Internal Combustion Engines
In a four stroke cycle diesel engine, the exhaust valve

Opens at 30° before bottom dead centre and closes at 10° after top dead centre
Opens at 30° after bottom dead centre and closes at 10° before top dead centre
Opens at bottom dead centre and closes at top dead centre
May open and close anywhere

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Internal Combustion Engines
Flash point of fuel oil is

Temperature at which it solidifies or congeals
Indicated by 90% distillation temperature, i.e. when 90% of sample oil has distilled off
Minimum temperature to which oil is heated in order to give off inflammable vapours in sufficient quantity to ignite momentarily when brought in contact with a flame
Temperature at which it catches fire without external aid

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Internal Combustion Engines
Pick up the wrong statement about supercharging

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

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