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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
ηm = (B.P × I.P)/100
None of these

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Internal Combustion Engines
The thermal efficiency of diesel engines is about

0.5
0.3
0.15
0.7

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Internal Combustion Engines
The effective inhibitor of pre-ignition is

Lead
None of these
Water
Alcohol

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Internal Combustion Engines
In compression ignition engines, swirl denotes a

Haphazard motion of the gases in the chamber
Radial motion of the gases in the chamber
Rotary motion of the gases in the chamber
None of the listed here

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Internal Combustion Engines
The maximum propulsive efficiency of a turbojet engine is at a speed of

2000 km/h
2400 km/h
3000 km/h
1000 km/h

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Internal Combustion Engines
Supercharging is essential in

Petrol engines
Gas turbines
Aircraft engines
Diesel engines

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