Internal Combustion Engines
The ratio of the brake power to the indicated power is called

Volumetric efficiency
Indicated thermal efficiency
Overall efficiency
Mechanical efficiency

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Internal Combustion Engines
Pour point of fuel oil is the

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

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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 at a high velocity to facilitate atomization
All of these
Inject fuel in a chamber of high pressure at the end of compression stroke

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