Internal Combustion Engines
Which of the following is false statement?

Piston ring and cylinder wear
Formation of hard coating on piston skirts
Detonation
Oil sludge in the engine crank case

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Internal Combustion Engines
Compression ratio of I.C. Engines is

Swept volume/cylinder volume
The ratio of volumes of air in cylinder before compression stroke and after compression stroke
Ratio of pressure after compression and before compression
Volume displaced by piston per stroke and clearance volume in cylinder

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Internal Combustion Engines
Volatility of diesel fuel oil is

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

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Internal Combustion Engines
Pour point of fuel oil is the

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
Temperature at which it solidifies or congeals

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