Heat Transfer Refrigeration and Air Conditioning MCQ with Answers

11) The relative humidity is defined as

the mass of water vapour present in 1 m³ of dry air

the mass of water vapour present in 1 kg of dry air

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.

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 is:

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

12) The heat transfer by conduction through a thick sphere is same as through a thick cylinder.

Answer is:

Incorrect

13) In aqua-ammonia and Lithium-bromide water absorption refrigeration systems, the refrigerants are respectively

Answer is:

ammonia and water

14) As relative humidity decreases, the dew point temperature will be __________ wet bulb temperature.

Answer is:

lower than

15) The process of heat transfer from a hot body to a cold body, in a straight line, without affecting the intervening medium, is called radiation.

Answer is:

11) The relative humidity is defined as

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

12) The heat transfer by conduction through a thick sphere is same as through a thick cylinder.

Incorrect

13) In aqua-ammonia and Lithium-bromide water absorption refrigeration systems, the refrigerants are respectively

ammonia and water

14) As relative humidity decreases, the dew point temperature will be __________ wet bulb temperature.

lower than

15) The process of heat transfer from a hot body to a cold body, in a straight line, without affecting the intervening medium, is called radiation.

Correct