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Rapid explosion of air-fuel mixture within the cylinder, when ignited by a spark is known as _______

a) constant heat combustion
b) constant pressure combustion
c) constant volume combustion
d) cut off ratio

Answer: c
Explanation: There are two ways in which combustion takes place in the cylinder. When there is a rapid explosion of air- fuel mixture within the cylinder when it is ignited by spark, is called constant volume combustion and when there is a slow burning when the fuel is injected into highly compressed heated air, then it is known as constant pressure combustion.

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