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Internal Combustion Engines

Internal Combustion Engines
In petrol engine, using a fixed octane rating fuel and fixed compression ratio, supercharging will _________ the knocking tendency.

None of these
Decrease
Increase
Not effected

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Internal Combustion Engines
A diesel engine has

3 valves
2 valves
1 valve
4 valves

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Internal Combustion Engines
A stoichiometric air-fuel ratio is

Lean mixture
Chemically correct mixture
Rich mixture for idling
Rich mixture for over loads

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

Equally efficient
More efficient
Less efficient
None of the listed here

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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
Scavenging is usually done to increase

Fuel consumption
Power output
Speed
Thermal efficiency

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