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As relative humidity decreases, the dew point will be

This question was previously asked in
UKPSC JE Mechanical 2013 Official Paper II
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  1. lower than wet bulb temperature
  2. higher than wet bulb temperature
  3. equal to wet bulb temperature
  4. None of these

Answer (Detailed Solution Below)

Option 1 : lower than wet bulb temperature
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Detailed Solution

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Explanation:

For sensible heating process

  1. Dry Bulb Temperature increases
  2. Wet Bulb Temperature increases
  3. Dew Point Temperature, Specific humidity and vapour pressure remains constant
  4. Enthalpy increases
  5. Relative humidity decreases

As relative humidity decreases, the dew point will be lower than wet bulb temperature.

Psychrometric chart for sensible Heating

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