Mass Transfer

Q1: Dry bulb temperature of unsaturated air is more than its __________ temperature.

A dew point

B wet bulb

C both 'a' & 'b'

D neither 'a' nor 'b'

ANS:C - both 'a' & 'b'

The dry bulb temperature of unsaturated air is always higher than both its dew point temperature and wet bulb temperature.

  • Dew point temperature: This is the temperature at which the air becomes saturated with water vapor, leading to condensation. It represents the temperature at which the air has reached its maximum humidity given its current pressure and moisture content.
  • Wet bulb temperature: This is the lowest temperature that can be reached by the evaporation of water into the air at constant pressure. It's typically lower than the dry bulb temperature because the process of evaporation cools the air.
Since the dry bulb temperature is a measure of the actual temperature of the air and is not influenced by the presence of moisture, it is always higher than both the dew point and wet bulb temperatures. Therefore, the correct answer is neither 'a' nor 'b'.



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