IC Engine Quiz | IC Engine Objective Type Questions and Answers

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Questions
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

Answer: air aione
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23 The air-fuel ratio of the petrol engine is controlled by
A fuel pump
B governor
C injector
D carburettor

Answer: 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

Answer: 1000°C
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

Answer: swept 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

Answer: 750 rpm
30 Most high speed compression engines operate on
A Otto cycle
B Diesel cycle
C Dual cycle
D Carnot cycle

Answer: Dual 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

Answer: more efficient
32 In a cycle, the spark lasts roughly for
A 1 sec
B 0.1 sec
C 0.01 sec
D 0.001 sec

Answer: 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

Answer: supercharging
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

Answer: 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

Answer: 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%

Answer: upto 100%
39 Which of the following is the lightest and most volatile liquid fuel
A diesel
B kerosene
C fuel oil
D gasoline

Answer: 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

Answer: 10:1

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