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Internal Combustion Engines

Internal Combustion Engines
In diesel engine the diesel fuel injected into cylinder would burn instantly at about compressed air temperature of

1000°C
250°C
500°C
2000°C

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

More/less depending on capacity of engine
More
Less
Same

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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

Volumetric efficiency
Mechanical efficiency
Overall efficiency
Indicated thermal efficiency

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Internal Combustion Engines
The object of supercharging the engine is

To reduce space occupied by the engine
All of these
To reduce mass of the engine per brake power
To increase the power output of an engine when greater power is required

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Internal Combustion Engines
Diesel engine can work on very lean air fuel ratio of the order of 30: 1. A petrol engine can also work on such a lean ratio provided

Best quality fuel is used
Cannot work as it is impossible
Flywheel size is proper
It is properly designed

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Internal Combustion Engines
The minimum cranking speed in case of petrol engine is about

250 - 300 rpm
Half the operating speed
60 - 80 rpm
One fourth of operating speed

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MORE MCQ ON Internal Combustion Engines

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