The ratio of exit pressure to inlet pressure of maximum mass flow rate per area of steam through a nozzle when steam is initially superheated is__________?

Related Mcqs:

1. The ratio of exit pressure to inlet pressure for maximum mass flow rate per unit area of steam through a nozzle when steam is initially dry saturated is___________?

   A. 0.6
   B. 0.578
   C. 0.555
   D. 0.5457

2. The isentropic expansion of steam through nozzle for the steam initially superheated at inlet is approximated by equation__________?

   A. pvls=C
   B. pv1126 = C
   C. pv1A = C
   D. pv = C

3. The isentropic expansion of steam through nozzle for the steam initially dry saturated at inlet is approximated by equation?

   A. pv = C
   B. pv1A = C
   C. pv1i = C
   D. pv

4. The effect of considering friction losses in steam nozzle for the same pressure ratio leads to________?

   A. increase in exit velocity from the nozzle
   B. decrease in exit velocity from the nozzle
   C. no change in exit velocity from the nozzle
   D. increase or decrease depending upon the exit quality of steam

5. The critical pressure ratio of a convergent nozzle is defined as_____________?

   A. the ratio of outlet pressure to inlet pressure of nozzle
   B. the ratio of inlet pressure to outlet pressure of nozzle
   C. the ratio of outlet pressure to inlet pressure only when mass flow rate per unit area is minimum
   D. the ratio of outlet pressure to inlet pressure only when mass flow rate = c

6. Steam pressure in a steam power station, which is usually kept now-a-days is of the order of____________?

   A. 20 kgf/cm2
   B. 50 kgf/cm2
   C. 100 kgf/cm2
   D. 150 kgf/cm2

7. The effect of considering friction in steam nozzles for the same pressure ratio leads to_________?

   A. increase in dryness fraction of exit steam
   B. decrease in dryness fraction of exit steam
   C. no change in the quality of exit steam
   D. decrease or increase of dryness fraction of exit steam depending upon inlet quality

8. Steam turbines commonly used in steam power station are__________?

   A. condensing type
   B. non-condensing type
   C. none of the above

9. In a steam power plant, the function of a condenser is__________?

   A. to maintain pressure below atmospheric to increase work output from the primemover
   B. to receive large volumes of steam exhausted from steam prime mover
   C. to condense large volumes of steam to water which may be used again in boiler
   D. all of the above

10. The pressure on the two sides of the impulse wheel of a steam turbine_____?

    A. is same
    B. is different
    C. increases from one side to the other side
    D. decreases from one side to the other side