Wet bulb temperature is the temperature of air recorded by a thermometer, when?

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  1. It is not affected by the moisture present in the air
  2. Its bulb is surrounded by a wet cloth exposed to the air
  3. The moisture present in it begins to condense
  4. None of the above

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Answer: Option 2

Wet-bulb temperature. The wet-bulb temperature (WBT) is the temperature read by a thermometer covered in water-soaked cloth (wet-bulb thermometer) over which air is passed. At 100% relative humidity, the wet-bulb temperature is equal to the air temperature (dry-bulb temperature) and it is lower at lower humidity.

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