Mechanical Engineering - Heat Transfer, Refrigeration and Air Conditioning
Exercise :: Heat Transfer, Refrigeration and Air Conditioning - Section 1
6. |
The humidity ratio or specific humidity is the mass of water vapour present in |
A. |
1 m3 of wet air | B. |
1 m3 of dry air | C. |
1 kg of wet air | D. |
1 kg of dry air |
Answer: Option D
Explanation:
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7. |
The formation of frost on cooling coils in a refrigerator |
A. |
increases heat transfer | B. |
improves C.O.P. of the system | C. |
increases power consumption | D. |
reduces power consumption |
Answer: Option C
Explanation:
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8. |
The by-pass factor for a cooling coil |
A. |
increases with increase in velocity of air passing through it | B. |
decreases with increase in velocity of air passing through it | C. |
remains unchanged with increase in velocity of air passing through it | D. |
may increase or decrease with increase in velocity of air passing through it depending upon the condition of air entering |
Answer: Option A
Explanation:
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9. |
The difference between dry bulb temperature and wet bulb temperature, is called |
A. |
dry bulb depression | B. |
wet bulb depression | C. |
dew point depression | D. |
degree of saturation |
Answer: Option B
Explanation:
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10. |
Defrosting of a refrigerator may be done by stopping the compressor for a short period. |
Answer: Option A
Explanation:
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