89) The pressure ratio of an ideal vaned compressor with increase in mass flow rate

increases

decreases

remains constant

first decreases and then increases

Answer is:

remains constant

large discharge at high pressure

low discharge at high pressure

large discharge at low pressure

low discharge at low pressure

Answer is:

increase

decrease

remain same

may increase/decrease depending on clearance volume

Answer is:

air stream blocking the passage

motion of air at sonic velocity

unsteady periodic and reversed flow

air stream not able to follow the blade contour

Answer is:

centrifugal compressors deliver prac-tically constant pressure over a considerable range of capacities

Axial flow compressors have a sub-stantially constant delivery at variable pressures

centrifugal compressors have a wider stable operating range than axial flow compressors

axial flow compressors are bigger in diameter compared to centrifugal type

Answer is: