Refrigeration And Air Conditioning - Study Mode

[#236] The boiling point of ammonia is
Correct Answer

(C) -33.3°C

Explanation

Solution: The boiling point of ammonia is -33.3°C

[#237] Moisture in Freon refrigeration system causes
Correct Answer

(C) Freezing automatic regulating valve

Explanation

Solution: Moisture in Freon refrigeration system causes Freezing automatic regulating valve

[#238] A refrigerating system operating on reversed Brayton refrigeration cycle is used for maintaining 250 K. If the temperature at the end of constant pressure cooling is 300 K and rise in the temperature of air in the refrigerator is 50 K, then the net work of compression will be (assume air as working substance with Cp = 1 kJ/kg)
Correct Answer

(B) 50 kJ/kg

Explanation

Solution: A refrigerating system operating on reversed Brayton refrigeration cycle is used for maintaining 250 K. If the temperature at the end of constant pressure cooling is 300 K and rise in the temperature of air in the refrigerator is 50 K, then the net work of compression will be 50 kJ/kg

[#239] The relative humidity is defined as
Correct Answer

(D) 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

Explanation

Solution: 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.

[#240] The wet bulb temperature during sensible cooling of air
Correct Answer

(C) Decreases

Explanation

Solution: The wet bulb temperature during sensible cooling of air Decreases