11. In a single stage impulse turbine, the velocity of steam approaching nozzles is negligible.
A. True
B. False
12. Curtis turbine is a
A. simple reaction turbine
B. velocity compounded turbine
C. pressure compounded turbine
D. pressure-velocity compounded turbine
13. The velocity of steam at throat of the nozzle is __________ the velocity of sound.
A. equal to
B. less than
C. more than
14. The critical pressure ratio for initially dry saturated steam is
A. 0.546
B. 0.577
C. 0.582
D. 0.601
15. The discharge through a nozzle is maximum for a certain value of exit pressure. This pressure is known as critical pressure.
A. Agree
B. Disagree
16. The velocity of steam, in reaction turbines, is increased in the fixed blades as well as in moving blades.
A. True
B. False
17. The critical pressure ratio for gases is
A. 0.528
B. 0.546
C. 0.577
D. 0.582
18. The efficiency of a pressure-velocity compounded impulse turbine is __________ as compared to pressure compounded impulse turbine.
A. same
B. less
C. more
19. The effect of supersaturation is that the
A. mass of the steam discharged increases
B. entropy and specific volume of the steam increases
C. exit velocity of steam reduces
D. all of these
20. The effect of friction on the flow of steam through a nozzle is to
A. decrease the mass flow rate and to increase the wetness of steam
B. increase the mass flow rate and to increase the exit temperature
C. decrease the mass flow rate and to decrease the wetness of steam
D. increase the exit temperature without any effect on mass flow rate