Exercise: Steam Nozzles And Turbines

Questions for: Steam Nozzles And Turbines

When the cross-section of a nozzle first increases from its entrance to throat, and then decreases from its throat to exit, it is not a convergent-divergent nozzle.
A:
Yes
B:
No
C:
D:
Answer: A
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The ratio of the isentropic heat drop to the heat supplied, is called
A:
reheat factor
B:
stage efficiency
C:
internal efficiency
D:
Rankine efficiency
Answer: D
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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
Answer: D
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The efficiency of a pressure-velocity compounded impulse turbine is __________ as compared to pressure compounded impulse turbine.
A:
same
B:
less
C:
more
D:
Answer: B
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The critical pressure ratio for gases is
A:
0.528
B:
0.546
C:
0.577
D:
0.582
Answer: A
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