Exercise: Steam Nozzles And Turbines

Questions for: Steam Nozzles And Turbines

The ratio of the workdone on the blades to the energy supplied to the blades, is called
A:
blading efficiency
B:
nozzle efficiency
C:
gross or stage efficiency
D:
mechanical efficiency
Answer: A
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When the back pressure of a nozzle is below the designed value of pressure at exit of nozzle, the nozzle is said to be
A:
choked
B:
underdamping
C:
overdamping
D:
none of these
Answer: B
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Thermal equilibrium means that the flow of steam is
A:
isothermal
B:
isentropic
C:
hyperbolic
D:
polytropic
Answer: B
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The turbine blades do not change the direction of steam issuing from the nozzle.
A:
True
B:
False
C:
D:
Answer: B
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The reheat factor is the ratio of the
A:
cumulative heat drop to the isentropic heat drop
B:
isentropic heat drop to the heat supplied
C:
total useful heat drop to the total isentropic heat drop
D:
none of the above
Answer: A
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