Internal Combustion Engines
In a four stroke cycle petrol engine, the inlet valve

May open or close anywhere
Opens at 20° after top dead center and closes at 20° before bottom dead center
Opens at top dead center and closes at bottom dead center
Opens at 20° before top dead center and closes at 40° after bottom dead center

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Internal Combustion Engines
Fuel consumption of diesel engines is not guaranteed at one quarter load because at such low loads

The engine is rarely operated
The friction is unpredictable
The friction is high
The small difference in cooling water temperature or in internal friction has a disproportionate effect

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Internal Combustion Engines
Which one of the following event would reduce volumetric efficiency of a vertical compression ignition engine?

Inlet valve closing after bottom dead center
Inlet valve closing before bottom dead center
Exhaust valve closing after top dead center
Inlet valve opening before top dead center

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