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Internal Combustion Engines

Internal Combustion Engines
The colour of exhaust from diesel engine is generally

Bluish
Black
Violet
White

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

ηm = I.P/B.P
ηm = B.P/I.P
ηm = (B.P × I.P)/100
None of the listed here

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Internal Combustion Engines
If the compression ratio of an engine working on Otto cycle is increased from 5 to 7, the percentage increase in efficiency will be

0.14
0.08
0.02
0.04

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Internal Combustion Engines
In a petrol engine, the mixture has the lowest pressure at the

End of suction stroke
End of compression stroke
None of these
Beginning of suction stroke

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Internal Combustion Engines
The term scavenging is generally associated with

High efficiency engines
Aeroplane engines
4-stroke cycle engines
2-stroke cycle engines

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Internal Combustion Engines
In case of gas turbines, the gaseous fuel consumption guarantees are based on

Low heat value
Net calorific value
High heat value
Calorific value

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