Mechanical Engineering - Heat Transfer, Refrigeration and Air Conditioning

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:

No answer description available for this question. Let us discuss.

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:

No answer description available for this question. Let us discuss.

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:

No answer description available for this question. Let us discuss.

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:

No answer description available for this question. Let us discuss.

10. 

Defrosting of a refrigerator may be done by stopping the compressor for a short period.

A. Correct
B. Incorrect

Answer: Option A

Explanation:

No answer description available for this question. Let us discuss.