Losses in a centrifugal compressor are due to__________________?

Related Mcqs:

1. 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.

2. The thrust on the rotor in a centrifugal compressor is produced by________________?

   A. radial component
   B. axial component
   C. tangential component
   D. resultant component

3. 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

4. Axial flow compressor has the following advantage over centrifugal compressor__________________?

   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

5. An ideal air compressor cycle without clearance on p-v diagram can be represented by following processes________________?

   A. one adiabatic, two isobaric, and one constant volume
   B. two adiabatic and two isobaric
   C. two adiabatic, one isobaric and one constant volume
   D. one adiabatic, one isobaric and two constant volume
   E. two isobaric, two adiabatic and one constant volume

6. The ratio of work doen per cycle to the swept volume in case of compressor is called ______________?

   A. compression index
   B. compression ratio
   C. compressor efficiency
   D. mean effective pressure
   E. compressor effectiveness

7. The capacity of compressor will be highest when its intake temperature is___________________?

   A. lowest
   B. highest
   C. anything.
   D. atmospheric
   E. none of the above

8. The compressor performance at higher altitude compared to sea level will be _______________?

   A. same
   B. higher
   C. lower
   D. dependent on other factors
   E. none of the above

9. The volumetric efficiency of a compressor falls roughly as follows for every 100 m increase in elevation___________________?

   A. 0.1%
   B. 0.5%
   C. 1.0%
   D. 5%
   E. 10%.

10. The volumetric efficiency of a compressor falls roughly as follows for every 5°C increase in atmospheric temperature__________________?

    A. 0.1%
    B. 0.5%
    C. 1%
    D. 5%
    E. 10%.