Internal Combustion Engines
The fuels in order of decreasing knock tendency for spark ignition engines are

Napthene, paraffin, aromatic
Napthene, aromatics, paraffin
Paraffin, napthene, aromatic
Paraffin, aromatic, napthene

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Internal Combustion Engines
The injector nozzle of a compression ignition engine is required to inject fuel at a sufficiently high pressure in order to

Ensure that penetration is not high
Inject fuel in a chamber of high pressure at the end of compression stroke
All of these
Inject fuel at a high velocity to facilitate atomization

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

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Internal Combustion Engines
Flash point of fuel oil is

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
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

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