Which of the following statements is INCORRECT?

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SSC JE Mechanical 11 Oct 2023 Shift 2 Official Paper-I
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  1. The value of dryness fraction always lies between 0 and 1.
  2. The value of dryness fraction is 0 for saturated water condition.
  3. The value of dryness fraction is 1 for saturated steam condition.
  4. The value of dryness fraction is greater than 1 for superheated steam condition. 

Answer (Detailed Solution Below)

Option 4 : The value of dryness fraction is greater than 1 for superheated steam condition. 
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Detailed Solution

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Explanation:

Dryness fraction is defined as the ratio of mass of dry steam (vapour) to combined mass of dry steam (vapour) & mass of liquid in mixture. It is denoted by x.

For saturated liquid x = 0

For saturated vapour = 1

The value of dryness fraction lies between 0 and 1.

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