A. larger air handling ability per unit frontal area
B. higher pressure ratio per stage
C. aerofoil blades are used
D. higher average velocities
E. none of the above
Related Mcqs:
- Axial flow compressor resembles____________________ ?
A. centrifugal pump
B. reciprocating pump
C. turbine
D. sliding vane compressor
E. none of the above - The effective power of gas turbines is increased by adding the following in compressor__________________?
A. ammonia and water vapour
B. carbon dioxide
C. nitrogen
D. hydrogen
E. none of the above - Isothermal compression effeicency can be attained by running the compressor__________________?
A. at very high speed
B. at very slow speed
C. at average speed
D. at zero speed
E. isothermally - A centrifugal compressor works on the principle of__________________?
A. conversion of pressure energy into kinetic energy
B. conversion of kinetic energy into pres¬sure energy
C. centripetal action
D. generating pressure directly
E. combination of A. and D. - The thrust on the rotor in a centrifugal compressor is produced by________________?
A. radial component
B. axial component
C. tangential component
D. resultant component - Losses in a centrifugal compressor are due to__________________?
A. inlet losses
B. impeller channel losses
C. diffuser losses
D. all of the above
E. none of the above - The ratio of outlet whirl velocity to blade velocity in case of centrifugal compressor is called__________________?
A. slip factor
B. velocity factor
C. velocity coefficient
D. blade effectiveness - The maximum compression ratio in an actual single stage axial flow comperssor is of the order of________________?
A. 1 : 1.2
B. 1 : 2
C. 1 : 5
D. 1 : 10
E. 1 : 1 - The degree of reaction of an axial flow turbine is the ratio of isentropic temperature drop in a blade row to the_____________________?
A. adiabatic temperature drop in the stage
B. total temperature drop
C. total temperature drop in the stage
D. total adiabaitc temperature drop
E. difference of maximum and minimum temperature in the cycle - In the axial flow gas turbine, the work ratio is the ratio of____________________?
A. compressor work and turbine work
B. output and input
C. actual total head tempeature drop to the isentrpic total head drop from total head inlet to static head outlet
D. actual compressor work and theoretical comprssor work
E. none of the above
