Internal Combustion Engines
The knocking in diesel engines may be prevented by

Increasing the inlet pressure of air
All of these
Reducing the delay period
Raising the compression ratio

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

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