Here you will find IC Engine MCQ Questions which are asked in interviews as well as in Competitive Examinations. Please through these practice test and test your preparation.

Practice Test 1

217

IC Engine Practice Set 1

IC Engine Practice Set 1

1 / 20

Which one of the following engines will have heavier flywheel than the remaining ones?

2 / 20

By higher octane number of spark ignition fuel, it is meant that the fuel has

3 / 20

The loud pulsating noise heard within the cylinder of an internal combustion engine is known as

4 / 20

 A gas engine has a swept volume of 300 cm3 and clearance volume of 25 cm3. Its volumetric efficiency is 0.88 and mechanical efficiency is 0.90. The volume of the mixture taken in per stroke is

5 / 20

The ignition of the charge by some hot surface within the engine before the passage of spark is called

6 / 20

A stoichiometric air-fuel ratio is

7 / 20

The function of a distributor in a coil ignition system of I.C. engines is

8 / 20

Which of the following does not relate to a spark ignition engine?

9 / 20

 A petrol engine, during suction stroke draws

10 / 20

The rating of a diesel engine, with increase in air inlet temperature, will

11 / 20

Number of working strokes per min. for a two stroke cycle engine is _________ the speed of the engine in r.p.m.

12 / 20

Iso-octane (C₈H₁₈) has octane number of

13 / 20

In petrol engines, advancing of the spark timing will _________ the knocking tendency.

14 / 20

A supercharged engine as compared to an ordinary engine

15 / 20

 Does the supply of scavenging air at a density greater than that of atmosphere mean engine is supercharged?

16 / 20

The specific fuel consumption per BHP hour for diesel engine is approximately

17 / 20

 In a four stroke cycle diesel engine, the compression

18 / 20

The ratio of indicated thermal efficiency to the corresponding air standard cycle efficiency is called

19 / 20

The size of inlet valve of an engine in comparison to exhaust valve is

20 / 20

The accumulation of carbon in a cylinder results in increase of

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The average score is 54%

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Practice Test 2

116

IC Engine Practice Set 2

IC Engine Practice Set 2

1 / 20

Which of the following is not an intern’s combustion engine?

2 / 20

 Flash point of fuel oil is

3 / 20

 In a typical medium speed, 4-stroke cycle diesel engine

4 / 20

The firing order in an I.C. engine depends upon

5 / 20

 It the temperature of intake air in IC engines is lowered, then its efficiency will

6 / 20

 Which of the following is false statement? Some of the methods used to reduce diesel smoke are as follows

7 / 20

 In diesel engine, the compression ratio in comparison to expansion ratio is

8 / 20

Crankcase explosion in I.C. engines usually occurs as

9 / 20

 The fuel in diesel engine is normally injected at pressure of

10 / 20

The calorific value of gaseous fuels is expressed in terms of

11 / 20

The inlet valve of a four stroke cycle internal combustion engine remains open for

12 / 20

 The combustion in compression ignition engines is

13 / 20

 For the same power developed in I.C. engines, the cheaper system is

14 / 20

A heat engine utilizes the

15 / 20

In a naturally aspirated diesel engine, the air is supplied by

16 / 20

The higher combustion chamber wall temperature in compression ignition engines will _________ knocking tendency.

17 / 20

 The working pressure and temperature inside the cylinder of an internal combustion engine is _________ as compared to a steam engine.

18 / 20

The colour of exhaust from diesel engine is generally

19 / 20

The cam shaft of a four stroke I.C. engine running at 1500 rpm will run at

20 / 20

Detonation is harmful due to

Your score is

The average score is 52%

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Practice Test 3

78

IC Engine Practice Set 3

IC Engine Practice Set 3

1 / 20

The ratio of the volume of charge admitted at N.T.P. to the swept volume of the piston is called

2 / 20

Scavenging is usually done to increase

3 / 20

 In a four stroke cycle petrol engine, the inlet valve

4 / 20

 In a four stroke cycle diesel engine, the inlet valve

5 / 20

 For the same compression ratio

6 / 20

 In a four stroke cycle petrol engine, the pressure inside the engine cylinder during the suction stroke is __________ the atmospheric pressure.

7 / 20

 In the crankcase method of scavenging, the air pressure is produced by

8 / 20

If one cylinder of a diesel engine receives more fuel than the others, then for that cylinder the

9 / 20

 For maximum power generation, the air fuel ratio for a petrol engine for vehicles, is of the order of

10 / 20

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

11 / 20

 The pressure at the end of compression, in diesel engines, is approximately

12 / 20

 In order to eliminate knocking in compression ignition engines, there should be

13 / 20

 Thermal efficiency of a two stroke cycle engine is _________ a four stroke cycle engine.

14 / 20

The correct sequence of the decreasing order of brake thermal efficiency of the three given basic types of engines is

15 / 20

 If the intake air temperature of I.C. engine increases, its efficiency will

16 / 20

Engine pistons are usually made of aluminium alloy because it

17 / 20

Most high speed compression engines operate on

18 / 20

Theoretically, a four stroke cycle engine should develop _________ power as that of a two stroke cycle engine.

19 / 20

The output of a diesel engine can be increased without increasing the engine revolution or size in following way

20 / 20

 When crude oil is heated, then which of the following hydrocarbon is given off first?

Your score is

The average score is 57%

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Practice test 4

59

IC Engine Practice Set 4

IC Engine Practice Set 4

1 / 20

The reason for supercharging in any engine is to

2 / 20

 In a diesel engine, the duration between the time of injection and ignition, is known as

3 / 20

 If the compression ratio in I.C. engine increases, then its thermal efficiency will

4 / 20

In a four stroke cycle, the minimum temperature inside the engine cylinder occurs at the

5 / 20

The knock in diesel engine occurs due to

6 / 20

In loop scavenging, the top of the piston is

7 / 20

The _________ engines can work on very lean mixture of fuel.

8 / 20

 Pre-ignition is caused by the spontaneous combustion of the mixture before the end of the compression stroke, and is due to

9 / 20

 The ignition quality of diesel oil is expressed by

10 / 20

A diesel engine has compression ratio from

11 / 20

The temperature of interior surface of cylinder wall in normal operation is not allowed to exceed

12 / 20

The working cycle in case of four stroke engine is completed in following number of revolutions of crankshaft

13 / 20

The increase in intake temperature of internal combustion engines will _________ efficiency.

14 / 20

 The cetane number of diesel oil, generally available, is

15 / 20

The scavenging efficiency of a four stroke cycle diesel engine is

16 / 20

The process of breaking up or a liquid into fine droplets by spraying is called

17 / 20

The object of providing masked inlet valve in the air passage of compression ignition engines is to

18 / 20

 The brake power is the power available

19 / 20

The power actually developed by the engine cylinder of an I.C. engine is known as

20 / 20

 Supercharging is the process of supplying the intake air to the engine cylinder at a density _________ the density of the surrounding atmosphere.

Your score is

The average score is 59%

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Practice Test 5

48

IC Engine Practice Set 5

IC Engine Practice Set 5

1 / 20

Antiknock for compression ignition engines is

2 / 20

Which of the following statement is wrong?

3 / 20

 Compression loss in I.C engines occurs due to

4 / 20

In a typical medium speed 4-stroke cycle diesel engines

5 / 20

A two stroke cycle engine gives ________ the number of power strokes as compared to the four stroke cycle engine, at the same engine speed.

6 / 20

The ratio of the brake power to the indicated power is called

7 / 20

In a diesel engine, the fuel is ignited by

8 / 20

 If petrol is used in a diesel engine, then

9 / 20

If the speed of the engine is increased, the indicated power will

10 / 20

In a typical medium speed 4-stroke cycle diesel engine

11 / 20

 In a four stroke cycle engine, the sequence of operations is

12 / 20

 The volumetric efficiency of a well designed engine may be

 

13 / 20

The thermal efficiency of diesel engines is about

14 / 20

 In a four stroke cycle petrol engine, the expansion

15 / 20

The expansion of fuel in a four stroke cycle diesel engine

16 / 20

In diesel engine the diesel fuel injected into cylinder would burn instantly at about compressed air temperature of

17 / 20

 For the same power developed in I.C. engines, the cheaper system is

18 / 20

 The brake power is the power available

19 / 20

The cam shaft of a four stroke I.C. engine running at 1500 rpm will run at

20 / 20

The effective inhibitor of pre-ignition is

Your score is

The average score is 62%

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