Automobile Engineering in ME
The condition that causes vapour locking in a brake system is

Keeping the vehicle without use for an extended period
Overheating of the fluid due to frequent brake application
Overcooling of the brakes during high speed driving
An excessively high engine speed on a downhill road

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Automobile Engineering in ME
A basic difference between the spark ignition engine and the Diesel engine is that the

Air temperature ignites the fuel in the Diesel engine
All of these
Diesel engine compresses air alone instead of an air-fuel mixture
Fuel is sprayed into the combustion chamber in the Diesel engine as the piston nears T.D.C. on the compression stroke

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