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

411

IC Engine Practice Set 1

IC Engine Practice Set 1

1 / 20

 A petrol engine, during suction stroke draws

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

3 / 20

The accumulation of carbon in a cylinder results in increase of

4 / 20

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

5 / 20

 In a four stroke cycle diesel engine, the compression

6 / 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

7 / 20

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

8 / 20

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

9 / 20

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

10 / 20

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

11 / 20

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

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A supercharged engine as compared to an ordinary engine

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

14 / 20

Iso-octane (C₈H₁₈) has octane number of

15 / 20

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

16 / 20

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

17 / 20

A stoichiometric air-fuel ratio is

18 / 20

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

19 / 20

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

20 / 20

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

Your score is

The average score is 54%

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Practice Test 2

230

IC Engine Practice Set 2

IC Engine Practice Set 2

1 / 20

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

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 The fuel in diesel engine is normally injected at pressure of

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Crankcase explosion in I.C. engines usually occurs as

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

5 / 20

A heat engine utilizes the

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

7 / 20

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

8 / 20

Detonation is harmful due to

9 / 20

The calorific value of gaseous fuels is expressed in terms of

10 / 20

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

11 / 20

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

12 / 20

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

13 / 20

 The combustion in compression ignition engines is

14 / 20

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

15 / 20

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

16 / 20

 Flash point of fuel oil is

17 / 20

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

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

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

Your score is

The average score is 53%

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Practice Test 3

159

IC Engine Practice Set 3

IC Engine Practice Set 3

1 / 20

Most high speed compression engines operate on

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

3 / 20

 In a four stroke cycle diesel engine, the inlet valve

4 / 20

 For the same compression ratio

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

6 / 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

7 / 20

 In a four stroke cycle petrol engine, the inlet valve

8 / 20

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

9 / 20

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

10 / 20

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

11 / 20

Engine pistons are usually made of aluminium alloy because it

12 / 20

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

13 / 20

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

14 / 20

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

15 / 20

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

16 / 20

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

17 / 20

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

18 / 20

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

19 / 20

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

20 / 20

Scavenging is usually done to increase

Your score is

The average score is 56%

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Practice test 4

120

IC Engine Practice Set 4

IC Engine Practice Set 4

1 / 20

In loop scavenging, the top of the piston is

2 / 20

 The cetane number of diesel oil, generally available, is

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

4 / 20

A diesel engine has compression ratio from

5 / 20

The knock in diesel engine occurs due to

6 / 20

 The ignition quality of diesel oil is expressed by

7 / 20

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

8 / 20

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

9 / 20

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

10 / 20

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

11 / 20

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

12 / 20

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

13 / 20

The reason for supercharging in any engine is to

14 / 20

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

15 / 20

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

16 / 20

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

17 / 20

The scavenging efficiency of a four stroke cycle diesel engine is

18 / 20

 The brake power is the power available

19 / 20

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

20 / 20

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

Your score is

The average score is 58%

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Practice Test 5

117

IC Engine Practice Set 5

IC Engine Practice Set 5

1 / 20

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

2 / 20

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

3 / 20

 The brake power is the power available

4 / 20

The thermal efficiency of diesel engines is about

5 / 20

The expansion of fuel in a four stroke cycle diesel engine

6 / 20

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

7 / 20

In a typical medium speed 4-stroke cycle diesel engines

8 / 20

In a diesel engine, the fuel is ignited by

9 / 20

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

10 / 20

 In a four stroke cycle petrol engine, the expansion

11 / 20

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

12 / 20

 If petrol is used in a diesel engine, then

13 / 20

 Compression loss in I.C engines occurs due to

14 / 20

Antiknock for compression ignition engines is

15 / 20

 The volumetric efficiency of a well designed engine may be

 

16 / 20

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

17 / 20

Which of the following statement is wrong?

18 / 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.

19 / 20

In a typical medium speed 4-stroke cycle diesel engine

20 / 20

The effective inhibitor of pre-ignition is

Your score is

The average score is 61%

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