# Mechanical Engineering - Steam Nozzles and Turbines - Discussion

### Discussion :: Steam Nozzles and Turbines - Section 1 (Q.No.10)

10.

The critical pressure ratio for initially wet steam is

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

Explanation:

No answer description available for this question.

 Lakshmi Kant said: (Jan 17, 2014) The critical pressure ratio in nozzles for max. discharge is, {P2/P1}= [2/(n+1)]^{n/(n-1)}. For saturated steam, n= 1.135. Therefore, P2/P1 = [2/2.135]^(1.135/0.135). = 0.58. Clearly for wet steam, it will be slightly more than the above value. Hence, for wet steam, P2/P1 = 0.582.

 Raj said: (Feb 24, 2014) For wet steam n1=1.132, For super heated steam n2=1.35. So n2>n1 Then value of p2/p1 will decrease from n1 to n2.

 Saikumar said: (Mar 12, 2015) The answer is coming as 0.577 and 0.5776 by substituting above values.

 Saikumar said: (Mar 12, 2015) Steam where most of the process occurs in the wet region: n = 1.135. Steam super heated: n = 1.30. Air: n = 1. 4. Methane: n = 1.31. Helium: n = 1.667.

 Dheena said: (Jul 7, 2015) What is n?

 Sharad said: (Jul 19, 2016) N is the indix for steam. N for superheated steam is 1.135. N for dry saturated steam is 1.3. Then N for wet steam is?

 Raviraj said: (Dec 9, 2016) The answer is 0.577 as for wet stream n=1.135.

 Vijay said: (Dec 22, 2016) The critical pressure ratio is 0.58 because n= 1.135 for wet steam and critical pressure formula is given above.

 Balu said: (Aug 20, 2017) The Exact answer is 0.577.

 Raju said: (Nov 14, 2017) What is the value of n when steam is wet?

 Cr7 said: (Feb 5, 2018) n means? Explain it.

 Sohan said: (Aug 28, 2018) Superheated or supersaturated=0.546. Dry saturated=0.578. Wet=0.582.

 Mani Selvan said: (Jul 26, 2019) For wet steam n=1.113. If substituted in eqn p2/p1=(2/n+1)^(n/n-1), we get p2/p1= 0.581963802, which is approximately equal to 0.582.