Mechanical Engineering - Steam Nozzles and Turbines

Exercise :: Steam Nozzles and Turbines - Section 1

6. 

The discharge of steam in a convergent-divergent nozzle __________ after the throat (i.e. in the divergent portion of the nozzle)

A. remains constant
B. decreases
C. increases

Answer: Option A

Explanation:

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7. 

The rate of discharge through the nozzle __________ when the exit pressure is gradually reduced.

A. remains same
B. decreases
C. increases

Answer: Option C

Explanation:

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8. 

The velocity of steam leaving the nozzle (V) is given by (where K = Nozzle coefficient or nozzle efficiency, and hd = Enthalpy or heat drop during expansion of steam in a nozzle)

A. V = 44.72 hd K
B. V = 44.72 K hd
C. V = 44.72 K hd
D. V = 44.72 K hd

Answer: Option C

Explanation:

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9. 

In a nozzle, whole frictional loss is assumed to occur between

A. inlet and thoroat
B. inlet and outlet
C. throat and exit
D. all of these

Answer: Option C

Explanation:

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10. 

The critical pressure ratio for initially wet steam is

A. 0.546
B. 0.577
C. 0.582
D. 0.601

Answer: Option C

Explanation:

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