Refrigeration and Air Conditioning

41. In vapour compression cycle the condition off refrigerant is dry saturated vapour

1. after passing through the condenser
2. before passing through the condenser
3. after passing through the expansion or throttle valve
4. before entering the expansion valve
5. before entering the compressor

View answer

42. In vapour compression cycle using NH3 as refrigerant, initial charge is filled at

1. suction of compressor
2. delivery of compressor
3. high pressure side close to receiver
4. low pressure side near receiver
5. anywhere in the cycle.

View answer

43. In vapour compression cycle, the conditii of refrigerant is saturated liquid

1. after passing through the condenser
2. before passing through the condensei
3. after passing through the expansion throttle valve
4. before entering the expansion valve
5. before entering the compressor.

View answer

44. In vapour compression cycle, the condition of refrigerant is high pressure saturated liquid

1. after passing through the condenser
2. before passing through the condenser
3. after passing through the expansion or thiottle valve
4. before entering the expansion valve
5. before entering the compressor.

View answer

45. In vapour compression cycle, the condition of refrigerant is very wet vapour

1. after passing through the condenser
2. before passing through the condenser
3. after passing through the expansion or throttle valve
4. before entering the expansion valve
5. before entering the compressor.

View answer

46. In vapour compression refrigeration system, refrigerant occurs as liquid between

1. condenser and expansion valve
2. compressor and evaporator
3. expansion valve and evaporator
4. compressor and condenser
5. none of the above.

View answer

47. Mass flow ratio of NH3 in comparison to Freon-12 for same refrigeration load and same temperature limits is of the order of

1. 01:01
2. 01:09
3. 09:01
4. 01:03
5. 03:01

View answer

48. Moisture in freon refrigeration system causes

1. ineffective refrigeration
2. high power consumption
3. freezing automatic regulating valve
4. corrosion of whole system
5. breakdown of refrigerant.

View answer

49. Most of the domestic refrigerators work on the following refrigeration system

1. vapour compression
2. vapour absorption
3. carnot cycle
4. electrolux refrigerator
5. dual cycle.

View answer

50. On the pressure-enthalpy diagram, condensation and desuperheating is represented by a horizontal line because the process

1. involves no change in volume
2. takes place at constant temperature
3. takes place at constant entropy
4. takes place at constant enthalpy
5. takes place at constant pressure.

View answer