Internal Combustion Engines
Fuel consumption of diesel engines is not guaranteed at one quarter load because at such low loads

The engine is rarely operated
The friction is unpredictable
The small difference in cooling water temperature or in internal friction has a disproportionate effect
The friction is high

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

Jet area is automatically varied depending on the suction
The diameter of the jet is constant and the discharge coefficient is invariant
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

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

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

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