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Free download in PDF IC Engine Short Questions and Answers for competitive exams. These short objective type questions with answers are very important for competitive exams as well as Board exams. These short solved questions or quizzes are provided by Gkseries.
41
The following volume of air is required for consuming 1 liter of fuel by a four stroke engine
[A]
1 m3
[B]
5 m3
[C]
5-6 m3
[D]
9-10 m3
42
A 5 BHP engine running at full load would consume diesel of the order of
[A]
0.3 kg/hr
[B]
1 kg/hr
[C]
3 kg/hr
[D]
5 kg/hr
43
Diesel engine can work on very lean air fuel ratio of the order of 30 : 1. A petrol engine can also work on such a lean ratio provided
[A]
it is properly designed
[B]
best quality fuel is used
[C]
can not work as it is impossible
[D]
flywheel size is proper
Answer: can not work as it is impossible
44
A diesel engine has
[A]
1 valve
[B]
2 valves
[C]
3 valves
[D]
4 valves
45
A hmh flame speed is obtained in diesel engine when air fuel ratio is
[A]
uniform throughout the mixture
[B]
chemically correct mixture
[C]
about 3-5% rich mixture
[D]
about 10% rich mixture
Answer: about 10% rich mixture
46
Volatility of diesel fuel oil is
[A]
minimum temperature to which oil is heated in order to give off inflammable vapours in sufficient quantity to ignite momentarily when brought in contact with a flame
[B]
temperature at which it solidifies or congeals
[C]
it catches fire without external aid
[D]
indicated by 90% distillation temperature, i.e., when 90% of sample oil has distilled off
Answer: indicated by 90% distillation temperature, i.e., when 90% of sample oil has distilled off
47
Which is more viscous lub oil
[A]
SEA 30
[B]
SAE 4£
[C]
SAE 50
[D]
SAE 80
48
In loop scavenging, the top of the piston is
[A]
flat
[B]
contoured
[C]
slanted
[D]
depressed
49
In the crankcase method of scavenging, the air pressure is produced by
[A]
supercharger
[B]
centrifugal pump
[C]
natural aspirator
[D]
movement of engine piston
Answer: movement of engine piston
50
In a typical medium speed 4-stroke cycle diesel engine the inlet valve
[A]
opens at 20° before top dead center and closes at 35° after the bottom dead center
[B]
opens at top dead center and closes at bottom dead center
[C]
opens at 10° after top dead center and closes 20° before the bottom dead center
[D]
may open or close anywhere
Answer: opens at 20° before top dead center and closes at 35° after the bottom dead center
51
If the compression ratio of an engine working on Otto cycle is increased from 5 to 7, the %age increase in efficiency will be
[A]
2%
[B]
4%
[C]
8%
[D]
14%
52
An engine indicator is used to determine the following
[A]
speed
[B]
temperature
[C]
volume of cylinder
[D]
m.e.p. and I.H.P.
Answer: m.e.p. and I.H.P.
53
The accunmulation of carbon in a cylinder results in increase of
[A]
clearance volume
[B]
volumetric efficiency
[C]
ignition time
[D]
effective compression ratio
Answer: increasing the compression ratio
54
When crude oil is heated, then which of the following hydrocarbon is given off first.
[A]
kerosene
[B]
gasoline
[C]
paraffin
[D]
natural gas
55
The rating of a diesel engine, with increase in airintlet temperature, will
[A]
increase linearly
[B]
decrease linearly
[C]
increase parabolically
[D]
decrease parabolically
Answer: decrease linearly
56
Gaseous-fuel guarantees are based on
[A]
calorific value of oil
[B]
low heat value of oil
[C]
high heat value of oil
[D]
mean heat value of oil
Answer: low heat value of oil
57
Polymerisation is a chemical process in which molecules of a compound become
[A]
larger
[B]
slowed down
[C]
smaller
[D]
liquid
58
In diesel engine, the compression ratio in comparison to expansion ratio is
[A]
same
[B]
less
[C]
more
[D]
variable
59
Engine pistons 'are usually made of aluminium alloy because it
[A]
is lighter
[B]
wears less
[C]
absorbs shocks
[D]
is stronger
60
The size of inlet valve of.an engine in comparison to exhaust valve is
[A]
more
[B]
less
[C]
same
[D]
more/less depending on capacity of engine
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