28) Volumetric efficiency is

the ratio of stroke volume to clearance volume

the ratio of the air actually delivered to the amount of piston displacement

reciprocal of compression ratio

index of compressor performance

Answer is:

the ratio of the air actually delivered to the amount of piston displacement

20-30%

40-50%

60-70%

70-90%

Answer is:

increases with increase in compression ratio

decreases with increase in compression ratio

in not dependent upon compression ratio

may increase/decrease depending on compressor capacity

Answer is:

increases with increase in compression ratio

decreases with increase in compression ratio

is not dependent upon compressin ratio

may increase/decrease depending on compressor capacity

Answer is:

it allows maximum compression to be achieved

it greatly affects volumetric efficiency

it results in minimum work

it permits isothermal compression

Answer is: