Internal Combustion Engines
The correct sequence of the decreasing order of brake thermal efficiency of the three given basic types of engines is

Two stroke S.I. engine, four stroke S.I. engine, four stroke C.I. engine
Four stroke C.I. engine, four stroke S.I. engine, two stroke S.I. engine
Four stroke C.I. engine, two stroke S.I. engine, four stroke S.I. engine
Four stroke S.I. engine, four stroke C.I. engine, two stroke S.I. engine

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Internal Combustion Engines
The expansion of fuel in a four stroke cycle diesel engine

Starts at 15° after top dead center and ends at 30° before bottom dead center
May start and end anywhere
Starts at 15° before top dead center and ends at 30° after top dead center
Starts at top dead center and ends at 30° after top dead center

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

A fine fuel spray mixed with air is ignited by the heat of compression which is at a high pressure
The fuel is first evaporated after passing through a carburettor and is mixed with air before ignition
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
All of these

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