Internal Combustion Engines
The basic requirement of a good combustion chamber is

High thermal efficiency and power output
Low volumetric efficiency
Low compression ratio
Minimum turbulence

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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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Internal Combustion Engines
The tangential velocity of the water element having a free vortex is

Inversely proportional to its distance from the centre
Directly proportional to its (distance)2 from the centre
Directly proportional to its distance from the centre
Inversely proportional to its (distance)2 from the centre

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