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Internal Combustion Engines

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

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

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Internal Combustion Engines
A diesel engine is ___ as compared to petrol engine, both running at rated load.

Less efficient
None of the listed here
Equally efficient
More efficient

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Internal Combustion Engines
Air fuel ratio at which a petrol engine cannot work is

0.41736111111111
20 : 1 and less
0.62569444444444
0.33402777777778

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Internal Combustion Engines
The knocking tendency in spark ignition engines may be decreased by

Controlling the ignition timing
Reducing the compression ratio
Controlling the air-fuel mixture
Controlling the exhaust temperature

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Internal Combustion Engines
The ratio of indicated thermal efficiency to the corresponding air standard cycle efficiency is called

Efficiency ratio
Relative efficiency
Net efficiency
Overall efficiency

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Internal Combustion Engines
The normal heptane (C₇H₁₆) is given a rating of ________ octane number.

120
100
50
0

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