SSC JE Mechanical Engineering 27 Sep 2019 Shift 1 Paper

Question : 156 of 200

Marks: +1, -0

Dry saturated steam at a pressure of 8 bar enters a convergent nozzle. The index of isentropic expansion for dry saturated steam is 1.135. For maximum mass flow rate to occur through the nozzle, the exit pressure should be:

5.32 bar
3.62 bar
2.32 bar
4.62 bar

Validate

Solution:

Given:
Exit pressure

P_{1}=8 {\bar}, {n}=1.135

{{P}_{2}}/{{P}_{1}}=({2}/{{n}+1})^{{{n}}/{{n}-1}}

{{P}_{2}}/{{P}_{1}}=({2}/{1.135+1})^{{1.135}/{1.135-1}}=0.577

{P}_{2}=8 \×0.577=4.62 {\bar}

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