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Internal Combustion Engines

Internal Combustion Engines
The thermal efficiency of a petrol engine is _________ as compared to diesel engine.

More
Same
Less
None of these

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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
It is properly designed
Cannot work as it is impossible
Flywheel size is proper

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Internal Combustion Engines
The following volume of air is required for consuming 1 liter of fuel by a four stroke engine

5 m3
56 m3
1 m3
910 m3

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Internal Combustion Engines
The brake power of a diesel engine, keeping other parameters constant, can be increased by

Increasing the pressure of intake air
Decreasing the density of intake air
Decreasing the pressure of intake air
Increasing the temperature of intake air

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Internal Combustion Engines
When a body, floating in a liquid, is given a small angular displacement, it starts oscillating about a point known as

Centre of pressure
Centre of buoyancy
Centre of gravity
Metacentre

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Internal Combustion Engines
Air fuel ratio for idling speed of a petrol engine is approximately

0.042361111111111
0.20902777777778
0.41736111111111
0.62569444444444

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