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Internal Combustion Engines

Internal Combustion Engines
The mechanical efficiency (ηm) of the engine is given by

ηm = B.P/I.P
ηm = I.P/B.P
None of these
ηm = (B.P × I.P)/100

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Internal Combustion Engines
If the speed of the engine is increased, the indicated power will

Decrease
None of these
Remain same
Increase

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Internal Combustion Engines
A supercharged engine as compared to an ordinary engine

Consumes less lubricating oil
Requires smaller foundation
All of these
Is lighter

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Internal Combustion Engines
The knocking in diesel engines may be prevented by

Increasing the inlet pressure of air
All of these
Reducing the delay period
Raising the compression ratio

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Internal Combustion Engines
The maximum temperature in the I.C. engine cylinder is of the order of

1500-2000°C
1000-1500°C
2000-2500°C
500-1000°C

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Internal Combustion Engines
The fuels in order of decreasing knock tendency for spark ignition engines are

Napthene, paraffin, aromatic
Napthene, aromatics, paraffin
Paraffin, napthene, aromatic
Paraffin, aromatic, napthene

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