Mechanical Engineering · all questions

Internal Combustion Engines (I.C. Engines)
practice.

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Q101

The air requirement of a petrol engine during starting compared to theoretical air required for complete combustion is

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Q102

Which of the following fuel detonates readily?

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Q103

Pour point of fuel oil is the

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Q104

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

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Q105

Compression ratio of I.C. Engines is

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Q106

The effective inhibitor of pre-ignition is

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Q107

The brake power (B.P.) of the engine is given by (where W = Brake load or dead load in newtons,

l

= Length of arm in meters, N = Speed of engine in r.p.m., S = Spring balance reading in newtons, D = Diameter of brake drum in meters and d = Diameter of rope in meters)

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Q108

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

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Q109

The air standard efficiency of an I.C. engine is given by (where r = Compression ratio and

γ

= Ratio of specific heats)

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Q110

The frictional power (F.P.) is given by

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Q111

If the compression ratio of an engine working on Otto cycle is increased from 5 to 7, the percentage increase in efficiency will be

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Q112

Supercharging is essential in

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Q113

Which of the following statement is correct regarding petrol engines?

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Q114

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

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Q115

The colour of exhaust from diesel engine is generally

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Q116

A heat engine utilizes the

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Q117

In the opposed piston diesel engine, the combustion chamber is located

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Q118

A mixture containing 65% of iso-octane and 35% of normal heptane will have

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Q119

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

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Q120

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

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