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Steam Nozzles And Turbines
Steam Nozzles And Turbines
Exercise: Steam Nozzles And Turbines
📂 Steam Nozzles And Turbines
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Questions for: Steam Nozzles And Turbines
The velocity of whirl at outlet for an axial discharge turbine is
A:
minimum
B:
maximum
C:
zero
D:
Answer:
C
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The efficiency of an impulse turbine is maximum when (where
V
b
= Blade speed,
V
= Absolute velocity of steam entering the blade, and α = Nozzle angle)
A:
V
b
= 0.5
V
cos α
B:
V
b
=
V
cos α
C:
V
b
= 0.5
V
2
cos α
D:
V
b
=
V
2
cosα
Answer:
A
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For a Parson's reaction turbine, if α
1
and α
2
are fixed blade angles at inlet and exit respectively and β
1
and β
2
are the moving blade angles at entrance and exit respectively, then
A:
α
1
= α
2
and β
1
= β
2
B:
α
1
= β
1
and α
2
= β
2
C:
α
1
< β
1
and α
2
> β
2
D:
α
1
= β
2
and β
1
= α
2
Answer:
D
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The critical pressure ratio for initially superheated steam is __________ as compared to initially dry saturated steam.
A:
more
B:
less
C:
D:
Answer:
B
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Post
The expansion of steam, as it flows over the blades in reaction turbine, represents
A:
isothermal process
B:
isentropic process
C:
throttling process
D:
free-expansion process
Answer:
B
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