Internal Combustion Engines
The pressure and temperature at the end of compression stroke in a petrol engine are of the order of

20-30 kg/cm² and 450-500°C
4-6 kg/cm² and 200-250°C
6-12 kg/cm² and 250-350°C
12-20 kg/cm² and 350-450°C

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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

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
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

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