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

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Internal Combustion Engines
The ratio of the work obtained at the crankshaft in a given time to the energy supplied during the same time is called

Indicated thermal efficiency
Volumetric efficiency
Overall efficiency
Mechanical efficiency

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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
Raising the compression ratio
Reducing the delay period

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Internal Combustion Engines
The two reference fuels used for cetane rating are

Cetane and tetra ethyl lead
Cetane and alpha-methyl naphthalene
Cetane and normal heptane
Cetane and iso-octane

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Internal Combustion Engines
The thermal efficiency of diesel engines is about

0.7
0.5
0.15
0.3

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Internal Combustion Engines
Scavenging is usually done to increase

Thermal efficiency
Fuel consumption
Speed
Power output

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MORE MCQ ON Internal Combustion Engines

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