Internal Combustion Engines
A gas engine has a swept volume of 300 cm3 and clearance volume of 25 cm3. Its volumetric efficiency is 0.88 and mechanical efficiency is 0.90. The volume of the mixture taken in per stroke is

252 cm3
286 cm3
264 cm3
248 cm3

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Internal Combustion Engines
The compensating jet in a carburettor supplies almost constant amount of petrol at all speeds because the

Jet area is automatically varied depending on the suction
The flow from the main jet is diverted to the compensating jet with increase in speed
Flow is produced due to the static head in the float chamber
The diameter of the jet is constant and the discharge coefficient is invariant

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

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Internal Combustion Engines
Volatility of diesel fuel oil is

It catches fire without external aid
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
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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