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

End of exhaust stroke
Beginning of exhaust stroke
End of suction stroke
Beginning of suction stroke

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Internal Combustion Engines
Detonation is harmful due to

High intensity of knock causes crankshaft vibration and the engine runs rough
Excessive turbulence which removes most of the insulating gas boundary layer from the cylinder walls
Increase in the rate of heat transfer, there is a reduction in the power output and efficiency of the engine
None of these

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Internal Combustion Engines
The purpose of testing an internal combustion engine is

All of these
To determine the information, which cannot be obtained by calculations
To conform the data used in design, the validity of which may be doubtful
To satisfy the customer regarding the performance of the engine

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