Question

The effect of considering friction in steam nozzle for the same pressure ratio leads to
1. Increase in dryness fraction of exit steam 
2. Decrease in dryness fraction of exit steam
3. No change in the quality of exit steam
4. Decrease or increase of dryness fraction of exit steam depending upon inlet quality 

Answer 1

Correct Answer - Option 1 : Increase in dryness fraction of exit steam 

Concept:

The effects of steam nozzle friction are:

• Reduction in enthalpy drop.
• Increase in specific volume
• Steam is reheated i.e. quality of vapor at the exit is improved means dryness fraction increases.

• Decrease in mass flow rate
• Reduction in exit velocity.