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Free download in PDF IC Engine Objective Type 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.
(21)
Most high speed compression engines operate on
[A]
Diesel cycle
[B]
Otto cycle
[C]
Dual combustion cycle
[D]
Special type of air cycle
Answer: Dual combustion cycle
(22)
Which of the following medium is compressed in a Diesel engine cylinder
[A]
air aione
[B]
air and fuel
[C]
air and lub oil
[D]
fuel alone
(23)
The air-fuel ratio of the petrol engine is controlled by
[A]
fuel pump
[B]
governor
[C]
injector
[D]
carburettor
(24)
Diesel fuel, compared to petrol is
[A]
less difficult to ignite
[B]
just about the same difficult to ignite
[C]
more difficult to ignite
[D]
highly ignitable
Answer: more difficult to ignite
(25)
In diesel engine the diesel fuel injected into cylinder would burn instantly at about compressed air temperature of
[A]
250°C
[B]
500°C
[C]
1000°C
[D]
150CPC
(26)
A 75 cc engine has following parameter as 75 cc
[A]
fuel tank capacity
[B]
lub oil capacity
[C]
swept volume
[D]
cylinder volume
(27)
A heat engine utilises the
[A]
calorific value of oil
[B]
low heat value of
[C]
high heat value of oil
[D]
mean heat value of oil
Answer: high heat value of oil
(28)
The term scavenging is generally associated with
[A]
2-stroke cycle engines
[B]
4-stroke cycle engines
[C]
diesel engines
[D]
high efficiency engines
Answer: high efficiency engines
(29)
The cam shaft of a four stroke I.C. engine running at 1500 rmp will run at
[A]
1500 rpm
[B]
750 rpm
[C]
3000 rpm
[D]
none of the above
(30)
Most high speed compression engines operate on
[A]
Otto cycle
[B]
Diesel cycle
[C]
Dual cycle
[D]
Carnot cycle
31
A diesel engine as compared to petrol engine (both running ar rated load) is
[A]
more efficient
[B]
less efficient
[C]
equally efficient
[D]
unperdictable
32
In a cycle, the spark lasts roughly for
[A]
1 sec
[B]
0.1 sec
[C]
0.01 sec
[D]
0.001 sec
33
Which of the following is false statement. Some of the methods used to reduce diesel smoke are as follows
[A]
using additives in the fuel
[B]
engine derating i.e. reducing the maxi-mum flow of fuel
[C]
increasing the compression ratio
[D]
adherence to proper fuel specification
Answer: increasing the compression ratio
34
Pick up the wrong statement about supercharging
[A]
supercharging reduces knocking in diesel engines
[B]
there can be limited supercharging in petrol engines because of detonation
[C]
supercharging at high altitudes is essential
[D]
supercharging results in fuel economy
Answer: supercharging results in fuel economy
35
The operation of forcing additional air under pressure in the engine cylinder is known as
[A]
scavenging
[B]
turbulence
[C]
supercharging
[D]
pre-ignition
36
The minimum cranking speed in case of petrol engine is about
[A]
half the operating speed
[B]
one-fourth of operating speed
[C]
250-300 rpm
[D]
60-80 rpm
37
The mean effective pressure obtained from engine indicator indicates the
[A]
maximum pressure developed
[B]
minimum pressure
[C]
instantaneous pressure at any instant
[D]
average pressure
38
Installation of supercharger on a four-cycle diesel engine can result in the following percentage increase in power
[A]
upto 25%
[B]
upto 35%
[C]
upto 50%
[D]
upto 100%
39
Which of the following is the lightest and most volatile liquid fuel
[A]
diesel
[B]
kerosene
[C]
fuel oil
[D]
gasoline
40
Air fuel ratio for idling speed of a petrol engine is approximately
[A]
1 : 1
[B]
5 : 1
[C]
10:1
[D]
15 : 1
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