The effect of considering friction losses in steam nozzle for the same pressure ratio leads to

The effect of considering friction in steam nozzles for the same pressure ratio leads to

A

increase in dryness fraction of exit steam

B

decrease in dryness fraction of exit steam

C

no change in the quality of exit steam

D

decrease or increase of dryness fraction of exit steam depending upon inlet quality

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

Under-damping

C

Over-damping

D

None of these

The effect of friction on the flow of steam through a nozzle is to decrease the __________ of steam.

A

Wetness

B

Mass flow rate

C

Both A & B

D

Neither A nor B

The ratio of exit pressure to inlet pressure of maximum mass flow rate per area of steam through a nozzle when steam is initially superheated is

A

0.555

B

0.578

C

0.5457

D

0.6

The ratio of exit pressure to inlet pressure for maximum mass flow rate per unit area of steam through a nozzle when steam is initially dry saturated is

A

0.6

B

0.578

C

0.555

D

0.5457

The effect of friction on the flow of steam through a nozzle is to

A

Decrease the mass flow rate and to increase the wetness of steam

B

Increase the mass flow rate and to increase the exit temperature

C

Decrease the mass flow rate and to decrease the wetness of steam

D

Increase the exit temperature without any effect on mass flow rate

The effect of friction in the nozzle __________ dryness fraction of steam.

A

Has no effect on

B

Decreases

C

Increases

D

None of these

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

D

None of these

The friction present between the steam and the nozzle surfaces reduces the heat drop by

A

10 to 15%

B

15 to 25%

C

25 to 40%

D

40 to 60%

The friction in the nozzle __________ exit velocity of steam.

A

Has no effect on

B

Decreases

C

Increases

D

None of these

The effect of considering friction losses in steam nozzle for the same pressure ratio leads to

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