Internal Combustion Engines
The reference fuels for knock rating of spark ignition engines would include

Normal heptane and iso-octane
Iso-octane and normal hexane
Iso-octane and alpha-methyl naphthalene
Normal octane and aniline

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Internal Combustion Engines
In a four stroke cycle diesel engine, the compression

Starts at 40° after bottom dead center and ends at 10° before top dead center
May start and end anywhere
Starts at top dead center and ends at 40° before bottom dead center
Starts at 40° before top dead center and ends at 40° after top dead center

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Internal Combustion Engines
The compensating jet in a carburettor supplies almost constant amount of petrol at all speeds because the

The flow from the main jet is diverted to the compensating jet with increase in speed
Flow is produced due to the static head in the float chamber
Jet area is automatically varied depending on the suction
The diameter of the jet is constant and the discharge coefficient is invariant

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