Internal Combustion Engines
As compared to air standard cycle, in actual working, the effect of variation in specific heats is to

Increase maximum pressure and decrease maximum temperature
Increase maximum pressure and maximum temperature
Decrease maximum pressure and increase maximum temperature
Reduce maximum pressure and maximum temperature

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Internal Combustion Engines
The exhaust valve in a four stroke cycle petrol engine

Opens at bottom dead center and closes at top dead center
May open and close anywhere
Opens at 50° after bottom dead center and closes at 15° before top dead center
Opens at 50° before bottom dead center and closes at 15° after top dead center

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