Exercise: Steam Nozzles And Turbines

Questions for: Steam Nozzles And Turbines

The impulse reaction turbine has its driving force
A:
as an impulsive force
B:
as a reaction force
C:
partly as an impulsive force and partly as a reaction force
D:
none of the above
Answer: C
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The isentropic enthalpy drop in moving blade is two-third of the isentropic enthalpy drop in fixed blades of a turbine. The degree of reaction will be
A:
0.4
B:
0.56
C:
0.67
D:
1.67
Answer: A
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The critical pressure ratio for initially wet steam is
A:
0.546
B:
0.577
C:
0.582
D:
0.601
Answer: C
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In a nozzle, whole frictional loss is assumed to occur between
A:
inlet and thoroat
B:
inlet and outlet
C:
throat and exit
D:
all of these
Answer: C
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The velocity of steam leaving the nozzle (V) is given by (where K = Nozzle coefficient or nozzle efficiency, and hd = Enthalpy or heat drop during expansion of steam in a nozzle)
A:
V = 44.72 hd K
B:
V = 44.72 K hd
C:
V = 44.72 K hd
D:
V = 44.72 K hd
Answer: C
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