When water is sprayed on air, passing through an insulated chamber maintained at a temperature higher than the dew point of entering air but lower than its dry bulb temperature, then the air is

ANS:C - cooled and humidified.

When water is sprayed on air passing through an insulated chamber maintained at a temperature higher than the dew point of entering air but lower than its dry bulb temperature, it undergoes an adiabatic saturation process. In this process:

• The water droplets evaporate into the air, absorbing heat from the surrounding air.
• The evaporation causes the air temperature to decrease (cooling effect) and its humidity to increase (humidification).
• Since the chamber is insulated and no heat is added or removed from the system, the process is adiabatic, meaning there is no heat exchange with the surroundings.