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Refrigeration and Air Conditioning - Interview Questions and Answers

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61. A certain refrigerating system has a normal operating suction pressure of 10 kg/cm gauge and condensing pressure of about 67 kg/cm. The refrigerant used is
A. Ammonia
B. Carbon dioxide
C. Freon
D. Brine
E. Hydrocarbon refrigerant.
Explanation:
62. Where does the lowest temperature occur in a vapour compression cycle ?
A. condenser
B. evaporator
C. compressor
D. expansion valve
E. receiver.
Explanation:
63. Aqua ammonia is used as refrigerant in the following type of refrigeration system
A. compression
B. direct
C. indirect
D. absorption
E. none of the above.
Explanation:
64. Which of the following is not a desirable property of a refrigerant
A. high triiscibility with oil
B. low boiling point
C. good electrical conductor
D. large latent heat
E. non-inflammable.
Explanation:
65. On the pressure-enthalpy diagram, condensation and desuperheating is represented by a horizontal line because the process
A. involves no change in volume
B. takes place at constant temperature
C. takes place at constant entropy
D. takes place at constant enthalpy
E. takes place at constant pressure.
Explanation:
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