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

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

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Internal Combustion Engines
Which one of the following event would reduce volumetric efficiency of a vertical compression ignition engine?

Exhaust valve closing after top dead center
Inlet valve closing after bottom dead center
Inlet valve closing before bottom dead center
Inlet valve opening before top dead center

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Internal Combustion Engines
For the same compression ratio

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

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Internal Combustion Engines
Which one of the following engines will have heavier flywheel than the remaining ones?

30 kW two-stroke diesel engine running at 750 r.p.m.
30 kW two-stroke petrol engine running at 1500 r.p.m.
30 kW four-stroke diesel engine running at 750 r.p.m.
30 kW four-stroke petrol engine running at 1500 r.p.m.

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