Exercise: Steam Nozzles And Turbines

Questions for: Steam Nozzles And Turbines

A nozzle is said to be a divergent nozzle
A:
when the cross-section of the nozzle increases continuously from entrance to exit
B:
when the cross-section of the nozzle decreases continuously from entrance to exit
C:
when the cross-section of the nozzle first decreases from entrance to throat and then increases from its throat to exit
D:
none of the above
Answer: A
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The reheat factor depends upon
A:
initial pressure and superheat
B:
exit pressure
C:
turbine stage efficiency
D:
all of these
Answer: D
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De-Laval turbines are mostly used
A:
where low speeds are required
B:
for small power purposes and low speeds
C:
for large power purposes
D:
for small power purposes and high speeds
Answer: D
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The purpose of governing in steam turbines is to
A:
maintain the speed of the turbine
B:
reduce the effective heat drop
C:
reheat the steam and improve its quality
D:
completely balance against end thrust
Answer: A
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The efficiency ratio is the ratio of total useful heat drop to the total isentropic heat drop.
A:
Agree
B:
Disagree
C:
D:
Answer: A
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