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

Opens at bottom dead center and closes at top dead center
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
May open and close anywhere

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Internal Combustion Engines
Flash point of fuel oil is

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
Indicated by 90% distillation temperature, i.e. when 90% of sample oil has distilled off
Temperature at which it solidifies or congeals

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Internal Combustion Engines
A hydraulic ram is a device used to

Store the energy of water
Increase the pressure of water
To lift water from deep wells
To lift small quantity of water to a greater height when a large quantity of water is available at a smaller height

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Internal Combustion Engines
Pick up the wrong statement about supercharging

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

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