If V, U and Vr represent the absolute velocity of fluid, velocity of blade, and relative velocity of fluid, and suffix i and o stand for entry and exit conditions, then in a rotary machine whose degree of reaction is unity______________?

Related Mcqs:

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

2. 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

3. The air entry velocity m a rocket as compared to aircraft is_________________?

   A. same
   B. more
   C. less
   D. zero
   E. dependent on power and speed

4. Rotary compressor is best suited for_____________________?

   A. large quantity of air at high pressure
   B. small quantity of air at high pressure
   C. small quantity of air at low pressure
   D. large quantity of air at low pressure
   E. any one of the above

5. The thermodynamic efficiency of rotary compressor is based on_______________?

   A. isothermal compression
   B. adiabatic compression
   C. isentropic compression
   D. polytropic compression
   E. none of the above

6. Maximum delivery pressure is a rotary air compressor is of the order of__________________?

   A. 6 kg/cm2
   B. 10 kg/cm2
   C. 16 kg/cm2
   D. 25 kg/cm2
   E. 40 kg/cm2

7. The criterion of the thermodynamic efficiency for rotary compressor is_________________?

   A. isentropic compression
   B. isothermal compression
   C. polytropic compression
   D. any one of the above
   E. none of the above

8. Rotary compressors are suitable for ____________________?

   A. large discharge at high pressure
   B. low discharge at high pressure
   C. large discharge at low pressure
   D. low discharge at low pressure
   E. there is no such limitation

9. A rocket works with maximum overall efficiency when air craft velocity is equal to the_________________?

   A. jet velocity
   B. twice the jet velocity
   C. half the jet velocity
   D. average of the jet velocity
   E. no such co-relationship with jet velocity exists

10. In turbo fan engine, the jet velocity as compared to turbo-jet engine is_________________?

    A. less
    B. more
    C. same
    D. may be less or more depening upon speed
    E. none of the above