Mechanical Engineering - Steam Nozzles and Turbines

Exercise :: Steam Nozzles and Turbines - Section 2

26. 

The reheat factor depends upon

A. initial pressure and superheat
B. exit pressure
C. turbine stage efficiency
D. all of these

Answer: Option D

Explanation:

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27. 

In an impulse turbine

A. the steam is expanded in nozzles only and there is a pressure drop and heat drop
B. the steam is expanded both in fixed and moving blades continuously
C. the steam is expanded in moving blades only
D. the pressure and temperature of steam remains constant

Answer: Option A

Explanation:

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28. 

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: Option A

Explanation:

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29. 

The ratio of the cumulative heat drop to the isentropic heat drop is called reheat factor.

A. Yes
B. No

Answer: Option A

Explanation:

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30. 

The compounding of turbines is done in order to

A. reduce speed of rotor
B. improve efficiency
C. reduce exit losses
D. all of these

Answer: Option D

Explanation:

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