Rotary compressors are suitable for ____________________?

Related Mcqs:

1. Clearance volume in actual reciprocating compressors is essential __________________?

   A. to accommedate Valves in the cylinder head
   B. to provide cushioning effect
   C. to attain high volumetric efficiency
   D. to avoid mechanical bang of piston with cylinder head
   E. to provide cushioning effect and also to avoid mechanical bang of piston with cylinder head

2. Volumetric efficiency of air compressors is of the order of________________?

   A. 20-30%
   B. 40-50%
   C. 60-70%
   D. 70-90%
   E. 90-100%

3. During peak load periods, the best method of controlling compressors is___________________?

   A. start-stop motor
   B. constant speed unloader
   C. relief valve
   D. variable speed
   E. none of the above

4. Maximum temprature in a gas turbine is of the order of COMPRESSORS, GAS TURBINES AND JET ENGINES______________________?

   A. 2500°C
   B. 2000°C
   C. 1500°C
   D. 1000°C
   E. 700°C

5. 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

6. 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

7. 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

8. 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

9. 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______________?

   A. Vi=V0B
   B. Vt>V0
   C. U,<V0
   D. V,= U0
   E. Vri=Vm

10. Turbofan engine employs ____________________ ?

    A. one air stream
    B. two or more air streams
    C. no air stream
    D. solid fuel firing
    E. rocket principle for its operation