Mechanical Engineering - Heat Transfer, Refrigeration and Air Conditioning

6.
The boiling point of ammonia is
-10.5°C
-30°C
-33.3°C
-77.7°C
Answer: Option
Explanation:
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7.
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)
Answer: Option
Explanation:
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8.
The refrigerant used for absorption refrigerators working on heat from solar collectors is a mixture of water and
carbon dioxide
sulphur dioxide
lithium bromide
R-12
Answer: Option
Explanation:
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9.
In a black body, all radiations are rejected.
True
False
Answer: Option
Explanation:
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10.
Most air cooled condensers are designed to operate with a temperature difference of
5°C
8°C
14°C
22°C
Answer: Option
Explanation:
No answer description is available. Let's discuss.