The effect of friction in the nozzle __________ dryness fraction of steam.
A. has no effect on
B. decreases
C. increases
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C) The effect of friction in the nozzle increases dryness fraction of stream.
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The ‘effect of friction’ in the nozzle increases dryness fraction of steam.
Answer: Option C
Explanation:
The ‘effect of friction’ reduces the velocity of steam but the dryness fraction of the superheat is increased in the process. The kinetic energy lost in friction is transformed into heat which makes the steam dry due to superheating.
Hence it affects the steam coming out from the nozzle. Most of the friction takes place in the opening or converging part of the nozzle since it has a small opening.
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