Mechanical Engineering - Heat Transfer, Refrigeration and Air Conditioning

6. 

The boiling point of ammonia is

A. -10.5°C
B. -30°C
C. -33.3°C
D. -77.7°C

Answer: Option C

Explanation:

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

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)

A.
B.
C.
D.

Answer: Option B

Explanation:

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

8. 

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: Option C

Explanation:

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

9. 

In a black body, all radiations are rejected.

A. True
B. False

Answer: Option B

Explanation:

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

10. 

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: Option C

Explanation:

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