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

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

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

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

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Internal Combustion Engines
Pick up the wrong statement about supercharging

Supercharging results in fuel economy
Supercharging at high altitudes is essential
There can be limited supercharging in petrol engines because of detonation
Supercharging reduces knocking in diesel engines

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

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

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