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Internal Combustion Engines

Internal Combustion Engines
The working pressure and temperature inside the cylinder of an internal combustion engine is _________ as compared to a steam engine.

Very high
High
Very low
Low

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Internal Combustion Engines
In a cycle, the spark lasts roughly for

1 sec
0.001 sec
0.1 sec
0.01 sec

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Internal Combustion Engines
The size of inlet valve of an engine in comparison to exhaust valve is

More
More/less depending on capacity of engine
Less
Same

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Internal Combustion Engines
The thermal efficiency of a standard Otto cycle for a compression ratio of 5.5 will be

1
0.7
0.25
0.5

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Internal Combustion Engines
Most high speed compression engines operate on

Otto cycle
Special type of air cycle
Dual combustion cycle
Diesel cycle

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

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

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