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Refrigeration and Air Conditioning - Interview Questions and Answers

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41. Domestic refrigerator working on vapour compression cycle uses the following type of expansion device
A. electrically operated throttling valve
B. manually operated valve
C. thermostatic valve
D. capillary tube
E. expansion valve.
Explanation:
42. The vapour pressure of refrigerant should be
A. lower than atmospheric pressure
B. higher than atmospheric pressure
C. equal to atmospheric pressure
D. could be anything
E. none of the above.
Explanation:
43. At lower temperatures and pressures, the latent heat of vaporisation of a refrigerant
A. decreases
B. increases
C. remains same
D. depends on other factors
E. none of the above.
Explanation:
44. If a heat pump cycle operates between the condenser temperature of +27�C and evaporator temperature of - 23�C, then the Carnot COP will be
A. 0.2
B. 1.2
C. 5
D. 6
E. 10.
Explanation:
45. In vapour compression cycle, the condition of refrigerant is very wet vapour
A. after passing through the condenser
B. before passing through the condenser
C. after passing through the expansion or throttle valve
D. before entering the expansion valve
E. before entering the compressor.
Explanation:
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