Refrigeration And Air Conditioning question and answer for competitive exams
31. The refrigerant- 717 is
(A) Sulphur dioxide
(B) Ammonia
(C) Methyl chloride
(D) Carbon dioxide
32. Regarding ‘Dry ice’ which of the following statements is correct?
(A) It does not contain impurities
(B) It is solidified form of CO2
(C) It is free from water
(D) None of the above
33. The colour of flame during halide torch test for refrigerant leaks will change to
(A) Gray
(B) Blue of bright green
(C) Black
(D) Pink of red
34. During sensible heating of most air, enthalpy
(A) Increases
(B) Deceases
(C) Remains constant
(D) None of the above
35. Absolute humidity is the mass of water vapour present in
(A) 1 kg of dry air
(B) 1 m3 of dry air
(C) 1 kg of wet air
(D) 1 m3 of wet air
36. As warns air cools, its relative humidity…………….
(A) Decreases
(B) Increases
(C) Remains unchanged
(D) Unpredictable
37. In air-conditioning system the comfort conditions are defined by
(A) 15C DBT, 90% RH
(B) 25C DBT, 35% RH
(C) 20C DBT, 80% RH
(D) 22C DBT, 60% RH
38. In a cooling tower, the dissipation of heat is mainly due to
(A) Evaporation
(B) Conduction
(C) Convection
(D) Radiation
39. In air-conditioning system the quantity of free air required per person is usually taken
(A) 0.8 m3/min
(B) 1.2m3/min
(C) 3m3/min
(D) 5m3/min
40. Which of the following permanents remain constant during sensible heating/cooling?
(A) Enthalpy
(B) Wet bulb temperature
(C) Humidity ratio
(D) Dry bulb temperature
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