its own
(B) Reducing the warping of valves
(C) Even wear distribution of valves
(D) All of the above
4-VTEC stands for
(A) Variable valve Timing Electronic Cam shaft
(B) Variable valve Timing and lift Electronic control
(C) Valve Timing Electrical Cam shaft
(D) None of the above
5-In a single cylinder two stroke engine running at 2000 RPM the number of power strokes per
minute is:
(A) 1000
(B) 2000
(C) 3000
(D) 4000
6-In automobile servicing concept, what is meant by “Tear down”?
(A) Adjusting
(B) Disassembling
(C) Reassembling
(D) Machining
7-What is most suitable to check spark plug gap?
(A) Feeler gauge
(B) Micrometer
(C) Wire gauges
(D) Vernier caliper
8-The stroke in which both the valves are closed is:
(A) Suction
(B) Compression
(C) Expansion
(D) Both (B) and (C)
9-How many times in minutes the inlet valve of a four stroke opens and closes when engine is
working at 1000 RPM?
(A) 500
(B) 1000
(C) 1500
(D) 2000
10-The purpose of tyre rotation on automobiles is to:
(A) Avoid ply separation
(B) Equalize wear
(C) Get better ride
(D) None of the above
ANSWERS:
1-(D), 2-(B), 3-(D), 4-(B), 5-(C), 6-(B), 7-(A), 8-(D), 9-(A), 10-(B)
11-Which of the following does not relate to compression ignition engine?
(A) Fuel
(B) Governor
(C) Fuel injector
(D) Carburetor
12-The venturi in the carburetor cause:
(A) Decrease of air velocity
(B) Decrease of fuel flow
(C) Increase of air velocity
(D) None of the above
13-The parking brakes employed in vehicle are
(A) Hydraulically operated
(B) Mechanically operated
(C) Pneumatically operated
(D) None of the above
14-The brake lining consists mainly of:
(A) Cast iron
(B) Copper
(C) Asbestos
(D) Rubber
15-The common firing order of six cylinder engine is:
(A) 1-5-3-6-2-4
(B) 1-5-2-4-6-3
(C) 1-3-5-2-4-6
(D) 1-6-5-4-3-2
16-The function of a shackle with a leaf spring is to:
(A) Allow pivoting of spring end
(B) Control the front torque
(C) Control the side vibration
(D) Allow spring length to change
17-The process of removing entrapped air from the hydraulic brake system, is known as
(A) Bleeding
(B) Cleaning
(C) Facing
(D) Trapping
18-The minimum number of oil compression rings in an automobile is:
(A) One
(B) Two
(C) Three
(D) Four
19-The part of crank shaft to which connecting rod is connected is called:
(A) Crank web
(B) Small end
(C) Big end
(D) Crank pin
20-The air fuel mixture required at the time of starting the engine is
(A) Lean mixture
(B) Rich mixture
(C) Stoichiometric mixture
(D) Any of the above
ANSWERS:
11-(D), 12-(C), 13-(B), 14-(C), 15-(A), 16-(D), 17-(A), 18-(B), 19-(D), 20-(B)
21-The discharged lead acid battery has on its plates:
(A) Sulphuric acid
(B) Lead peroxide
(C) Spongy lead
(D) Lead sulphate
22-The device for smoothening out the power impulse from the engine is called:
(A) Gear box
(B) Clutch
(C) Governor
(D) Flywheel
23-The inner end of the axle shaft is splined to the:
(A) Planet pinion
(B) Bevel pinion
(C) Crown Wheel
(D) Sun gear
24-If the engine coolant leaks into the engine oil, then engine oil:
(A) Turns black
(B) Turns grey in color
(C) Appears milky
(D) Brown in color
25-___ type of reflector used for automobile head lights is:
(A) Circular
(B) Hyperbolic
(C) Spherical
(D) Parabolic
26-___ is the tendency of the fuel to change from the liquid state to the vapor state at any given
temperature:
(A) Density
(B) Volatility
(C) Plasticity
(D) Viscosity
27-Which of the classification indicates multi-grade oil?
(A) SAE 90
(B) SAE 30
(C) API 60
(D) SAE 20W50
28-Automobile gears are generally made of:
(A) Aluminium alloy
(B) Cast iron
(C) Medium carbon steel
(D) Alloy steel
29-___ is a gas that pollutes the air and mainly released by cars and other vehicles
(A) Nitrogen gas
(B) Carbon di-oxide
(C) Carbon monoxide
(D) Hydrogen gas
30-If the compression ratio of IC engine increases then its thermal efficiency will:
(A) Decreases
(B) Increases
(C) Remain same
(D) None of the above
ANSWERS:
21-(D), 22-(D), 23-(D), 24-(C), 25-(D), 26-(B), 27-(D), 28-(D), 29-(C), 30-(B)
31-The radiator core is made of:
(A) Copper
(B) Aluminium
(C) Cast iron
(D) Brass
32-The slip joint permits a change in the:
(A) Angle of drive
(B) Rotation of the shaft
(C) Speed of the shaft
(D) Length of the shaft
33-The choke in an automobile is meant for supplying:
(A) Rich mixture
(B) Weak mixture
(C) Lean mixture
(D) None of the above
34-The distance between the centres of the front wheel is called
(A) Turning angles
(B) Wheel angle
(C) Axle length
(D) Wheel track
35-In a diesel engine, fuel and air mixes together in the
(A) Carburetor
(B) Fuel pump
(C) Fuel injector
(D) Combustion chamber
36-In an automobile gear transmission the counter shaft drive gear is meshed with the gear on
the:
(A) Clutch shaft
(B) Main shaft
(C) Axle shaft
(D) Propeller shaft
37-The fundamental operating principle of alternator:
(A) Electromagnetic induction
(B) Electromagnetic pressure
(C) Pascal’s law
(D) Fleming’s law
38-___ component that connects the rack to the steering knuckles is:
(A) Pinion
(B) Splined shaft
(C) Universal joint
(D) Tie rod
39-The part not to be lubricated is
(A) Differential gear box
(B) Gear box
(C) Crank shaft
(D) Thermostat
40-___ types of gear boxes are used in motor cycles:
(A) Constant mesh
(B) Progressive type gear box
(C) Epicyclic gear box
(D) Synchronous mesh gear box
ANSWERS:
31-(B), 32-(D), 33-(A), 34-(D), 35-(D), 36-(A), 37-(A), 38-(D), 39-(D), 40-(A)
41-The secondary windings of the ignition coil consists of
(A) Few turns of heavy wire
(B) Thousands of turns of small wire
(C) Many turns of heavy wire
(D) None of the above
42-Which one of the following is not a part of chassis?
(A) Wheels
(B) Passenger seats
(C) Rear axles
(D) Front axle
43-The capacity of battery is
(A) Ability to store chemical energy
(B) Ability to store electrical energy
(C) Ability to store heat energy
(D) Ability to store kinetic energy
44-The included angle is the sum of the:
(A) Camber and castor
(B) Caster and SAI
(C) Camber and SAI
(D) Camber and toe-in
45-With the increase of battery temperature, the specific gravity of electrolyte:
(A) Decreases
(B) Remains the same
(C) Increases
(D) None of the above
46-For lower loads, the automobile engine crank shaft is made of:
(A) Cast steel
(B) Cast iron
(C) Forged steel
(D) High carbon steel
47-The main function of the ignition condenser is:
(A) Increasing contact arching of terminals
(B) Reduces primary spark
(C) Reduces secondary spark
(D) Reduces arcing at the contacts
48-The angle between the central line of the king pin and vertical line is called:
(A) King-pin inclination
(B) Camber angle
(C) Caster angle
(D) Turning angle
49-The essential difference between brazing and soldering is the:
(A) Melting temperature of work piece
(B) Melting temperature of the flux
(C) Type of filler materials
(D) Melting temperature of filler materials
50-The most effective air cleaner in case of diesel engine is:
(A) Wet type
(B) Oil bath type
(C) Dry type
(D) Water bath type
ANSWERS:
41-(B), 42-(B), 43-(B), 44-(C), 45-(A), 46-(B), 47-(B), 48-(C), 49-(D), 50-(B)
Automobile Engineering MCQ
1-Following gauge is used to check bearing clearance
(A) Wire gauge
(B) Dial gauge
(C) Purg gauge
(D) Plasti gauge
2-The function of FIP is:
(A) Stormising the fuel
(B) Filtering the fuel
(C) To deliver specific quantity of fuel at specific time
(D) Suck the fuel from the fuel tank
3-The component which transmit reciprocating motion of valve lifter to rocker arm:
(A) valve guide
(B) tappet
(C) push rod
(D) rocker shaft
4-The time duration, given in degrees of distributor rotation that the Contact Breaker points
remain closed between successive openings is:
(A) Dwell
(B) Camber angle
(C) Included angle
(D) Overlap period
5-A smoking blue exhaust is due to
(A) lean mixture
(B) excessive fuel consumption
(C) burning of oil in the combustion chamber
(D) incorrect valve adjustment
6-The location of Thermostat valve in cooling system is:
(A) At engine inlet from radiator
(B) At engine outlet to radiator
(C) Between radiator and water pump
(D) Between water pump and engine
7-The engine power transfer mechanism that combines a transmission assembly and differential
assembly in a single unit is known as
(A) Multi axle mechanism
(B) Free wheel mechanism
(C) Transfer case
(D) Trans axle mechanism
8-Valve lapping is the process of grinding:
(A) Valve seat and margin
(B) Valve seat and stem
(C) Valve seat and guide
(D) Valve seat and face
9-Positive plate of lead acid battery consists of grid filled with a paste of
(A) Pb
(B) PbSO4
(C) PbSO2
(D) H2SO4
10-The two-stroke cycle engine has ports in the:
(A) Piston
(B) Cylinder walls
(C) Cylinder head
(D) None of the above
ANSWERS:
1-(D), 2-(C), 3-(C), 4-(A), 5-(C), 6-(B), 7-(D), 8-(D), 9-(C), 10-(B)
11-The main purpose of pressure radiator cap is to:
(A) pressurize the system
(B) increase air water circulation
(C) help to develop vacuum in the system
(D) avoid build up of pressure
12-Inlet valve is made up of:
(A) Nickel chromium alloy steel
(B) High carbon steel
(C) Tungsten steel
(D) Mild steel
13-The material
used for piston ring is:
(A) cast iron with silicon
(B) forged steel
(C) stainless steel
(D) aluminium alloy
14-Which among the following maintains a constant level of petrol in float chamber?
(A) Petrol main jet
(B) Float and needle valve
(C) Float and throttle valve
(D) Choke valve
15-The instrument used to measure cylinder bore diameter is:
(A) Outside diameter
(B) Vernier caliper
(C) Telescope gauge
(D) Bore dial gauge
16-The viscosity of multi-grade oil is determined at:
(A) 0°F
(B) 0°C
(C) 100°F
(D) 100°C
17-Which among the following is not a part of suspension system?
(A) Trailing link
(B) Tie rod
(C) Torsion bar
(D) Anti roll bar
18-The warpage of machined faces of cylinder block and cylinder head can be checked with:
(A) Dial gauge
(B) Telescopic gauge
(C) Straight gauge
(D) Trammel
19-Radiator pressure cap contains:
(A) Pressure valve
(B) Thermostat valve
(C) Rotary valve
(D) Pressure and Vacuum valve
20-The use of flywheel is to
(A) rotate the engine by starting motor
(B) mount clutch assembly
(C) store the energy
(D) None of the above
ANSWERS:
11-(D), 12-(A), 13-(D), 14-(B), 15-(D), 16-(D), 17-(B), 18-(C), 19-(D), 20-(C)
21-In which type of steering gearbox, variable steering ratio is achieved?
(A) worm and roller steering gear
(B) worm and nut steering gear
(C) worm and sector steering gear
(D) rack and pinion steering gear
22-The engine valves are closed by
(A) Cam shaft
(B) Crank shaft
(C) Valve spring
(D) Piston
23-The process commonly used for the manufacturing of cylinder liners is:
(A) forging
(B) centrifugal casting
(C) plaster mould casting
(D) moulding
24-The effect of carbon deposits on the cylinder head inside the combustion chamber is:
(A) increased delay period
(B) increased fuel economy
(C) reduced compression ratio and pre-ignition
(D) increased compression ratio and pre-ignition
25-In charging system the regulator acts as:
(A) An automatic control
(B) An electronic control
(C) Manual control
(D) Semi automatic control
26-The rotor type oil pump has:
(A) an inner rotor with a lobe less that the outer rotor
(B) an outer rotor with a lobe less than the inner rotor
(C) an inner rotor with a lobe more than the outer rotor
(D) two rotor with same number of lobes
27-The stub axle is connected to the front main axle beam by means of:
(A) Shackle pin
(B) Wrist pin
(C) King pin
(D) Tie rod
28-The test for finding the chemical conditions of the positive and negative battery plates is:
(A) Open volt test
(B) High discharge test
(C) Specific gravity test
(D) Cadmium test
29-The oil pump is generally driven by:
(A) Crank shaft
(B) Cam shaft
(C) Distributor
(D) Fan
30-Function of ECM is:
(A) To charge the engine according to the requirement
(B) To start the engine smoothly
(C) To control the emission
(D) To increase engine life
ANSWERS:
21-(D), 22-(C), 23-(B), 24-(D), 25-(A), 26-(A), 27-(C), 28-(D), 29-(B), 30-(A)
31-The component of the torque converter that allows multiplication of torque is the
(A) turbine
(B) impeller
(C) pump
(D) stator
32-The boiling point of the coolant in cooling system is raised by:
(A) Pressure cap
(B) Pump casing
(C) Thermostat valve
(D) Radiator
33-The formation of air pockets inside the torque converter due to low pressure is known as:
(A) Air bleeding
(B) Cavitation
(C) Free wheeling
(D) None of the above
34-If the lock to lock steering wheel rotation is four times and the front wheel movement is 60
degrees, what is the steering ratio?
(A) 15:1
(B) 18:1
(C) 24:1
(D) 21:1
35-The dynamo used in automobile is:
(A) Single pole
(B) Two poles
(C) Three poles
(D) Five poles
36-Catalytic converter is associated with
(A) automatic transmission system
(B) engine intake system
(C) emission control system
(D) vehicle braking system
37-The distance between the centres of front wheel at straight ahead position and the centre of
rear wheel is known as:
(A) Wheel track
(B) Thrust line of wheels
(C) Wheel base
(D) Toe-in of the wheels
38-The leaf springs are connected to axle beam by means of
(A) U-bolt
(B) Shackle
(C) Centre bolt
(D) Shackle pin
39-What is the purpose of heat dam in a piston?
(A) to enable the piston run cooler
(B) to keep the water temperature constant
(C) to balance the piston
(D) to reduce the piston weight
40-In the cam, the distance between the base circle and the nose is called
(A) flank
(B) lobe
(C) lead
(D) lift
ANSWERS:
31-(D), 32-(A), 33-(B), 34-(C), 35-(B), 36-(C), 37-(C), 38-(A), 39-(A), 40-(D)
41-The steering ratio for manual steering of cars is approximately:
(A) 5
(B) 15
(C) 50
(D) 100
42-FIP is driven by
(A) Crank shaft gear
(B) Distributor shaft
(C) Cam shaft screw gear
(D) Cam shaft gear
43-The larger gear wheel used in the final drive is called:
(A) Crown wheel
(B) Sun gear
(C) Pinion wheel
(D) Planet gear
44-The type of lubrication system suitable for racing cars is:
(A) wet sump lubrication system
(B) splash lubrication system
(C) dry sump lubrication system
(D) petrol lubrication system
45-Warpness of cylinder head is caused by:
(A) over heating of cylinder head
(B) over cooling of cylinder head
(C) over tightening of nuts
(D) uneven tightening of nuts
46-Which of the following is not a part of primary circuit of ignition system?
(A) Battery
(B) CB points
(C) Ignition coils thick wire winding
(D) Spark plug
47-“External pressure applied upon a confined fluid is transmitted uniformly in all directions”.
This law is
(A) Pascal’s law
(B) Boyles law
(C) Charle’s law
(D) Avagadro’s law
48-The angle between king pin centre line and vertical in the plane of wheel is called
(A) Steering axis inclination
(B) King pin inclination
(C) Castor
(D) Camber
49-In which engine crank shaft length is maximum?
(A) V-engine
(B) Inline engine
(C) Radial engine
(D) Opposed engine
50-The ratio between BHP and IHP is called
(A) thermal efficiency
(B) engine efficiency
(C) volumetric efficiency
(D) mechanical efficiency
ANSWERS:
41-(B), 42-(A), 43-(A), 44-(C), 45-(A), 46-(D), 47-(A), 48-(C), 49-(B), 50-(D)
51-Important pollutants of the engine exhausts are:
(A) HC, CO2 and H2O
(B) HC, CO and NOX
(C) HC, CO2 and CO
(D) All of these
52-Useful power obtained at the engine flywheel is called:
(A) Indicated power
(B) Frictional power
(C) Mechanical advantage
(D) Brake power
53-Major constituent of CNG (Compressed Natural Gas) is:
(A) Butane
(B) Propane
(C) Ethane
(D) Methane
54-Which of the following device can bring two gears rotating at different speeds to the same
speed for smooth gear shifting?
(A) Throw out bearing
(B) Synchronizer
(C) Idler gear
(D) Inter locking mechanism
55-The pipe connecting fuel tank and FIP is called
(A) High pressure pipe
(B) Over flow pipe
(C) Leak off pipe
(D) Suction pipe
56-Double helical gears are also known as
(A) Herringbone gear
(B) Spur gear
(C) Bevel gear
(D) Spiral gear
57-The narrow space in the cylindrical air horn of the carburetor through which the air passes is:
(A) Float chamber
(B) Venturi
(C) Mixing chamber
(D) None of the above
58-Wear on tyre is more on one side is due to:
(A) incorrect camber angle
(B) low tyre pressure
(C) high tyre pressure
(D) sudden acceleration
59-In a dry sump lubrication system, scavenging pump is used to:
(A) pump oil from sump to tank
(B) pump oil directly to all moving parts
(C) develop additional oil pressure
(D) pump oil from sump to filter
60-The catalyst used in reducing converter is
(A) platinum
(B) rhodium
(C) charcoal
(D) sodium
ANSWERS:
51-(B), 52-(D), 53-(D), 54-(B), 55-(C), 56-(A), 57-(B), 58-(A), 59-(A), 60-(A)
MCQ on Automobile Engineering
1-The type of gear box used in automobile transmission is:
(A) Epicyclic gear box
(B) Constant mesh gear box
(C) Sliding mesh
(D) Synchromesh gear box
2-The suspension movement in which vehicle moves perpendicular the road is:
(A) Bouncing
(B) Rolling
(C) Pitching
(D) None of these
3-Name of the engine which has bore equal to stroke length
(A) Wankel engine
(B) Radial engine
(C) Square engine
(D) Hybrid engine
4-The independent suspension system which uses only lower wishbone
(A) Wishbone type
(B) Mac Pherson strut
(C) Vertical guide
(D) Single strut
5-Which of the following suspension system uses compressors?
(A) Rigid axle
(B) Independent
(C) Vertical guide
(D) Air suspension
6-Write down correct equation:
(A) IHP=BHP+FHP
(B) FHP=BHP+IHP
(C) BHP=IHP+FHP
(D) IHP=BHP-FHP
7-Which of the following spring is used in rigid axle suspension?
(A) Coil spring
(B) Leaf spring
(C) Air spring
(D) Torsion spring
8-The tilt of the vehicle wheels from the vertical
(A) Camber
(B) Castor
(C) Kingpin inclination
(D) Combined angle
9-The ratio of tyre section height to the tyre section width:
(A) Ply rate
(B) Aspect ratio
(C) Tyre ratio
(D) None of the above
10-An engine has swept volume of 600 cc. If compression is 8.5, determine clearance volume.
(A) 40 cc
(B) 60 cc
(C) 80 cc
(D) 100 cc
ANSWERS:
1-(A), 2-(A), 3-(C), 4-(B), 5-(D), 6-(A), 7-(B), 8-(A), 9-(B), 10-(C)
11-Actual power delivered at the crank shaft.
(A) FHP
(B) IHP
(C) BHP
(D) None of the above
12-The process of filling air in tyre is:
(A) Inflation
(B) Deflation
(C) Cracking
(D) None of the above
13-The heart of hydraulic brake system is:
(A) Wheel cylinder
(B) Master cylinder
(C) Adjuster
(D) Brake pedal
14-The process of removing air from hydraulic system is:
(A) Brake adjustment
(B) Brake bleeding
(C) Wheel alignment
(D) Brake alignment
15-The part which connects piston and connecting rod:
(A) Crankpin
(B) Piston pin
(C) Flywheel
(D) Gasket
16-Full form of ABS which is used in vehicle is:
(A) Absolute Braking system
(B) Always Better service
(C) Anti-locking Braking system
(D) None of the above
17-The instrument which show the distance travelled by the vehicle is
(A) Speedometer
(B) Tachometer
(C) Odometer
(D) Lactometer
18-Air bag used in a car is:
(A) Storage of air
(B) Storage of oxygen
(C) For protection of passenger
(D) For air brake
19-The tool used to finish a previously drilled hole is:
(A) Grinder
(B) Reamer
(C) Tap and die
(D) Tube cutter
20-The exhaust valve usually starts opening:
(A) At BDC
(B) At TDC
(C) Before BDC
(D) Before TDC
ANSWERS:
11-(C), 12-(A), 13-(B), 14-(B), 15-(B), 16-(C), 17-(C), 18-(C), 19-(B), 20-(C)
21-Valve clearance is measured by the instrument:
(A) Screw gauge
(B) Slip gauge
(C) Vernier caliper
(D) Feeler gauge
22-Which of the following is an external combustion engine?
(A) Petrol engine
(B) Diesel engine
(C) Steam engine
(D) Gas engine
23-The distance between center line of crank pin and main journal axis is
(A) Crank throw
(B) Valve clearance
(C) Eccentricity
(D) Normal clearance
24-Which of the following valve is used in automobile engine?
(A) Poppet valve
(B) Rotary valve
(C) Sleeve valve
(D) None of these
25-In which of the following lubrication system lubricant oil is mixed with fuel
(A) Spark system
(B) Pressure system
(C) Dry sump
(D) Petroil system
26-The ratio of RPM of crankshaft to the RPM of camshaft is:
(A) 1
(B) 2
(C) 0.5
(D) 3
27-Which of the following is used to measure level of lubricating oil in the oil sump
(A) Oil pressure gauge
(B) Dipstick
(C) Warning light
(D) Timing light
28-Multi point Fuel Injection (MPFI) is used in
(A) Diesel engine
(B) Petrol engine
(C) Steam engine
(D) None of the above
29-To reduce emission of unburned hydrocarbon in the automobile exhaust gas combustion
chamber is designed as
(A) Spherical
(B) Hemispherical
(C) Conical
(D) Cubical
30-The device which is used to maintain speed at varying load condition:
(A) Flywheel
(B) FIP
(C) Governor
(D) Injector
ANSWERS:
21-(D), 22-(C), 23-(A), 24-(A), 25-(D), 26-(B), 27-(B), 28-(B), 29-(B), 30-(C)
31-Following acid is used in a lead acid battery in an automobile
(A) Sulphuric acid
(B) Hydrochloric acid
(C) Nitric acid
(D) Phosphoric acid
32-The color of positive plate in Lead acid battery is
(A) Chocolate brown
(B) Grey
(C) White
(D) Red
33-The device used to convert AC current in the armature coil to DC current is
(A) Yoke
(B) Commutator
(C) Contact breaker
(D) Ballast resistor
34-The instrument used to test short circuit between armature winding in starting motor or
dynamo is
(A) Growler
(B) Multimeter
(C) High rate discharge tester
(D) Stroboscope
35-A four wheeler normally uses battery of:
(A) 10 volt
(B) 12 volt
(C) 20 volt
(D) 1.5 volt
36-The volume between TDC and BDC in a single cylinder engine is
(A) Stroke volume
(B) Swept volume
(C) Total volume
(D) Both (A) and (B)
37-The total number of gears in a differential is
(A) 2
(B) 3
(C) 5
(D) 6
38-Spark plug is used in
(A) SI engine
(B) CI engine
(C) Steam engine
(D) All of the above
39-The cross section of connecting rod is:
(A) I section
(B) L section
(C) D section
(D) T section
40-The test used to know the chemical condition of positive and negative plate is:
(A) Specific gravity test
(B) Open volt test
(C) High discharge test
(D) Cadmium test
ANSWERS:
31-(A), 32-(A), 33-(B), 34-(A), 35-(B), 36-(B), 37-(D), 38-(A), 39-(A), 40-(D)
41-Reason for clutch drag or spin is:
(A) Excessive free pedal play
(B) Damaged pressure plate
(C) Cracked clutch plate
(D) All of the above
42- Speed of the driving gear (A) is 1500 rpm, speed of the driven gear (B), meshing with ‘A’ is
3000 rpm. What is gear ratio?
(A) 2
(B) 0.5
(C) 1.5
(D) 4500
43- Increase of torque in a vehicle is obtained by:
(A) Increasing speed
(B) Decreasing speed
(C) Increasing power
(D) All of the above
44- Which of the following gear box use double de clutching process?
(A) Synchromesh gear box
(B) Sliding mesh
(C) Constant mesh
(D) None of the above
45-The clutch is located between the gear box and the
(A) Engine
(B) Rear axle
(C) Propeller shaft
(D) Differential
46-Camshaft is not required in
(A) 4 stroke petrol engine
(B) 4 stroke diesel engine
(C) 2 stroke engine
(D) None of the above
47-To reduce noise, engine exhaust is connected to the _____
(A) Muffler
(B) Catalytic converter
(C) Supercharger
(D) Turbocharger
48-The main constituent of CNG (Compressed Natural Gas) is
(A) Methane
(B) Ethane
(C) Butane
(D) Propane
49-The reason for the wide use of Aluminium alloy piston is:
(A) Low weight
(B) High thermal conductivity
(C) Increased cooling efficiency
(D) All of the above
50-Working principle of flywheel in engine is
(A) Moment of Inertia
(B) Pascal law
(C) Venturi principle
(D) Charles law
ANSWERS:
41-(A), 42-(A), 43-(B), 44-(C), 45-(A), 46-(C), 47-(A), 48-(A), 49-(D), 50-(A)
51-All the gears in the differential are:
(A) Spur gear
(B) Helical gear
(C) Bevel gear
(D) Double helical gear
52-A tyre is specified as P205/75 R14. The digit 75 stands for
(A) Radius
(B) Diameter
(C) Aspect ratio
(D) Speed rate
53-A battery of 100 AH (Ampere Hour) can give
(A) 10 A current for 10 H
(B) 20 A for 5 H
(C) 25 A for 4 H
(D) All of the above
54-The type of suspension system used in two wheeler is
(A) Rigid axle
(B) Mac Pherson
(C) Swinging half axle
(D) Telescopic shock absorber
55-Which of the following battery test uses hydrometer?
(A) Open volt test
(B) Cadmium test
(C) High discharge test
(D) Specific gravity test
56-Which of the following works according to Venturi Principle?
(A) FIP
(B) Feed pump
(C) Carburetor
(D) Injector
ANSWERS:
51-(C), 52-(C), 53-(D), 54-(D), 55-(D), 56-(C)
Automobile Engineering MCQ Questions
1-Crank case dilution is:
(A) Dilution of lubricating oil
(B) Addition of water in crank case
(C) Dilution of unburned diesel in crank case
(D) None of the above
2-The top ring on the piston is known as:
(A) Ring grove
(B) Compression ring
(C) Oil ring
(D) Scrapper ring
3-The purpose of Feeler gauge is:
(A) Measuring the small gap
(B) Measuring the length of a rod
(C) Measuring the diameter of a cylinder
(D) Measuring length of a beam
4-Viscosity of the oil is the measure of it’s:
(A) Resistance flow
(B) Velocity flow
(C) Temperature flow
(D) Current flow
5-The cylinder block of heavy engine is made of:
(A) High carbon steel
(B) Nickel or chromium steel
(C) Cast iron
(D) Medium carbon steel
6-The standard firing order for an in-line 6 cylinder IC engine is:
(A) 1-5-3-6-2-4
(B) 1-3-5-4-2-6
(C) 1-6-5-4-2-3
(D) 1-4-5-2-3-6
7-In 4-stroke cycle engine, the gear ratio of camshaft to crankshaft is:
(A) 1:1
(B) 1:2
(C) 1:6
(D) 1:8
8-Which is more viscous lubricating oil?
(A) SAE 20
(B) SAE 40
(C) SAE 50
(D) SAE 70
9-Scavenging is usually done to increase:
(A) Thermal efficiency
(B) Speed of the engine
(C) Less fuel consumption
(D) Power output
10-All the four wheel drive automobiles has:
(A) Water cooled engine
(B) Air cooled engine
(C) Four stroke engine
(D) Two differentials
ANSWERS:
1-(C), 2-(B), 3-(A), 4-(A), 5-(C), 6-(A), 7-(B), 8-(D), 9-(D), 10-(D)
11-The radiator is usually made of:
(A) Bronze
(B) Cast iron
(C) Steel
(D) Copper
12-Air standard efficiency of an IC engine depends on:
(A) Power ratio
(B) Velocity ratio
(C) Fuel used
(D) Compression ratio
13-The materials used for cylinder head is generally:
(A) Aluminium
(B) High carbon steel
(C) Mild steel
(D) Cast iron
14-The volume swept by the piston in moving from TDC to BDC is called:
(A) Displacement volume
(B) Clearance volume
(C) Engine capacity
(D) Total volume
15- The swept volume of all the pistons inside the cylinders of a reciprocating engine in a single
movement from top dead centre (TDC) to bottom dead centre (BDC).
(A) Engine displacement
(B) Valve capacity
(C) Fuel tank capacity
(D) Rocker arm capacity
16-Engine torque is transmitted to the gear box through
(A)Gear box
(B) Belt
(C) Chain
(D) Clutch
17-Speedometer is usually connected with the:
(A) Fan belt
(B) Dynamo
(C) Front wheel
(D) Rear wheel
18-The specific gravity of fully charged lead acid battery is:
(A) 1.000
(B) 1.120
(C) 1.265
(D) 1.500
19-A compressed air brake is a type of
(A) Mechanical brake
(B) Friction brake
(C) Hand brake
(D) Vacuum assisted brake
20-Following indicates Multi grade oil
(A) SAE 20W50
(B) SAE 120
(C) SAE 90
(D) APISF
ANSWERS:
11-(D), 12-(D), 13-(A), 14-(A), 15-(A), 16-(D), 17-(C), 18-(C), 19-(B), 20-(A)
21-The parking brake generally acts on
(A) Propeller shaft
(B) Front wheels
(C) Rear wheels
(D) Front and rear wheels
22-Baffles are provided on engine to:
(A) Reduce fuel consumption
(B) Improve engine performance
(C) Improve heat transfer rate
(D) Reduce the knocking effect
23-The tachometer is used to measure the:
(A) Engine oil viscosity
(B) Engine compression
(C) Engine temperature
(D) Engine rpm
24-When the top of the wheel is fitted inward then it is called
(A) King pin inclination
(B) Positive camber
(C) Negative camber
(D) Caster angle
25-Following type of rear axle is used in a car and light commercial vehicles are:
(A) Semi-floating axle
(B) Full floating axle
(C) Three quarter Floating axle
(D) None of the above
26-___ are provided in the clutch smooth engagement.
(A) Coil springs
(B) Cushion springs
(C) Torsion springs
(D) Spring basic disc
27-A ring gear is provided around the engine flywheel:
(A) To start the engine using self starter
(B) To operate the valves
(C) To maintain better engine speed
(D) To maintain the water pump speed
28-___ serves to adjust the length of the propeller shaft when demanded by the rear axle
movement.
(A) Universal joint
(B) Cap joints
(C) Corner joint
(D) Slip joint
29-Oil sump is made of
(A) Cast iron
(B) Alluminium alloy
(C) Zinc sheet
(D) Pressed steel sheet
30-The term BTDC stands for:
(A) Below Top Dead Centre
(B) Before Top Dead Centre
(C) Back Top Dead Centre
(D) Balance Top Dead Centre
ANSWERS:
21-(C), 22-(C), 23-(D), 24-(C), 25-(A), 26-(B), 27-(A), 28-(A), 29-(D), 30-(B)
Automobile Engineering – Multiple Choice Questions (MCQ) with
Answers
1-The compression ratio for practically diesel engine lies usually in the range of
(a) 3-5
(b) 6-8
(c) 10-15
(d) 16-22
(Ans: D)
2-A four stroke petrol engine theoretically operates on
(a) Otto cycle
(b) Brayton cycle
(c) Joule cycle
(d) Bell Coleman cycle
(Ans: A)
3-BHP of an engine is determined by a formula
(a) 2πNT / 4500
(b) 4πNT / 4500
(c) πNT / 4500
(d) 2πRNT / 4500
(Ans: A)
4-The radiator tubes are manufactured from
(a) Cast iron
(b) Aluminium
(c) Brass
(d) Steel
(Ans: C)
5-Which of the following is not the effect of detonation?
(a) High operating temperature
(b) Loss in efficiency and power output
(c) Loud and pulsating noise
(d) High local stresses
6-The brake shoes are curved to conform to the inner diameter of the
(a) Tyre
(b) Wheel
(c) Pedal
(d) Brake drum
(Ans: D)
7-The material used for the piston of the modern cars is
(a) Brass
(b) Cast Iron
(c) Aluminium alloy
(d) Steel
(Ans: C)
8-IHP minus FHP is equal to
(a) BHP
(b) SAF HP
(c) m.e.p
(d) None of the above
(Ans: A)
9-In a petrol engine the tendency for knocking decreases with
(a) increase in charge temperature
(b) Increase in cylinder size
(c) Increase in compression ratio
(d) Increase in delay period
(Ans: D)
10-Morse test can be used on
(a) Low horsepower engines only
(b) Variable speed engines only
(c) Multi-cylinder engines only
(d) Water cooled engines only
(Ans: C)
11-The piston road of a steam engine is usually connected to the cross head by means of
(a) Bolted joint
(b) Riveted joint
(c) Universal joint
(d) Cotter joint
(Ans: D)
12-The firing order in an internal combustion engine is the
(a) Order in which cylinders are numbered
(b) Order in which cylinders are placed
(c) Direction of rotation of crank shaft
(d) Sequence in which the cylinders deliver power stroke
(Ans: D)
13-The purpose of glow plug inside the combustion chamber is to
(a) Control idle engine speed
(b) Provide light inside the combustion chamber
(c) Add heat to the pre-combustion chamber
(d) Warm the fuel
(Ans: D)
15-A radiator like object is an example of
(a) Heat exchanger
(b) Defrosting device
(c) Expansion valve
(d) Heat pump
(Ans: A)
15-In petrol engines the sparking increases
(A) Pressure
(B) Volume
(C) Temperature of the product of combustion
(D) Both (A) and (B)
(Ans: B)
16-Air standard efficiency of an I.C. engine depends on
(A) Speed
(B) Compression ratio
(C) Fuel
(D) all of the above
(Ans: B)
17-Aluminium alloys for engine/automobile parts are reinforced to increase their
(a) Strength
(b) Wear resistance
(c) Elastic modulus
(d) Density
(Ans: B)
Multiple Choice Questions (MCQ) with Answers on Thermal power
plants
1-The following is the correct order of energy conversion in thermal power plants
(A) Chemical energy – Mechanical energy – Electrical energy
(B) Mechanical energy – Chemical energy – Electrical energy
(C) Wind energy – Mechanical energy – Electrical energy
(D) Heat energy – Electrical energy – Mechanical energy
(Ans: A)
2-In thermal power plant, turbine is placed
(A) Before boiler
(B) In between boiler and generator
(C) After generator
(D) Any of the above
(Ans: B)
3-In the steam condensing power plants
(A) The amount of energy extracted per kg of steam is increased
(B) The steam, converted into water, can be re-circulated with the help of pump
(C) Both (A) and (B)
(D) None of the above
(Ans: C)
4-In thermal power plants, the dust of flue gases is trapped by
(A) Precipitator
(B) Economizer
(C) Superheated
(D) Air preheater
(Ans: A)
5-The path of flue gases in Thermal power plant is
(A) Boiler – Economizer – Superheater– Air preheater
(B) Boiler – Superheater – Air preheater – Economizer
(C) Boiler – Air preheater – Superheater – Economizer
(D) Boiler – Superheater – Economizer – Air preheater
(Ans: D)
6-The following is not a component of Thermal power plant
(A) Condenser
(B) Cooling tower
(C) Turbine
(D) Fuel tank
(Ans: D)
7-With the increase in _____ the efficiency obeys the ‘law of diminishing returns’
(A) Pressure
(B) Temperature
(C) Volume
(D) All of the above
(Ans: A)
8- With the increase in _____ the efficiency obeys the ‘straight line law’
(A) Pressure
(B) Temperature
(C) Volume
(D) All of the above
(Ans: B)
9-Fluid fuels are handled by
(A) Burners
(B) Stokers
(C) Both (A) and (B)
(D) None of the above
(Ans: C)
10-For steam boilers, the fuel(s) is (are) mainly
(A) Bituminous coal
(B) Fuel oil
(C) Natural gas
(D) All of the above
11-The most common method(s) used for burning of coal is (are)
(A) Striker firing
(B) Pulverized fuel firing
(C) Both (A) and (B)
(D) None of the above
(Ans: C)
12-A ‘stroker’ is a power operated fuel ___ mechanism
(A) Burning
(B) Feeding
(C) Handling
(D) Storage
(Ans: B)
13-The spreader stroker, secondary air is supplied
(A) Through holes
(B) Through nozzles
(C) From bottom side
(D) Any of the above
(Ans: B)
14-The following is not a pulverized fuel burner.
(A) Tangential burner
(B) Turbulent burner
(C) Cyclone burner
(D) Radial burner
(Ans: D)
15-In which of the following type of burner, liquid fuel is raised by capillary action?
(A) Wick burners
(B) Re-circulating burner
(C) Rotating cup burner
(D) All of the above
(Ans: A)
16-A Fluidised bed may be defined as the bed of ______ particles
(A) Liquid
(B) Solid
(C) Both (A) and (B)
(D) None of the above
(Ans: B)
17-The following is (are) ash handling system(s)
(A) Hydraulic system
(B) Pneumatic system
(C) Steam jet system
(D) All of the above
(Ans: D)
18-The following is dry type dust collectors
(A) Spray type
(B) Packed type
(C) Impingement type
(D) Cyclone separator
(Ans: D)
19-The major constituent of fly ash is
(A) Silicon dioxide
(B) Aluminium oxide
(C) Calcium oxide
(D) Magnesium oxide
(Ans: A)
20-The draught produced by the chimney if due to the ____ difference between the column of hot
gases inside the chimney and the cold air outside.
(A) Temperature
(B) Potential
(C) Density
(D) None of the above
Theory of Machines – Objective Questions and Answers
1-The product of moment of inertia and angular velocity is known as:
(A) angular torque
(B) kinetic energy
(C) angular momentum
(D) none of the above
2-The frictional torque transmitted in the case of flat pivot bearing for uniform pressure is:
(A) µWR
(B) 1/3 µWR
(C) 2/3 µWR
(D) ½ µWR
3-Which of the following is an example of friction clutch?
(A) disc
(B) cone
(C) plate
(D) all of the above
4-The module is defined as the ratio of:
(A) number of teeth to the pitch circle diameter
(B) pitch circle diameter to number of teeth
(C) circumference of the pitch circle to number of teeth
(D) none of the above
5-The locus of a point on the circumference of a circle, which rolls without slipping on a fixed
straight line is known as:
(A) cycloid
(B) involute
(C) epicycloid
(D) hypocycloid
6-When the axes of the first and last wheels of a compound gear train are co-axial, then the train is
also known as:
(A) non reverted gear train
(B) epicyclic gear train
(C) reverted gear train
(D) none of the above
7-The follower of a cam has
(A) uniform acceleration and retardation
(B) cycloidal motion
(C) simple harmonic motion
(D) any one of the above
8-Which of the following is a spring loaded governor
(A) Proell governor
(B) Porter governor
(C) Watt governor
(D) Hartnell governor
9-A stud bolt is:
(A) thread on both ends
(B) thread on one end without head
(C) thread on one end with head
(D) none of the above
10-The length of belt used in a cross belt drive is ___ than that used in open belt drive.
(A) double
(B) equal
(C) less
(D) greater
11-Idler gear wheels are used in compound gear train to
(A) change the direction
(B) increase the velocity
(C) double the velocity
(D) reduce the velocity
12-A machine is used to be self-locking if efficiency of machine is
(A) equal to 100%
(B) equal to 50%
(C) more than 50%
(D) less than 50%
13-Maximum efficiency of a screw jack is a function of:
(A) Effort
(B) Angle of friction
(C) Load lifted
(D) Helix angle
14-Diametral pitch of a gear wheel is defined as the ratio of:
(A) Number of teeth to pitch circle diameter
(B) Pitch circle diameter to number of teeth
(C) Circumference of pitch circle to number of teeth
(D) Number of teeth to circumference of pitch circle diameter
15-The smallest circle drawn to the cam profile from the cam center is known as:
(A) Prime circle
(B) Pitch circle
(C) Base circle
(D) Pitch circle
16-In cam and follower, the period of dwell is the period:
(A) during which the cam rotates
(B) during which the follower remains stationary during some finite rotation of cam
(C) during which the follower moves from lower portion to highest position
(D) during which the follower moves from its higher position to lowest position
17-In case of pivot bearing, the rubbing velocity is
(A) zero at center and maximum at the outer radius
(B) maximum at the center and zero at the outer radius
(C) uniform throughout the contact area
(D) none of the above
18-The frictional torque transmitted in the case of flat pivot bearing for uniform wear is equal to:
(A) µWR
(B) 1/3 µWR
(C) ½ µWR
(D) 2/3 µWR
19-The maximum efficiency of a Screw jack is given by (φ = Angle of friction)
(A) (1 + cosφ) / (1 – cosφ)
(B) (1 – cosφ) / (1 + cosφ)
(C) (1 – sinφ) / (1 + sinφ)
(D) (1 – tanφ) / (1 + tanφ)
20-If T1 and T2 are the tensions on the tight side and slack side of belt drive and ‘θ’ is the angle of
contact, then the ratio of tension is given by:
(A) T1/T2 = eµθ
(B) T1/T2 = 1/eµθ
(C) T1/T2 = µeθ
(D) T1/T2 = µθ
21-The fast pulley is a pulley which
(A) runs fast
(B) runs independently
(C) is a grooved pulley
(D) is fitted on the shaft
22-The actual difference caused between the surface speed of the belt and pulley is
(A) Creep
(B) Slip
(C) Dressing
(D) None of the above
23-The jockey pulley or idler pulley is fitted:
(A) near the driver pulley on the tension side of the belt
(B) near the driven pulley on the tension side of the belt
(C) near the driver pulley on the slack side of the belt
(D) near the driven pulley on the slack side of the belt
24-In which of the following gear, the teeth are cut at an angle to the axis of rotation?
(A) Spur gear
(B) Helical gear
(C) Hypoid gear
(D) Bevel gear
25-The size of the gear is usually specified by:
(A) Diametrical pitch
(B) Pitch circle diameter
(C) Addendum circle
(D) Dedendum circle
ANSWERS:
1-(C), 2-(C), 3-(D), 4-(B), 5-(A), 6-(C), 7-(D), 8-(D), 9-(A), 10-(D), 11-(A), 12-(D), 13-(B), 14-(A), 15-(C),
16-(B), 17-(A), 18-(C), 19-(C), 20-(A), 21-(D), 22-(B), 23-(C), 24-(B), 25-(B)
MCQ Theory of Machines
1-A link must be a
(A) Rigid body
(B) Resistant body
(C) Rigid as well as resistant body
(D) None of the above
(Ans: C)
2-In a slider crank chain, the numbers of possible inversions are
(A) Three
(B) Four
(C) Five
(D) Six
(Ans: B)
3-The gears having teeth parallel to the axis of the shaft are known as
(A) Bevel gears
(B) Helical gears
(C) Worm and worm wheels
(D) Spur gears
(Ans: D)
4-The mean kinetic energy of a flywheel is equal to
(A) Iω2
(B) Iω2 /2g
(C) Iω2/2
(D) Iω2/4
(Ans: C)
5-Which one of the following is a spring controlled centrifugal governor
(A) Hartnell governor
(B) Porter governor
(C) Proell governor
(D) Watt governor
(Ans: A)
6-In gears, interference takes place when
(A) The tip of a tooth of a mating gear digs into the portion between base and root circles
(B) Gears do not move smoothly in the absence of lubrication
(C) Pitch of the gear is not same
(D) Gear teeth are undercut
(Ans: A)
7-Flat belt is limited for the transmission of
(A) Moderate power from one pulley to another in which distance between pulleys is no criterion
(B) Moderate power from one pulley to another when the two pulley are placed more than 8m apart
(C) Moderate power from one pulley to another when the two pulley are not more than 8m apart
(D) All of above
(Ans: C)
8-Which one of the following is true for involute gears?
(A) Interference is inherently absent
(B) Variation in centre distance of shafts increases radial force
(C) A convex flank is always in contact with concave flank
(D) Pressure angle is constant throughout the teeth engagement
(Ans: D)
9-The type of coupling used to join two shafts whose axes are neither in same straight line nor
parallel but intersect is
(A) Flexible coupling
(B) Chain coupling
(C) Universal coupling
(D) Flange coupling
(Ans: C)
10-In spur gears, the circle on which the involute profile is generated is called the
(A) Base circle
(B) Addendum circle
(C) Pitch circle
(D) Clearance circle
11-A system of masses rotating in different parallel planes is in dynamic balance if the resultant
(A) Force is equal to zero
(B) Couple is equal to zero
(C) Force and the resultant couple are both equal to zero
(D) Force is numerically equal to the couple
(Ans: C)
12-The product of circular pitch and diametral pitch is
(A) π
(B) 2π
(C) π/2
(D) D/T
(Ans: A)
13-In involute gears, the pressure angle is
(A) Dependant on the size of teeth
(B) Dependant on the size of gears
(C) Always constant
(D) Always variable
(Ans: C)
14-The amount of energy absorbed by a flywheel is determined from the
(A) torque-crank angle diagram
(B) acceleration-crank angle diagram
(C) speed-space diagram
(D) speed-energy diagram
(Ans: A)
15-A wire rope is designated as 6×19 standard hoisting. The numbers 6×19 represent
(A) Diameter in millimetre × length in meter
(B) Diameter in centimetre × length in meter
(C) Number of strands × number of wires in each strand
(D) Number of wires in each strand × number of strands
(Ans: C)
16-A mechanism is an assembly of
(A) Two links
(B) Three links
(C) Four links or more than four links
(D) all of the above
(Ans: C)
17-The relation between the number of pairs ‘p’ forming a kinematic chain and the number of links
‘l’ is
(A) l = 2p – 2
(B) l = 2p – 3
(C) l = 2p – 4
(D) l = 2p – 5
(Ans: C)
18-Which of the following is an inversion of double slider crank chain?
(A) Coupling rod of a locomotive
(B) Pendulum pump
(C) Oscillating cylinder engine
(D) Elliptical trammels
(Ans: D)
19-In a clock mechanism, the gear train used to connect minute hand to hour hand, is
(A) Epicyclic gear train
(B) Reverted gear train
(C) Compound gear train
(D) Simple gear train
(Ans: B)
20-Belt drive is an example of
(A) Rigid link
(B) Flexible link
(C) Fluid link
(D) None of the above
(Ans: B)
Multiple Choice Questions on Brakes
1-Brake is used to ____ the energy possessed by a moving system or mechanism by means of
friction.
(A) Absorb
(B) Release
(C) Minimize
(D) Maximize
2-The energy absorbed by the brake is
(A) Kinetic energy
(B) Potential energy
(C) both (A) and (B)
(D) None of the above
3-In hoists and elevators, the brake absorbs the
(A) Kinetic energy
(B) Potential energy
(C) both (A) and (B)
(D) None of the above
4-The energy absorbed by the brake is converted into
(A) Heat energy
(B) Electrical energy
(C) Mechanical energy
(D) Kinetic energy
5-Mechanical brakes are operated by
(A) Levers
(B) Springs
(C) Pedals
(D) Any of the above
6-Internal and External expanding shoe brakes are
(A) Radial brakes
(B) Axial brakes
(C) Both (A) and (B)
(D) None of the above
7-Which of the following is (are) an electrical brake?
(A) Magnetic particle brake
(B) Hysteresis brake
(C) Eddy current brake
(D) All of the above
8-Brake capacity depends upon
(A) The unit pressure between braking surfaces
(B) The contacting area of braking surface
(C) The coefficient of friction
(D) All of the above
9-The braking torque depends upon
(A) The mass of the system
(B) Initial velocity of the system
(C) Final velocity of the system
(D) All of the above
10-Which type of brake is commonly employed in railway trains?
(A) Block brake
(B) Internal expanding brake
(C) Band brake
(D) Any of the above
11- When the intensity of pressure between the block and brake drum is uniform, the angle of
contact between the block and brake drum is less than
(A) 30°
(B) 45°
(C) 60°
(D) 90°
12-For anticlockwise rotation of brake drum in block brake, the actuating force or braking effort is
___ that of clockwise direction.
(A) More than
(B) Less than
(C) Equal to
(D) Any of the above
13-In block brake with long shoe, the semi-block angle is
(A) 2θ
(B) θ
(C) θ/2
(D) None of the above
14-The brake drum is made of
(A) Cast iron
(B) Steel
(C) Aluminium
(D) All of the above
15-In block brakes with long shoe, equivalent coefficient of friction is given by
(A) µ[(4sinθ)/(2θ+sin2θ)]
(B) µ[(2sinθ)/(2θ+sin2θ)]
(C) µ[(4sinθ)/(θ+sin2θ)]
(D) µ[(4sinθ)/(2θ+sinθ)]
Where, 2θ= block angle, µ=Coefficient of friction
16-In case of the pivoted shoe brake, the location of the pivot can be selected in such a way that
the moment of frictional force about the pivot is
(A) Zero
(B) One
(C) Maximum
(D) Minimum
17-In brakes, the wear occurs on the
(A) Friction lining
(B) Brake drum
(C) Both (A) and (B)
(D) None of the above
18-Pivoted shoe brakes are mainly used in
(A) Automobiles
(B) Railway trains
(C) Hoists and Cranes
(D) All of the above
19-In internal expanding shoe brake, the actuating force is usually provided by means of
(A) A hydraulic cylinder
(B) A cam mechanism
(C) Both (A) and (B)
(D) None of the above
20-An internal expanding shoe brake is mainly used in
(A) Vehicle
(B) Conveyor
(C) Hoist
(D) All of the above
21-In band brake, the ratio of band tensions (P1/P2) is given by
(A) eµθ
(B) eµθ
(C) µθ
(D) None of the above
22-Band brakes are used in
(A) Bucket conveyors
(B) Hoists
(C) Chain saws
(D) All of the above
23-Following brake can never become self-locking
(A) Band brake
(B) Block brake
(C) Disk brake
(D) All of the above
24-Following is (are) the type(s) of shape(s) for the pads of caliper disk brakes
(A) Annular
(B) Circular
(C) Both (A) and (B)
(D) None of the above
25-The torque capacity (Mt) of disk brake is given by
(A) µPRf
(B) µ/PRf
(C) µP/Rf
(D) µRf /P
Where, µ=coefficient of friction, P=Actuating force, Rf=friction radius
26-When the temperature increases, the coefficient of friction
(A) Decreases
(B) Increases
(C) remains same
(D) Any of the above
ANSWERS:
1-(A), 2-(C), 3-(B), 4-(A), 5-(D), 6-(A), 7-(D), 8-(D), 9-(D), 10-(A), 11-(B), 12-(A), 13-(B), 14-(D), 15-(A),
16-(A), 17-(A), 18-(C), 19-(C), 20-(D), 21-(A), 22-(D), 23-(C), 24-(C), 25-(A), 26-(A)
Multiple Choice Questions on Chain Drive
1-A chain can be defined as a series of links connected by
(A) Pin joints
(B) Riveted joints
(C) Ball joints
(D) Bolted joints
2-The chain drive is intermediate between
(A) Belt and rope drives
(B) Rope and gear drives
(C) Belt and gear drives
(D) None of the above
3-Following is true for chain drive
(A) The chain does not slip
(B) Chain drive is positive drive
(C) Chain drive does not require initial tension
(D) All of the above
4-Which of the following can be used for non-parallel shafts?
(A) Bevel gear
(B) Worm gear
(C) Quarter Turn belt drive
(D) All of the above
5-Chain drives are used in
(A) Bicycle
(B) Motorcycle
(C) Automobile
(D) All of the above
6-Chain drives are recommended to transmit power up to
(A) 25 kW
(B) 50 kW
(C) 100 kW
(D) 500 kW
7-Link chains are used in
(A) Low capacity hoists
(B) Winches
(C) Hand operated cranes
(D) All of the above
8-Following chain is (are) used for conveyor applications
(A) Block chains
(B) Roller chains
(C) Both (A) and (B)
(D) None of the above
9-Following is power transmission chain
(A) Block chains
(B) Roller chains
(C) Both (A) and (B)
(D) None of the above
10-Following is not a part of roller chain
(A) Bushing
(B) Inner link plate
(C) Centre link plate
(D) Outer link plate
11-In roller chain, the bush and the pin form
(A) Ball joint
(B) Swivel joint
(C) Riveted joint
(D) None of the above
12-In roller chain, the rolling friction reduces
(A) Wear
(B) Frictional power loss
(C) Improves the efficiency of the chain drive
(D) All of the above
13-A chain is designated as 16A, its pitch is
(A) 8 mm
(B) 12.7mm
(C) 16mm
(D) 25.4mm
14-Braking load is defined as the maximum
(A) Shear load
(B) Compressive load
(C) Tensile load
(D) All of the above
15-The length of the chain (L) is expressed as
(A) Ln x p
(B) Ln x v
(C) Ln x n
(D) Ln x z
Where, Ln = number of links in the chain, p = pitch, v = linear velocity, z = number of teeth on sprocket, n
= velocity in rpm
16-An additional link provided in the chain is called
(A) Offset link
(B) Substitute link
(C) Extra link
(D) None of the above
17-The power transmitted (P) in kW by the roller chain can be expressed by
(A) P1v/1000
(B) P1/1000 v
(C) v/1000 P1
(D) P1v x 1000
Where, P1 = Allowable tension, v = average velocity of chain (m/s)
18-The power rating of the roller chain is obtained on the basis of following failure criteria
(A) Wear
(B) Fatigue
(C) Impact
(D) All of the above
19-___ is a stick slip phenomenon between the pin and the bushing.
(A) Wear
(B) Fatigue
(C) Galling
(D) Impact
20-For satisfactory performance of roller chains, the center distance between the sprockets
should be provided at least a ___ wrap angle on the smaller sprocket.
(A) 60°
(B) 90°
(C) 120°
(D) 150°
21-Too loose a chain causes vibrations called
(A) Whirling
(B) Whipping
(C) Shaking
(D) None of the above
22-The minimum number of teeth on the driving sprocket is
(A) 7
(B) 17
(C) 27
(D) 37
23-The speed reduction of a single stage chain drive should not be more than
(A) 5:1
(B) 7:1
(C) 10:1
(D) 15:1
24-The expected service life of chains is
(A) 10,000 hrs
(B) 15,000 hrs
(C) 20,000 hrs
(D) 25,000 hrs
25-The efficiency of well lubricated chain drive is from
(A) 90% to 92%
(B) 92% to 94%
(C) 94% to 96%
(D) 96% to 98%
26-Following is ‘Type-A’ method of lubrication in chains
(A) Disk lubrication
(B) Drip lubrication
(C) Oil stream lubrication
(D) None of the above
27-The silent chain is also known as
(A) Inverted tooth chain
(B) Block chain
(C) Roller chain
(D) All of the above
28-Following is true for silent chain
(A) Used for high speed applications
(B) It is smooth and noiseless
(C)Expensive than roller chain
(D) All of the above
29-Following has polygonal effect
(A) Gear drive
(B) Belt drive
(C) Chain drive
(D) Rope drive
30-Follwowing is a type of silent chain
(A) Reynolds chain
(B) Morse chain
(C) Both (A) and (B)
(D) Kinematic chain
ANSWERS:
1-(A), 2-(C), 3-(D), 4-(D), 5-(D), 6-(C), 7-(D), 8-(A), 9-(B), 10-(C), 11-(B), 12-(D), 13-(D), 14-(C), 15-(A),
16-(A), 17-(A), 18-(D), 19-(C), 20-(C), 21-(B), 22-(B), 23-(B), 24-(B), 25-(D), 26-(B), 27-(A), 28-(D), 29(C), 30-(C)
Multiple Choice Questions with Answers on Metallurgy
1-Annealing improves
(A) Grain size
(B) Mechanical properties
(C) Electrical properties
(D) All of above
(Ans: D)
2-The product from blast furnace is called
(A) Cast Iron
(B) Wrought Iron
(C) Pig Iron
(D) Steel
(Ans: C)
3-Which is closest to the purest form of the iron?
(A) Cast Iron
(B) Wrought Iron
(C) Pig Iron
(D) Steel
(Ans: B)
4-Eutectic reaction for iron- carbon system occurs at
(A) 600° C
(B) 723° C
(C) 1147° C
(D) 1490° C
(Ans: C)
5-The crystal structure of α iron is
(A) Simple Cubic
(B) Face centered cubic
(C) Body centered cubic
(D) Close packed hexagonal
(Ans: C)
6-Steel can be hardened quickly by the process of
(A) Induction hardening
(B) Nitriding
(C) Cyaniding
(D) Carburizing
(Ans: A)
7-Materials are softened by
(A) Carburising
(B) Tempering
(C) Normalizing
(D) Annealing
(Ans: B)
8-A peritectic reaction is defined as
(A) Two solids reacting to form a liquid
(B) Two solids reacting not to form a liquid
(C) A liquid and solid reacting to form another solid
(D) Two solids reacting to form a third solid
(Ans: C)
9-The structures which have the highest packing of atoms are
(A) hexagonal close packed lattice
(B) body central cubic lattice
(C) simple cubic lattice
(D) none of the above
(Ans: A)
10-Which of the following metal has lowest melting point?
(A) Antimony
(B) Tin
(C) Silver
(D) Zinc
(Ans: B)
11-Metal with hexagonal close packed structure is
(A) silver
(B) Iron
(C) Magnesium
(D) Aluminium
(Ans: C)
12-Austempering is the heat treatment process used to obtain greater
(A) hardness
(B) toughness
(C) brittleness
(D) ductility
(Ans: B)
13-wt.% of carbon in mild steels
(A) <0.008
(B) 0.008-0.3
(C) 0.3-0.8
(D) 0.8-2.11
(Ans: B)
14-Eutectoid product in Fe-C system is called
(A) Pearlite
(B) Bainite
(C) Ledeburite
(D) Spheroidite
(Ans: A)
15-Stainless steel is so called because of its ______.
(A) High strength
(B) High corrosion resistance
(C) High ductility
(D) Brittleness
(Ans: B)
16-The percentage of carbon in gray cast iron is in the range of
(A) 0.25 to 0.75 %
(B) 1.25 to 1.75 %
(C) 3 to 4%
(D) 8 to 10 %
(Ans: C)
Manufacturing Processes MCQ
1-V belt run in ___ degree v-groove.
(A) 20°
(B) 40°
(C) 55°
(D) 60°
2-The ___ is the operation of forming the edge of a component into roll by bending the sheet metal
in order to strengthen the edge and to provide smoothness to its surface.
(A) Bending
(B) Curling
(C) Lancing
(D) Forming
3-The back gear system of a lathe is used to:
(A) Reduce the spindle speed
(B) Increase the spindle speed
(C) Only used in thread cutting
(D) Regulate the spindle speed
4-in which type of hammer both ends are sharpened and cross to the handle:
(A) Stretching hammer
(B) Creasing hammer
(C) Bullet hammer
(D) Setting hammer
5-____ is an operation of closing down the edges of the plates and heads of the rivets to form a
metal to metal joint.
(A) Caulking
(B) Hammering
(C) Fullering
(D) Riveting
6-For effective cutting of steel with hand hack saw, which coolant is suitable
(A) Water
(B) Soluble oil
(C) Compressed air
(D) Kerosene
7-Included Morse taper angle is
(A) 1°
(B) 3°
(C) 7°
(D) 12°
8-The front face of the chuck jaws are stepped. The purpose of these steps is to:
(A) Add appearance
(B) Reduce weight
(C) Have increasing gripping power
(D) Hold larger diameter work
9-A ball peen hammer is specified by
(A) The weight
(B) The length of the handle
(C) The shape of the face
(D) The material of the head
10-The distance between the tip of the electrode and the parent metal where arc strike is called:
(A) Arc length
(B) Arc gap
(C) Arc distance
(D) Arc width
ANSWERS:
1-(B), 2-(B), 3-(A), 4-(B), 5-(A), 6-(B), 7-(B), 8-(D), 9-(C), 10-(A)
11-Which defects occurs if cast iron is welded without Pre-heating?
(A) Porosity
(B) Undercut
(C) Crack
(D) Blow hole
12-Gun metal is an alloy of copper, zinc and
(A) Aluminum
(B) Tin
(C) Lead
(D) Antimony
13-Drawing out is a ___ operation.
(A) Finishing
(B) Suiting
(C) Fitting
(D) Forging
14-___ are used to remove clinkers from the fire.
(A) Shovel
(B) Tongs
(C) Hammer
(D) None of the above
15-What is the purpose of steady rest used in lathe?
(A) Additional clamp support for the head stroke
(B) Additional support for the work
(C) Additional support for the tool
(D) To reduce job speed
16-The purpose of using sine bar is to:
(A) Measure the length of the job
(B) Find the angle of taper job
(C) Check the flatness of job
(D) Check the level of the job
17-Honing is used to finish:
(A) Flat surface
(B) Shaft
(C) Hole
(D) Irregular surface
18-The roughness grade number N12 has ___ microns.
(A) 1.6
(B) 12.5
(C) 25
(D) 50
19-The total amount of permissible variation in the basic size of shaft is called:
(A) Fit
(B) Allowance
(C) Fundamental deviation
(D) Tolerance
20-___ is a process of shaping metals and alloys into semi-finished products by passing them
between two rolls rotating in opposite direction.
(A) Extrusion
(B) Drawing out
(C) Rolling
(D) Hobbing
ANSWERS:
11-(C), 12-(B), 13-(D), 14-(B), 15-(B), 16-(B), 17-(C), 18-(D), 19-(D), 20-(C)
Objective Questions and Answers on Manufacturing Processes
1-Which one of the following welding processes uses non consumable electrode
(A) Gas metal arc welding
(B) Submerged arc welding
(C) Gas Tungsten arc welding
(D) Flux coated arc welding
(Ans: C)
2-The method of joining metal surface by introducing a non ferrous alloy with melting point above
400° C is known as
(A) Soldering
(B) Brazing
(C) Welding
(D) none of the above
(Ans: B)
3-Cutting forces at the cutting tool can be measured by
(A) A dynamometer
(B) A viscosity meter
(C) A sine bar
(D) A combination set
(Ans: A)
4-Extrusion is a process of
(A) Pushing the heated billet of metal through an orifice
(B) Producing a hole by a punch
(C) Making cup shaped parts from the sheet metal
(D) None of the above
(Ans: A)
5-The clearance angle is provided on the tools with a view to
(A) Strength the tool
(B) Shear off the metal
(C) Facilitate easy flow of chips
(D) Prevent the tool from rubbing on workpiece
(Ans: D)
6-By cold working of materials, the fatigue strength
(A) increases
(B) decreases
(C) remains same
(D) none of the above
(Ans: A)
7-Investment casting is used for
(A) shapes which are made by difficulty using complex patterns in sand casting
(B) mass production
(C) shapes which are very complex and intricate and can’t be cast by any other method
(D) there is nothing like investment casting
(Ans: C)
8-Blow holes are casting defects
(A) which occur due to some sand shearing from the cope surface
(B) which takes the form of internal voids of surface depression due to excessive gaseous material not
able to escape
(C) which occur due to discontinuity in metal casting resulting from hindered contraction
(D) caused by two streams of metals that are too cold to fuse properly
(Ans: B)
9-Laser is produced by
(A) graphite
(B) ruby
(C) diamond
(D) emerald
(Ans: B)
10-The major problem in hot extrusion is
(A) design of punch
(B) design of die
(C) wear and tear of die
(D) wear of punch
(Ans: C)
11-File used for wood work is
(A) single cut file
(B) double cut file
(C) rasp cut file
(D) none of the above
(Ans: C)
12-An example of fusion welding is
(A) arc welding
(B) gas welding
(C) thermit welding
(D) forge welding
(Ans: A)
13-Gases used in tungsten inert gas welding are
(A) hydrogen and oxygen
(B) CO₂ and H₂
(C) argon and neon
(D) argon and helium
(Ans: D)
14-Oxy-acetylene flame is used to weld
(A) steel
(B) copper alloys
(C) stainless steel
(D) cast iron
(Ans: A)
15-Orthogonal cutting system is also known as
(A) one-dimensional cutting system
(B) two-dimensional cutting system
(C) three-dimensional cutting system
(D) none of the above
(Ans: B)
16-In metal cutting operations discontinuous chips are produced while machining
(A) brittle material
(B) ductile material
(C) hard material
(D) soft material
(Ans: A)
17-Term CLA (Centre Line Average) is used for
(A) surface roughness (finish)
(B) surface hardness
(C) cutting tool hardness
(D) none of the above
(Ans: A)
18-Knurling is an operation of
(A) cutting smooth collars
(B) under cutting
(C) roughing the surface for hand grip
(D) none of the above
(Ans: C)
19-Poor fusion in a welded is due to
(A) high welding speed
(B) dirty metal surface
(C) improper current
(D) lack of flux
(Ans: C)
20-Counterboring is the operation of
(A) enlarging the end of a hole cylindrically
(B) cone-shaped enlargement of the end of a hole
(C) smoothing and squaring the surface around a hole
(D) sizing and finishing a hole
(Ans: A)
21-A connecting rod is made by
(A) casting
(B) drawing
(C) forging
(D) extrusion
(Ans: C)
22-Preheating before welding is done to
(A) make the steel softer
(B) burn away oil, grease, etc, from the plate surface
(C) prevent plate distortion
(D) prevent cold cracks
(Ans: D)
23-In Electro- Discharge Machining (EDM), the tool is made of
(A) Copper
(B) High speed steel
(C) Cast iron
(D) Plain carbon steel
(Ans: A)
24-Which of the following is a single point cutting tool?
(A) Hacksaw blade
(B) Milling cutter
(C) Grinding wheel
(D) Parting tool
(Ans: D)
25-In ASA System, if the tool signature is 8-6-5-5-10-15-2-mm, then the side rake angle will be
(A) 5°
(B) 6°
(C) 8°
(D) 10°
(Ans: B)
26-Cold working of metal increases
(A) tensile strength
(B) hardness
(C) yield strength
(D) all of the above
(Ans: D)
27-Seamless tube can be produced by
(A) two high rolling mill
(B) ring rolling combined with stretch forming
(C) piercing
(D) steam hammering forging
(Ans: C)
28-In electro chemical machining (ECM) the material removal is due to
(A) corrosion
(B) erosion
(C) fusion
(D) ion displacement
(Ans: D)
29-Crater wear occurs mainly due to
(A) abrasion
(B) diffusion
(C) oxidation
(D) adhesion
(Ans: B)
30-Tool life of the cutting tool is most affected by
(A) Cutting speed
(B) Tool geometry
(C) Cutting feed and depth
(D) Microstructure of material being cut
(Ans: A)
31-Metal in machining operation is removed by
(A) Tearing chips
(B) Shearing the metal across a zone
(C) Distortion of metal
(D) Cutting the metal across a zone
(Ans: B)
32-Usual casting method for making dental crowns
(A) Sand casting
(B) Die casting
(C) Continuous casting
(D) Investment casting
(Ans: D)
33-The mechanism of material removal in EDM process is
(A) Melting and Evaporation
(B) Melting and Corrosion
(C) Erosion and Cavitation
(D) Cavitation and Evaporation
(Ans: A)
34-If the metals are ductile and the cutting speed is high, then
(A) Continuous chips are formed
(B) Discontinuous chips are formed
(C) Continuous chips with built-up edges are formed
(D) None of these
(Ans: A)
Strength of Materials – Multiple Choice Questions (MCQ) with
Answers
1-If a bar of length, l, cross-sectional area, A, weighing, W, is fixed vertically at its upper end, its
elongation is equal to
(A) Wl/2AE
(B) Wl/AE
(C) 2AE/2Wl
(D) AE/Wl
(Ans: A)
2-An open ended thin cylinder shell, subjected to uniform internal pressure will be subjected to
(A) Hoop stress only
(B) Longitudinal stress only
(C) Both hoop and Longitudinal stress
(D) None of the above
(Ans: C)
3-In a cantilever, the bending moment is maximum at the
(A) Free end
(B) Mid span
(C) Fixed end
(D) None of the above
(Ans: C)
4-If w is the uniformly distributed load per unit length on a cantilever, the maximum bending
moment on the cantilever of length l is equal to
(A) Wl
(B) Wl/2
(C) W 2l/2
(D) Wl2/2
(Ans: D)
5-The bending stress at the neutral axis is
(A) Tensile
(B) Compressive
(C) Shear
(D) Zero
(Ans: D)
6-In terms of theoretical stress concentration factor (Kt) and fatigue stress concentration factor
(Kf), the notch sensitivity ‘q’ is expressed as
(A) (Kf -1) / (Kt -1)
(B) (Kf -1) / (Kt +1)
(C) (Kt -1) / (Kf -1)
(D) (Kf +1) / (Kt +1)
(Ans: A)
7-The equivalent length of a column with both ends fixed is equal to
(A) L
(B) L/2
(C) 2L
(D) L/√2
(Ans: B)
8-The Poisson’s ratio for most of the material is close to
(A) 0.5
(B) 0.4
(C) 0.25
(D) 0.2
(Ans: C)
9-A ductile structure is defined as one for which the plastic deformation before fracture
(A) is smaller than the elastic deformation
(B) vanishes
(C) is equal to the elastic deformation
(D) is much larger than the elastic deformation
(Ans: D)
10-A Mohr’s circle reduces to a point when the body is subjected to
(A) pure shear
(B) uniaxial stress only
(C) equal and opposite axial stresses on two mutually perpendicular planes, the planes being free of
shear
(D) equal axial stresses on two mutually perpendicular planes, the planes being free of shear
(Ans: D)
11-Under torsion, brittle materials generally fail
(A) along a plane perpendicular to its longitudinal axis
(B) in the direction of minimum tension
(C) along surfaces forming 45° angle with the longitudinal axis
(D) not in any specific manner
(Ans: C)
12-Mohr’s scale is used in connection with
(A) composition of metal
(B) hardness of materials
(C) wear criterion of metals
(D) tensile strength of metals
(Ans: B)
13-The outside diameter of a hollow shaft is twice its inside diameter. The ratio of its torque
carrying capacity to that of a solid shaft of the same material and the same outside diameter is
(A) 15/16
(B) 3/4
(C) 1/2
(D) 3/16
(Ans: A)
14-If the shear force at a section of a beam under bending is equal to zero then the bending
moment at the section is
(A) zero
(B) maximum
(C) minimum
(D) minimum or maximum
(Ans: B)
15-In terms of Poisson’s ratio (μ) the ratio of Young’s Modulus (E) to Shear Modulus (G) of Elastic
material is
(A) 2(1+μ)
(B) 2(1- μ)
(C) 0.5(1+ μ)
(D) 0.5(1- μ)
(Ans: A)
16-A transmission shaft subjected to bending loads must be designed on the basis of
(A) maximum normal stress theory
(B) maximum shear stress theory
(C) maximum normal stress and maximum shear stress theories
(D) fatigue strength
(Ans: A)
17-The Young’s modulus of elasticity of a material is 2.5 times its modulus of rigidity. The
Poisson’s ratio for the material will be
(A) 0.25
(B) 0.33
(C) 0.50
(D) 0.75
(Ans: A)
18-Angle of twist of a shaft of diameter ‘d’ is inversely proportional to
(A) d
(B) d2
(C) d3
(D) d4
(Ans: D)
19-True stress-strain curve need to be corrected after
(A) Elastic limit
(B) Yield limit
(C) Tensile strength
(D) No need to correct
(Ans: C)
20-Time dependent yield is known as
(A) Fracture
(B) Creep
(C) Buckling
(D) Fatigue
(Ans: B)
Mechanical Engineering MCQ Questions
1-Cross head is used to connect
(A) Piston rod and small end of connecting rod
(B) Piston and crank
(C) Connecting rod and crank
(D) None of the above
2-Screw jack is operated by
(A) using tommy bar
(B) Handle
(C) Lever
(D) Spanner
3-A solid having four equal equilateral triangular faces
(A) Cube
(B) Square prism
(C) Tetrahedron
(D) Square
4-If the surface is ___ to the plane of projection, the resulting projection will be the true shape of
surface.
(A) Parallel
(B) Perpendicular
(C) Inclined
(D) Any of the above
5-Eccentrcity is always less than one for
(A) Ellipse
(B) Parabola
(C) Hyperbola
(D) Helix
6-The curve generated by the point on the circumference of a circle, rolling along inside the
another circle, is called:
(A) Hypocycloid
(B) Epi-cycloid
(C) Cycloid
(D) Involute
7-For getting higher hardness of pencil leads, ___ is added more.
(A) Graphite
(B) Kaolin
(C) Carbon
(D) Wax
8-Journal bearing can only support:
(A) Axial load
(B) Radial load
(C) Inclined load
(D) None of the above
9-An Oldham coupling connects two shafts, when they are:
(A) Intersecting
(B) Parallel
(C) Co-axial
(D) Inclined
10-In a screw thread profile, the ___ diameter is equal to the major diameter minus single depth.
(A) Core
(B) Crest
(C) Pitch
(D) Nominal
ANSWERS:
1-(A), 2-(C), 3-(C), 4-(A), 5-(A), 6-(A), 7-(A), 8-(A), 9-(B), 10-(C)
11-The beam compass is also known as:
(A) Wing compass
(B) Divider
(C) Trammel
(D) Hermaphrodite caliper
12-Which flux is known as killed spirit?
(A) Muriatic acid
(B) Hydrochloric acid
(C) Resin
(D) Zinc chloride
13-While normalizing the components should be cooled:
(A) by dipping in water
(B) by forced air
(C) by quenching in oil
(D) in still air to room temperature
14-Which head is used to set any required angle in the combination set?
(A) Square set
(B) Centre head
(C) Protractor head
(D) Rule
15-___ is the process of cutting a closed outside contour of a shape:
(A) Notching
(B) Slitting
(C) Piercing
(D) Blanking
16-Pipe size is generally specified by its:
(A) Outer diameter
(B) Inner diameter
(C) Outer diameter and wall thickness
(D) Inner diameter and wall thickness
17-___ is used to close an internally threaded pipe:
(A) Cap
(B) Nipple
(C) Flange
(D) Plug
18-One British thermal unit is ___ calories:
(A) 453.6 calories
(B) 252 calories
(C) 4200 calories
(D) 1.8 calories
19-Which of the following is an example of first order lever?
(A) Wheel barrow
(B) Common balance
(C) Tongs
(D) Nut cracker
20-When a solid immersed in liquid, the upward thrust experienced by it is called:
(A) Floatation
(B) Buoyancy
(C) Relative density
(D) Density
ANSWERS:
11-(C), 12-(D), 13-(D), 14-(C), 15-(A), 16-(B), 17-(D), 18-(B), 19-(B), 20-(B)
21-Which steel is used to make magnet?
(A) High carbon steel
(B) High speed steel
(C) Vanadium steel
(D) Cobalt steel
22-Which is not the law of limiting friction?
(A) Directly proportional to the normal reaction
(B) Dependent on the thickness of the surface in contact
(C) Dependent upon the surface in contact
(D) Independent of the area of the surface
23-Principle of lever:
(A) load X load arm = effort X effort arm
(B) load X load arm = effort arm
(C) load effort
(D) load X effort arm = effort X load
24-Very small circles are drawn by means of
(A) Wing compass
(B) Small bow compass
(C) Drop bow compass
(D) Pro-circle
25-The length of an arrow head used for dimensioning is ___ times its width.
(A) one
(B) two
(C) three
(D) four
26-___ is the part of circle between any two points on the circumference.
(A) Sector
(B) Semi-circle
(C) Segment
(D) Arc
27-For ___ files the width is constant.
(A) Flat
(B) Round
(C) Square
(D) Hand
28-Feeler gauge are used to:
(A) Check the radius of a curved surface
(B) Check the thickness of plate
(C) Check the gap between the mating surface
(D) Checking taper
29-A metal plate of thickness less than ___ is considered as sheet.
(A) 1 mm
(B) 2 mm
(C) 3 mm
(D) 4 mm
30-The size of the vice is usually specified by:
(A) The length of movable jaw
(B) The width of the jaw
(C) The maximum distance that can be opened between the jaw
(D) Weight of the vice
ANSWERS:
21-(D), 22-(B), 23-(A), 24-(B), 25-(C), 26-(D), 27-(A), 28-(C), 29-(C), 30-(B)
31-Keys are classified according to the relative position of the shaft and
(A) Length of shaft
(B) Diameter of hub hole
(C) Cross section of the key
(D) Diameter of the shaft
32-The coordination number of FCC crystal structure is:
(A) 4
(B) 6
(C) 8
(D) 12
33-According to Gibb’s phase rule, the number of degrees of freedom of a two component, three
phase system is:
(A) 0
(B) 1
(C) 2
(D) 3
34-Which one of the following is correct for Berger’s vector in screw dislocation?
(A) perpendicular to the dislocation line
(B) parallel to the dislocation line
(C) inclined to the dislocation line
(D) opposite to the dislocation line
35-In high speed steels, the alloying element with maximum percentage is:
(A) Vanadium
(B) Nickel
(C) Tungsten
(D) Silicon
36-In electric arc welding, arc is created by:
(A) current
(B) voltage
(C) frequency
(D) contact resistance
37-Tool life is affected mainly with:
(A) depth of cut
(B) feed
(C) cutting speed
(D) coolant
38-The surface roughness on a drawing is represented by:
(A) Circles
(B) Triangles
(C) Squares
(D) zig-zag line
39-The optimum value of the helix angle of a drill is:
(A) 10°
(B) 20°
(C) 30°
(D) 40°
40-Auto-collimator is used for measuring:
(A) Roughness
(B) Flatness
(C) Automobile balancing
(D) Small angle
ANSWERS:
31-(C), 32-(D), 33-(B), 34-(B), 35-(C), 36-(D), 37-(C), 38-(B), 39-(C), 40-(D)
41-The density of one liter of petrol of specific gravity 0.7 is:
(A) 600 kg/m3
(B) 600 N/m3
(C) 700 kg/m3
(D) 700 N/m3
42-Whirl pool in a river is an example of:
(A) Forced vortex flow
(B) Free vortex flow
(C) Irrotational flow
(D) Viscous flow
43-Bernoulli’s equation is
(A) Momentum equation
(B) Energy equation
(C) Force equation
(D) Mass equation
44-The equation of motion for a viscous fluid is known as:
(A) Euler’s equation
(B) Bernoulli’s equation
(C) Reynold’s equation
(D) Navier-Stroke’s equation
45-Darcy’s friction factor in a pipe flow corresponds to a Reynold’s number of 2000 is:
(A) 0.016
(B) 0.032
(C) 0.32
(D) 0.16
46-Pitot tube is used for measuring:
(A) discharge
(B) velocity
(C) viscosity
(D) pressure
47-The slip in a reciprocating pump is:
(A) positive
(B) negative
(C) zero
(D) positive or negative
48-Modern Francis turbine is essentially a
(A) Tangential flow turbine
(B) Mixed flow turbine
(C) Axial flow turbine
(D) Radial flow turbine
49-The ratio of pressure force to inertia force is known as:
(A) Reynold’s number
(B) Froude’s number
(C) Weber number
(D) Euler’s number
50-Series operation of a centrifugal pump results in:
(A) high head
(B) high discharge
(C) high speed
(D) reduced power consumption
ANSWERS:
41-(C), 42-(B), 43-(B), 44-(A), 45-(B), 46-(B), 47-(B), 48-(B), 49-(D), 50-(A)
Questions on Mechanical Engineering
1-Hydraulic ram works on the principle of
(A) positive displacement action
(B) centrifugal action
(C) reciprocating action
(D) inertia force of water in the supply line
2-Hydraulic intensifier is used for
(A) storing energy of a fluid in the form of pressure energy
(B) increasing the pressure intensity of a liquid
(C) transfer and lift heavy loads
(D) augment the supply of water
3-The capacity of a hydraulic accumulator is defined as:
(A) maximum amount of energy it can store
(B) maximum discharge which can deliver
(C) the volume of liquid which can store
(D) The maximum height to which it is capable of lifting the liquid
4-The pump to be used for pumping highly viscous fluids belongs to
(A) Screw pump
(B) Turbine pump
(C) Centrifugal pump
(D) Plunger pump
5-A direction control valve designated by DC 3/2 implies:
(A) 3 position and 2 port
(B) 3 port and 2 positions
(C) 3 supply port and 2 exhaust port
(D) 3 exhaust port and 2 supply ports
6-The function of check valve is:
(A) To allow the flow of fluid in one direction only
(B) To allow the flow of fluid in both directions
(C) To regulate the flow
(D) To check the flow
7-A simply supported beam of span 10 m carrying a concentrated load of 1000 N at the mid span
will have the maximum bending moment of
(A) 10000 Nm
(B) 5000 Nm
(C) 2500 Nm
(D) 500 Nm
8-The ratio of maximum shear stress to average shear stress for a beam with circular section is:
(A) 3:1
(B) 2:1
(C) 3:2
(D) 4:3
9-When a closed coiled spring is subjected to axial load, its axial deflection is directly
proportional to
(A) Diameter of the wire
(B) Modulus of rigidity of the spring material
(C) Modulus of elasticity of the spring material
(D) Mean radius of the coil of the spring
10-A universal joint is an example of
(A) Higher pair
(B) Lower pair
(C) Rolling pair
(D) Sliding pair
ANSWERS:
1-(D), 2-(B), 3-(A), 4-(A), 5-(B), 6-(A), 7-(C), 8-(D), 9-(D), 10-(B)
11-Coriolis component of acceleration is always:
(A) parallel to the link
(B) Perpendicular to the link
(C) Radially outward along the link
(D) Coincide with the axis of link
12-Axial thrust is minimum in case of
(A) Helical gear
(B) Bevel gear
(C) Double helical gear
(D) Miter gear
13-Whenever the follower moves with simple harmonic motion, the velocity diagram is:
(A) Parabolic
(B) Sinusoidal
(C) Hyperbolic
(D) Cosine curve
14-In case of multi-disc clutch, if there are 3 discs on the driving shaft and 2 disc on the drive
shaft, then the total number of pairs of contacting surfaces is equal to
(A) 1
(B) 4
(C) 5
(D) 6
15-A key connecting to a flange coupling to a shaft likely to fail in
(A) Tension
(B) Shear
(C) Torsion
(D) Bending
16-Second law of thermodynamics defines a property known as:
(A) Internal energy
(B) Entropy
(C) Temperature
(D) Enthalpy
17-The entropy change in a reversible adiabatic process is
(A) Zero
(B) < 0
(C) > 0
(D) ≤ 0
18-The efficiency of a Carnot cycle operating between the temperature limits of 327° and 27° is:
(A) 92%
(B) 60%
(C) 50%
(D) 70%
19-Which of the following processes is not associated with Diesel cycle?
(A) Constant volume
(B) Constant pressure
(C) Adiabatic
(D) isothermal
20-Morse test is conducted only on:
(A) Variable speed engine
(B) Low power engine
(C) Multi-cylinder engine
(D) Water cooled engine
ANSWERS:
11-(B), 12-(C), 13-(B), 14-(B), 15-(B), 16-(B), 17-(A), 18-(A), 19-(A), 20-(C)
MCQ Questions on Mechanical Engineering
1-The ignition quality of a petrol engine is expressed as:
(A) Cetane number
(B) Octane number
(C) SAE rating
(D) API gravity
2-The throttling process in a refrigeration cycle is:
(A) isentropic
(B) isobaric
(C) isochoric
(D) isenthalpic
3-For the same temperature limits, the COP of a refrigerator is 4, then the COP of a heat pump
equals
(A) 2
(B) 3
(C) 4
(D) 5
4-In a critical path, slack is equal to
(A) Project time
(B) Minimum project time
(C) Maximum project time
(D) Zero
5-Which of the following statements is true for the term Break Even Point (B.E.P.) analysis?
(A) It calculates the profit at B.E.P.
(B) Net revenue at B.E.P. is calculated for calculating profit %
(C) It calculates the volume of output at which neither loss nor profit occurs
(D) It is used to forecast the net sales with 10% profit
6-Which of the following technique in quality control helps to keep the number of defects or
imperfections per unit of product?
(A) X chart
(B) C chart
(C) R chart
(D) P chart
7-Which of the following terms is most appropriate to describe the basic elements of movements
or fundamental hand motions of the work cycle?
(A) Work study
(B) Tool study
(C) Therbligs
(D) Macroscopic motion study
8-Thermal power stations are located near:
(A) River / Oceans
(B) Collieries
(C) Metro cities
(D) Wet fertile land
9-Which of the following deals with the comfort of human body to get the maximum output and
minimum strain?
(A) Physiology
(B) Psychology
(C) Economics
(D) Ergonomics
10-The structure of Gamma Iron formed between 910°C and 1400°C is:
(A) BCC
(B) FCC
(C) HCP
(D) None of the above
ANSWERS:
1-(B), 2-(D), 3-(D), 4-(D), 5-(C), 6-(B), 7-(C), 8-(B), 9-(D), 10-(B)
11-Purest form of iron is:
(A) Pig iron
(B) Cast iron
(C) Wrought iron
(D) Puddled iron
12-In which of the following welding technique a separate electrode is used to maintain the
electric arc which should not touch the work/filler material?
(A) Manual arc welding
(B) Submerged arc welding
(C) MIG
(D) TIG
13-Which of the following tool materials is the hardest, next to diamond?
(A) Tungsten carbide
(B) CBN (Carbon Boron Nitride)
(C) Ceramics
(D) Titanium carbide
14-In Flexible Manufacturing System:
(A) Machines are flexible
(B) Cutting tools are flexible
(C) Machines as well as cutting tools are flexible
(D) Work-machine schedule in flexible during production
15-Which of the following is true when the rake angle of a cutting edge increases?
(A) Tool strength reduces and chip flow resistance increases
(B) Tool strength increases and smooth chip flow
(C) Tool strength reduced and chip flow resistance reduces
(D) Tool strength increases and chip flow resistance increase
16-Speed of air craft can be measured by:
(A) Tachometer
(B) Pressure gauge
(C) Pitot tube
(D) Ultrasonic flow meter
17-Which of the following sense the elastic deformation of a hollow tube with elliptical cross
section and bent in the form of an arc during pressure measurement?
(A) Piezometer tube
(B) Bordon’s tube pressure gauge
(C) U-tube manometer
(D) Differential manometer
18-Cavitation in centrifugal pump results in:
(A) Damage of impeller due to pitting
(B) Highest possible efficiency
(C) Increasing fluid temperature
(D) Increasing fluid pressure
19-Maximum deflection of a cantilever beam with point load ‘P’ at free end is:
(A) (PL3)/(3EI) at fixed end
(B) (PL3)/(3EI) at free end
(C) (PL4)/(8EI) at fixed end
(D) (PL4)/(32EI) at fixed end
20-Simple theory of elastic bending (with usual notation) is:
(A) M/I = f/Y = E/R
(B) M/I = Y/f = E/R
(C) I/M = Y/f = E/R
(D) I/M = f/Y = E/R
ANSWERS:
11-(C), 12-(D), 13-(B), 14-(D), 15-(C), 16-(C), 17-(B), 18-(A), 19-(B), 20-(A)
21-Ratio of stress to strain is:
(A) % of strain
(B) % of stress
(C) Poisson’s ratio
(D) Modulus of elasticity
22-Thread height (H) of ISO screw thread is related to its pitch (P) by:
(A) H = 0.500P
(B) H = 0.960P
(C) H = 0.860P
(D) H = 1.732P
23-Which of the following operations will produce the lowest surface roughness?
(A) Milling
(B) Lapping
(C) Grinding
(D) Reaming
24-In the hole basis system which one of the following represents a press fit?
(A) H7 p6
(B) H7 h7
(C) H7 f7
(D) H7 g6
25-Unit of Overall Heat Transfer Coefficient is:
(A) W/m2K
(B) W/mK
(C) W/K
(D) W/m
26-As temperature increases the conductivity of a metal
(A) increases
(B) decreases
(C) no change
(D) first increases then decreases
27-Galvanization is a process of applying a protective coating on iron with:
(A) Copper
(B) Tin
(C) Aluminium
(D) Zinc
28-The metal present in chlorophyll:
(A) Iron
(B) Zinc
(C) Magnesium
(D) Copper
29-Identify the physical quantity having no dimensions
(A) strain
(B) stress
(C) pressure
(D) modulus of elasticity
30-When a bullet is fired using a gun, it moves back with a velocity called
(A) critical velocity
(B) muzzle velocity
(C) terminal velocity
(D) recoil velocity
ANSWERS:
21-(D), 22-(C), 23-(B), 24-(A), 25-(A), 26-(B), 27-(D), 28-(C), 29-(D), 30-(D)
31-The working principle of Venturi meter is
(A) Bernoulli’s principle and continuity equation
(B) Archimedes principle
(C) Torricelli’s theorem
(D) Boyle’s law
32-What is the change in Kinetic Energy (KE) of a body if its mass ‘m’ and velocity ‘v’ is doubled?
(A) KE becomes 2 times
(B) KE becomes 4 times
(C) KE becomes 6 times
(D) KE becomes 8 times
33-The Euler’s load for a column is 1 MN and crushing load is 1.5 MN. The Rankine load is
(A) 1 MN
(B) 0.6 MN
(C) 1.5 MN
(D) 2.5 MN
34-The shape of bending moment diagram for a uniform cantilever beam carrying uniformly
distributed load over its length is
(A) a hyperbola
(B) a straight line
(C) an ellipse
(D) a parabola
35-Steady flow occurs when:
(A) velocity does not change
(B) pressure does not change
(C) conditions change gradually with time
(D) conditions do not change with time at any point
36-The depth of center of pressure in rectangular lamina of 3m deep fully immersed in a liquid
having one side in line with free surface is:
(A) 1m
(B) 1.5m
(C) 2m
(D) 2.5m
37-Pressure in Pascal at a depth of 1 m below the free surface of water will be:
(A) 1 Pa
(B) 9810 Pa
(C) 98.1 Pa
(D) 981 Pa
38-A solid shaft is subjected to a bending moment and twisting moment of 3kNm and 4kNm
respectively. The equivalent bending moment is
(A) 4 kNm
(B) 3 kNm
(C) 3.5 kNm
(D) 4.5 kNm
39-The buckling load is maximum for a column if:
(A) one end of the column is fixed and other end is free
(B) both ends of the column are hinged
(C) both ends of the column are fixed
(D) one end of the column is hinged and other end is free
40-Two shafts are made of the same material. The diameter of first is twice that of second. The
ratio of power which can be transmitted by first shaft and second is
(A) 1/2
(B) 1/4
(C) 1/8
(D) 1/16
ANSWERS:
31-(A), 32-(D), 33-(B), 34-(D), 35-(D), 36-(C), 37-(B), 38-(A), 39-(C), 40-(A)