21) Ratio of indicated H.P. and brake H.P. is known as

mechanical efficiency

volumetric efficiency

isothermal efficiency

adiabatic efficiency

Answer is:

mechanical efficiency

compression index

compression ratio

compressor efficiency

mean effective pressure

Answer is:

as large as possible

as small as possible

about 50% of swept volume

about 100% of swept volume

Answer is:

gauge discharge pressure to the gauge intake pressure

absolute discharge pressure to the ab-solute intake pressure

pressures at discharge and suction cor-responding to same temperature

stroke volume and clearance volume

Answer is:

to accommodate Valves in the cylinder head

to provide cushioning effect

to attain high volumetric efficiency

to provide cushioning effect and also to avoid mechanical bang of piston with cylinder head.

Answer is: