The wet bulb temperature is a measure of __________ humidity 

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ISRO IPRC Technical Assistant Mechanical 10 Dec 2016 Official Paper
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  1. Relative
  2. Absolute
  3. Specific
  4. None of the above

Answer (Detailed Solution Below)

Option 1 : Relative
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Detailed Solution

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Explanation:

Wet-bulb temperature:

  • It is the temperature obtained by an accurate thermometer having a wick moistened with distilled water
  • Wet-bulb temperature is the measure of relative humidity
  • If air is saturated then its relative humidity is 100% that means it can't absorb more moisture, therefore if it is being made to pass over the water it will not absorb the moisture consequently and its temperature will not change.

gateme 5jun 2018 3

Additional Information

Every psychometric chart includes vertical lines that represent the dry bulb temperatures, the diagonals line represents wet bulb temperature and the curved lines represent relative humidity.

  • Dry Bulb Temperature: Actual temperature of gas or mixture of gases.
  • Dew point temperature: Temperature at which the liquid droplets just appear when the moist air is cooled continuously.

When the relative humidity of the air is 100%, i.e the air is saturated, the dew point temperature (DPT) equals the wet-bulb temperature (WBT), which is also equal to the dry-bulb temperature.

So DBT = WBT = DPT

For unsaturated air:

DBT > WBT > DPT

6 (1)

Psychrometry chart:

7 (4)

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