Internal Combustion Engines
Which of the following is false statement?

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

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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
It catches fire without external aid
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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Internal Combustion Engines
For the same compression ratio

Diesel cycle is more efficient than Otto
Both Otto and Diesel cycles are, equally efficient
Compression ratio has nothing to do with efficiency
Otto cycle is more efficient than the Diesel

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Internal Combustion Engines
Pick up the wrong statement about supercharging

Supercharging results in fuel economy
Supercharging at high altitudes is essential
There can be limited supercharging in petrol engines because of detonation
Supercharging reduces knocking in diesel engines

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