IC Engine MCQ Questions

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.

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Practice Test 1

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IC Engine Practice Set 1

IC Engine Practice Set 1

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 In a four stroke cycle diesel engine, the compression

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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.

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Iso-octane (C₈H₁₈) has octane number of

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

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

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The accumulation of carbon in a cylinder results in increase of

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

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

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

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 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

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A supercharged engine as compared to an ordinary engine

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

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

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

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

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

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

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

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A stoichiometric air-fuel ratio is

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 A petrol engine, during suction stroke draws

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Practice Test 2

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IC Engine Practice Set 2

IC Engine Practice Set 2

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A heat engine utilizes the

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

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

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 Flash point of fuel oil is

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

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 The combustion in compression ignition engines is

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The colour of exhaust from diesel engine is generally

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Detonation is harmful due to

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

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

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 The fuel in diesel engine is normally injected at pressure of

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

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

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

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

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

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Crankcase explosion in I.C. engines usually occurs as

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The calorific value of gaseous fuels is expressed in terms of

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

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

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Practice Test 3

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IC Engine Practice Set 3

IC Engine Practice Set 3

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

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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

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

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 In a four stroke cycle petrol engine, the inlet valve

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

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

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

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

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 For the same compression ratio

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

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

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 In a four stroke cycle diesel engine, the inlet valve

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Engine pistons are usually made of aluminium alloy because it

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

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Scavenging is usually done to increase

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

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

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

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

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Most high speed compression engines operate on

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Practice test 4

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IC Engine Practice Set 4

IC Engine Practice Set 4

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 The cetane number of diesel oil, generally available, is

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

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 The ignition quality of diesel oil is expressed by

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

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

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In loop scavenging, the top of the piston is

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A diesel engine has compression ratio from

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

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

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The knock in diesel engine occurs due to

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

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 The brake power is the power available

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The reason for supercharging in any engine is to

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

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

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The scavenging efficiency of a four stroke cycle diesel engine is

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

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

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

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

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Practice Test 5

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IC Engine Practice Set 5

IC Engine Practice Set 5

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 If petrol is used in a diesel engine, then

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

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 In a four stroke cycle petrol engine, the expansion

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The expansion of fuel in a four stroke cycle diesel engine

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 Compression loss in I.C engines occurs due to

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 The volumetric efficiency of a well designed engine may be

 

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The effective inhibitor of pre-ignition is

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

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 The brake power is the power available

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Antiknock for compression ignition engines is

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

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

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Which of the following statement is wrong?

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In a typical medium speed 4-stroke cycle diesel engines

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

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The thermal efficiency of diesel engines is about

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In a typical medium speed 4-stroke cycle diesel engine

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In a diesel engine, the fuel is ignited by

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

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

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