A mass of wet steam contains 15% liquid water. The dryness fraction of steam is

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ISRO IPRC Technical Assistant Mechanical 21 April 2016 Official Paper
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  1. 0.15
  2. 0.85
  3. 1.15
  4. None of these

Answer (Detailed Solution Below)

Option 2 : 0.85
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Detailed Solution

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Concept:

Dryness fraction is defined as the ratio of the mass of dry steam and the combined mass of dry steam & mass of water vapour in the mixture. It is denoted by x.

  • For saturated liquid x = 0
  • For saturated vapor = 1

The value of dryness fraction lies between 0 and 1.

Calculation:

Given:

ml = 15, mv = 85.

x = 0.85

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