Internal Combustion Engines
Pour point of fuel oil is the

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
Indicated by 90% distillation temperature i.e., when 90% of sample oil has distilled off
It catches fire without external aid

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Internal Combustion Engines
Scavenging air in diesel engine means

Air used for forcing burnt gases out of engine's cylinder during the exhaust period
Air used for combustion sent under pressure
Burnt air containing products of combustion
Forced air for cooling cylinder

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MORE MCQ ON Internal Combustion Engines