9/29/21, 11:06 AM
Test 1: Elements/Terms (40 pts): Attempt review
Dashboard / My courses / ME465-P4 / Midterm Examination / Test 1: Elements/Terms (40 pts)
Started on Wednesday, 29 September 2021, 8:38 AM
State Finished
Completed on Wednesday, 29 September 2021, 9:04 AM
Time taken 26 mins 9 secs
Marks 21/40
Grade 53 out of 100
Question 1
What is the term as the ratio of the volume at the end of heat addition to the volume at the start of heat addition?
Incorrect
Mark 0 out of 1
a.
volumetric ratio

b. compression ratio
c.
cut-off ratio
d. air-fuel ratio
Question 2
Which does not belong to the group?
Correct
Mark 1 out of 1
a.
air injection system
b. time injection system
c.

gas admission system
d. mechanical injection system
Question 3
The fuel in diesel engine is normally injected at pressure of
Incorrect
Mark 0 out of 1
a.
20 - 25 kg/cm2

b. 50 - 80 kg/cm2
c.
90 - 130 kg/cm2
d. 5 - 15 kg/cm2
Question 4
The specific fuel consumption of a petrol engine compared to diesel engine of same H.P. is
Incorrect
Mark 0 out of 1
a.
less or more depending on operating conditions
b. less
c.

same
d. more
Question 5
As a result of detonation in an IC engine, following parameter attains very high value
Incorrect
Mark 0 out of 1
a.
peak pressure
b. peak temperature
c.
rate of rise of temperature

d. rate of rise of pressure
Question 6
Is the load of an installation or system at the receiving terminal average over a specified interval of time
Correct
Mark 1 out of 1
a.
peak load
b. demand
c.

output
d. load curve
Question 7
Peak load for a period of time divided by installed capacity:
Correct
Mark 1 out of 1
a.
utilization factor

b. capacity factor
c.
demand factor
d. load factor
Question 8
In loop scavenging, the top of the piston is
Incorrect
Mark 0 out of 1
a.
slanted
b. contoured
c.
flat

d. depressed
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Question 9
Test 1: Elements/Terms (40 pts): Attempt review
The ratio of the average load to the peak load over a designated period of time is called:
Correct
Mark 1 out of 1
a.
reactive factor
b. plant use factor
c.
diversity factor
d. load factor
Question 10

Scavenging is usually done to increase
Incorrect
Mark 0 out of 1
a.
speed
b. power output
c.
thermal efficiency

d. fuel consumption
Question 11
A branched system of pipes to carry waste emissions away from the piston chambers of an internal combustion engine is called:
Correct
Mark 1 out of 1
a.
exhaust deflection pipe
b. exhaust nozzle
c.
exhaust pipes
d. exhaust manifold
Question 12

An engine indicator is used to determine the following
Correct
Mark 1 out of 1
a.
mep and IHP

b. volume of cylinder
c.
speed
d. temperature
Question 13
The air-fuel ratio of the petrol engine is controlled by
Correct
Mark 1 out of 1
a.
carburettor

b. governor
c.
fuel pump
d. injector
Question 14
For the same compression ratio
Correct
Mark 1 out of 1
a.
Otto cycle is more efficient than the Diesel

b. both Otto and Diesel cycles are, equally efficient
c.
Diesel cycle is more efficient than Otto
d. compression ratio has nothing to do with efficiency
Question 15
Leaking of a fluid between a cylinder and its piston during operation.
Incorrect
Mark 0 out of 1
a.
blow by
b. back pressure
c.

turbo charging
d. scavenging
Question 16
In the opposed piston diesel engine, the combustion chamber is located
Correct
Mark 1 out of 1
a.
above the piston
b. any when
c.
between the pistons

d. below the piston
Question 17
Air standard efficiency of a diesel engine depends on
Correct
Mark 1 out of 1
a.
torque
b. fuel
c.
speed
d. compression ratio
Question 18

Reserve capacity of a plant is given by:
Correct
Mark 1 out of 1
a.
plant capacity - maximum demand

b. plant capacity x (1 - load factor)
c.
maximum demand - average load
d. plant capacity - average load
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Question 19
Test 1: Elements/Terms (40 pts): Attempt review
Is the ratio between maximum demand and connected load.
Correct
Mark 1 out of 1
a.
demand factor

b. diversity factor
c.
capacity factor
d. use factor
Question 20
Diesel cycle consists of:
Correct
Mark 1 out of 1
a.
Isentropic, isothermal, constant volume, constant pressure process
b. Two constant volume, one constant pressure, one isothermal process
c.
Two constant pressure, one constant volume, one isentropic process
d. Two isentropic, one constant volume, one constant pressure process
Question 21

A heat engine utilizes the
Correct
Mark 1 out of 1
a.
high heat value of oil

b. calorific value of oil
c.
mean heat value of oil
d. low heat value of
Question 22
In a diesel engine fuel is injected:
Correct
Mark 1 out of 1
a.
At the beginning of compression stroke
b. After the end of compression stroke
c.
Before the end of compression stroke

d. At the end of compression stroke
Question 23
The output of a diesel engine can be increased without increasing the engine revolution or size in following way
Incorrect
Mark 0 out of 1
a.
supercharging
b. heating incoming air
c.
feeding more fuel
d. scavenging
Question 24

The term scavenging is generally associated with
Incorrect
Mark 0 out of 1
a.
2-stroke cycle engines
b. high efficiency engines
c.
diesel engines
d. 4-stroke cycle engines
Question 25

Compression loss in IC engines occurs due to
Correct
Mark 1 out of 1
a.
all of the above

b. use of thick head gasket
c.
leaking piston rings
d. clogged air-inlet slots
Question 26
Loss of power is due to:
Incorrect
Mark 0 out of 1
a.
Poor compression

b. Restricted exhaust
c.
Low injection pressure
d. Clogging of air cleaner
Question 27
The rating of a diesel engine, with increase in air inlet temperature, will
Correct
Mark 1 out of 1
a.
increase parabolically
b. increase linearly
c.
decrease linearly

d. decrease parabolically
Question 28
Which of the following medium is compressed in a Diesel engine cylinder
Incorrect
Mark 0 out of 1
a.
fuel alone
b. air alone
c.
air and lub oil
d. air and fuel
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Question 29
Test 1: Elements/Terms (40 pts): Attempt review
The working cycle in case of four stroke engine is completed in following number of revolutions of crankshaft
Correct
Mark 1 out of 1
a.
2

b. 1
c.
1/2
d. 4
Question 30
Air fuel ratio at which a petrol engine cannot work is
Correct
Mark 1 out of 1
a.
8:1
b. 20 : 1 and less
c.

10 : 1
d. 15 : 1
Question 31
The maximum load consumed or produced by a unit or grouped of units in a stated period of time.
Correct
Mark 1 out of 1
a.
peak load

b. load curve
c.
connected load
d. load factor
Question 32
A stoichiometric air-fuel ratio is
Incorrect
Mark 0 out of 1
a.
rich mixture for idling
b. rich mixture for over loads
c.
lean mixture

d. chemically correct mixture
Question 33
A graph showing the power consumed versus the time.
Incorrect
Mark 0 out of 1
a.
peak load
b. load curve
c.
chronological load curve

d. load duration curve
Question 34
Which of the following is false statement. Excess quantities of sulphur in diesel fuel are objectionable because it may cause the following
Correct
Mark 1 out of 1
a.
formation of hard coating on piston skirts
b. piston ring and cylinder wear
c.
detonation

d. oil sludge in the engine crank case
Question 35
Ignition of the air fuel mixture in the intake of the exhaust manifold:
Incorrect
Mark 0 out of 1
a.
backfire
b. back pressure
c.
exhaust pressure
d. backlash
Question 36

Foundation are preferably built of concrete In the proportions of what measures of Portland cement:sand:crushed stone?
Incorrect
Mark 0 out of 1
a.
2:3:5
b. 2:4:6
c.
1:2:4
d. 1:2:3
Question 37

Brake mean effective pressure is higher than theoretical mean effective pressure on account of:
Incorrect
Mark 0 out of 1
a.
poor cooling system
b. engine high speed
c.
engine friction losses
d. high compression ratio
Question 38

A diesel engine has
Incorrect
Mark 0 out of 1
a.
4 valves
b. 3 valves
c.
1 valve
d. 2 valves
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Question 39
Test 1: Elements/Terms (40 pts): Attempt review
The calorific value of gaseous fuels is expressed in terms of
Incorrect
Mark 0 out of 1
a.

kcal/kg
b. kcal
c.
kcal/m3
d. kcal/m2
Question 40
Prony brake is used for testing of:
Incorrect
Mark 0 out of 1
a.
small engines

b. engines having small flywheel
c.
high speed engines
d. large engines
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