Internal Combustion Engines
Pick up the wrong statement about supercharging

Supercharging reduces knocking in diesel engines
Supercharging results in fuel economy
There can be limited supercharging in petrol engines because of detonation
Supercharging at high altitudes is essential

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Internal Combustion Engines
Fuel consumption of diesel engines is not guaranteed at one quarter load because at such low loads

The engine is rarely operated
The friction is high
The friction is unpredictable
The small difference in cooling water temperature or in internal friction has a disproportionate effect

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Internal Combustion Engines
Which of the following statement is correct regarding petrol engines?

The fuel supplied to the engine cylinder is mixed with necessary amount of air and the mixture in ignited with the help of a spark plug
A fine fuel spray mixed with air is ignited by the heat of compression which is at a high pressure
All of these
The fuel is first evaporated after passing through a carburettor and is mixed with air before ignition

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Internal Combustion Engines
The exhaust valve in a four stroke cycle petrol engine

May open and close anywhere
Opens at 50° after bottom dead center and closes at 15° before top dead center
Opens at 50° before bottom dead center and closes at 15° after top dead center
Opens at bottom dead center and closes at top dead center

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