Exercise: Heat Transfer Refrigeration And Air Conditioning

Questions for: Heat Transfer Refrigeration And Air Conditioning

Most air cooled condensers are designed to operate with a temperature difference of
A:
5°C
B:
8°C
C:
14°C
D:
22°C
Answer: C
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In a black body, all radiations are rejected.
A:
True
B:
False
C:
D:
Answer: B
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The refrigerant used for absorption refrigerators working on heat from solar collectors is a mixture of water and
A:
carbon dioxide
B:
sulphur dioxide
C:
lithium bromide
D:
R-12
Answer: C
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The by-pass factor (B. P. F.) in case of sensible heating of air is (Where td1 = Dry bulb temperature of air entering the heating coil, td2 = Dry bulb temperature of air leaving the heating coil, and td3 = Dry bulb temperature of heating coil)
A:
B:
C:
D:
Answer: B
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The boiling point of ammonia is
A:
-10.5°C
B:
-30°C
C:
-33.3°C
D:
-77.7°C
Answer: C
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