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

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

2 / 20

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

3 / 20

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

4 / 20

A stoichiometric air-fuel ratio is

5 / 20

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

6 / 20

A supercharged engine as compared to an ordinary engine

7 / 20

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

8 / 20

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

9 / 20

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

10 / 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

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

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

13 / 20

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

14 / 20

The accumulation of carbon in a cylinder results in increase of

15 / 20

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

16 / 20

 In a four stroke cycle diesel engine, the compression

17 / 20

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

18 / 20

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

19 / 20

Iso-octane (C₈H₁₈) has octane number of

20 / 20

 A petrol engine, during suction stroke draws

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

2 / 20

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

3 / 20

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

4 / 20

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

5 / 20

 Flash point of fuel oil is

6 / 20

Detonation is harmful due to

7 / 20

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

8 / 20

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

9 / 20

Crankcase explosion in I.C. engines usually occurs as

10 / 20

A heat engine utilizes the

11 / 20

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

12 / 20

The colour of exhaust from diesel engine is generally

13 / 20

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

14 / 20

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

15 / 20

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

16 / 20

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

17 / 20

 The fuel in diesel engine is normally injected at pressure of

18 / 20

 The combustion in compression ignition engines is

19 / 20

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

20 / 20

The calorific value of gaseous fuels is expressed in terms of

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

2 / 20

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

3 / 20

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

4 / 20

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

5 / 20

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

6 / 20

Scavenging is usually done to increase

7 / 20

 In a four stroke cycle diesel engine, the inlet valve

8 / 20

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

9 / 20

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

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

12 / 20

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

13 / 20

Engine pistons are usually made of aluminium alloy because it

14 / 20

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

15 / 20

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

16 / 20

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

17 / 20

 For the same compression ratio

18 / 20

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

19 / 20

 In a four stroke cycle petrol engine, the inlet valve

20 / 20

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

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

The scavenging efficiency of a four stroke cycle diesel engine is

2 / 20

The knock in diesel engine occurs due to

3 / 20

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

4 / 20

A diesel engine has compression ratio from

5 / 20

 The brake power is the power available

6 / 20

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

7 / 20

 The ignition quality of diesel oil is expressed by

8 / 20

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

9 / 20

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

10 / 20

The reason for supercharging in any engine is to

11 / 20

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

12 / 20

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

13 / 20

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

14 / 20

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

15 / 20

In loop scavenging, the top of the piston is

16 / 20

 The cetane number of diesel oil, generally available, is

17 / 20

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

18 / 20

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

19 / 20

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

20 / 20

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

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 diesel engine, the fuel is ignited by

2 / 20

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

3 / 20

 If petrol is used in a diesel engine, then

4 / 20

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

5 / 20

The effective inhibitor of pre-ignition is

6 / 20

The expansion of fuel in a four stroke cycle diesel engine

7 / 20

Which of the following statement is wrong?

8 / 20

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

9 / 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.

10 / 20

 Compression loss in I.C engines occurs due to

11 / 20

 The volumetric efficiency of a well designed engine may be

 

12 / 20

 In a four stroke cycle petrol engine, the expansion

13 / 20

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

14 / 20

The thermal efficiency of diesel engines is about

15 / 20

 The brake power is the power available

16 / 20

Antiknock for compression ignition engines is

17 / 20

In a typical medium speed 4-stroke cycle diesel engine

18 / 20

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

19 / 20

In a typical medium speed 4-stroke cycle diesel engines

20 / 20

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

Your score is

The average score is 61%

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