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

Related Mcqs:

1. 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

2. 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

3. 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__________?

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

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. Steam turbines commonly used in steam power station are__________?

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

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 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

8. Rankine efficiency of a steam power plant____________?

   A. improves in summer as compared to that in winter
   B. improves in winter as compared to that in summer
   C. is unaffected by climatic conditions
   D. none of the above

9. The modern steam turbines are___________?

   A. impulse turbines
   B. reaction turbines
   C. impulse-reaction turbines
   D. none of the above

10. In steam turbines the reheat factor_____________?

    A. increases with the increase in number of stages
    B. decreases with the increase in number of stages
    C. remains same irrespective of number of stages
    D. none of the above