Q. In order to prevent knocking in spark ignition engines, the charge away from the spark plug should have

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Q. The size of a reactor at which the chain reaction can be initiated (i.e. when system becomes critical) with just enough fissionable material (called critical mass of fuel) is known as critical size of reactor.

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Q. The mechanical efficiency (ηm) of the engine is given by

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

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Q. The engines in which the combustion of fuel takes place inside the engine cylinder are called internal combustion engines.

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Q. A fuel will detonate less if it has higher self ignition temperature.

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Q. The combustion in compression ignition engines is

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Q. Which of the following fuel detonates readily ?

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

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Q. The petrol engines are also known as __________ engines.

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Q. The specific fuel consumption per B.P. hour for a petrol engine is about

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Q. The material most commonly used for sheilding is

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

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Q. The air standard efficiency of an I.C. engine depends on

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Q. The mean effective pressure of a diesel engine having fixed compression ratio will __________ if cut off ratio decreases.

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Q. The knocking tendency in spark ignition engines may be decreased by

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Q. In a two stroke engine, the working cycle is completed in two revolutions of the crankshaft.

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Q. A reactor capable of converting a fertile material into fissile isotopes is called regenerative reactor.

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Q. Alpha-methyl-naphthalene (C₁₁ H₁₀) has a cetane number of

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