Exercise: Steam Nozzles And Turbines

Questions for: Steam Nozzles And Turbines

The critical pressure ratio is given by (where p1 = Initial pressure of steam, and p2 = Pressure of steam at throat or critical pressure)
A:
p1 p2
B:
p1/p2
C:
p2/p1
D:
p1 + p2
Answer: C
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In velocity compounding of an impulse turbine, the expansion of steam takes place in a nozzle or a set of nozzles from the boiler pressure to condenser pressure.
A:
True
B:
False
C:
D:
Answer: A
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In a reaction turbine, when steam flows through the moving 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: C
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During flow through a nozzle, no heat is supplied or rejected by the steam.
A:
Agree
B:
Disagree
C:
D:
Answer: A
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In an ideal impulse turbine, the
A:
absolute velocity at the inlet of moving blade is equal to that at the outlet
B:
relative velocity at the inlet of the moving blade is equal to that at the outlet
C:
axial velocity at inlet is equal to that at the outlet
D:
whirl velocity at inlet is equalto that at the outlet
Answer: B
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