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Question 1. The relative humidity is defined as
  1.     The mass of water vapour present in 1 m3 of dry air
  2.     The mass of water vapour present in 1 kg of dry air
  3.     The ratio of the actual mass of water vapour in a unit mass of dry air to the mass of water vapour in the same mass of dry air when it is saturated at the same temperature and pressure
  4.     The ratio of actual mass of water vapour in a given volume of moist air to the mass of water vapour in the same volume of saturated air at the same temperature and pressure
Answer: Option D
Explanation :

Question 2. The relative humidity is defined as
  1.     The mass of water vapour present in 1 m3 of dry air
  2.     The mass of water vapour present in 1 kg of dry air
  3.     The ratio of the actual mass of water vapour in a unit mass of dry air to the mass of water vapour in the same mass of dry air when it is saturated at the same temperature and pressure
  4.     The ratio of actual mass of water vapour in a given volume of moist air to the mass of water vapour in the same volume of saturated air at the same temperature and pressure
Answer: Option D
Explanation :

Question 3. The dry bulb temperature during sensible heating of air
  1.     Remains constant
  2.     Increases
  3.     Decreases
  4.     None of these
Answer: Option B
Explanation :

Question 4. Moisture in freon refrigeration system causes
  1.     Ineffective refrigeration
  2.     High power consumption
  3.     Freezing automatic regulating valve
  4.     Corrosion of whole system
Answer: Option C
Explanation :

Question 5. The wet bulb temperature during sensible cooling of air
  1.     Remains constant
  2.     Increases
  3.     Decreases
  4.     None of these
Answer: Option C
Explanation :

Question 6. The dry bulb temperature during sensible heating of air
  1.     Remains constant
  2.     Increases
  3.     Decreases
  4.     None of these
Answer: Option B
Explanation :