Exercise: Steam Nozzles And Turbines

Questions for: Steam Nozzles And Turbines

The expansion of steam in a nozzle follows
A:
Carnot cycle
B:
Rankine cycle
C:
Joule cycle
D:
Stirling cycle
Answer: B
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Degree of reaction is defined as the ratio of
A:
heat drop in fixed blades to the heat drop in moving blades
B:
heat drop in moving blades to the heat drop in fixed blades
C:
heat drop in moving blades to the heat drop in fixed blades plus heat drop in moving blades
D:
heat drop in fixed blades plus heat drop in moving blades to the heat drop in moving blades
Answer: C
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An impulse turbine as compared to a reaction turbine, for a given power has __________ row of blades.
A:
equal
B:
less
C:
more
D:
Answer: C
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The friction present between the steam and the nozzle surfaces reduces the heat drop by
A:
10 to 15 percent
B:
15 to 25 percent
C:
25 to 40 percent
D:
40 to 60 percent
Answer: A
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In impulse turbines, when friction is neglected, the relative velocity of steam at outlet tip of the blade is __________ the relative velocity of steam at inlet tip of the blade.
A:
equal to
B:
less than
C:
greater than
D:
Answer: A
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