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:
|
| 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:
|
| 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:
|
| 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:
|
| 10. |
Defrosting of a refrigerator may be done by stopping the compressor for a short period. |
Answer: Option A
Explanation:
|
