Exercise: Steam Nozzles And Turbines

Questions for: Steam Nozzles And Turbines

The pressure of steam at throat of a steam nozzle is called critical pressure.
A:
Agree
B:
Disagree
C:
D:
Answer: A
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The flow of steam is super-sonic
A:
at the entrance to the nozzle
B:
at the throat of the nozzle
C:
in the convergent portion of the nozzle
D:
in the divergent portion of the nozzle
Answer: D
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In a De-Laval impulse turbine, the nozzle is kept very close to the blades.
A:
Yes
B:
No
C:
D:
Answer: A
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A single stage impulse turbine with a diameter of 1.2 m runs at 3000 r.p.m. If the blade speed ratio is 0.42, then the inlet velocity of steam will be
A:
79 m/s
B:
188 m/s
C:
450 m/s
D:
900 m/s
Answer: C
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In a reaction turbine, when steam flows through the fixed blades,
A:
pressure increases while velocity decreases
B:
pressure decreases while velocity increases
C:
pressure and velocity both decreases
D:
pressure and velocity both increases
Answer: B
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