Mechanical Engineering - Heat Transfer, Refrigeration and Air Conditioning

11. 

The final relative humidity of the air during cooling and dehumidification is generally __________ than that of entering air.

A. lower
B. higher

Answer: Option B

Explanation:

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12. 

The emissivity of a polished silver body is __________ as compared to black body.

A. same
B. low
C. very low
D. high

Answer: Option C

Explanation:

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13. 

In a pressure enthalpy chart, the space between the saturated liquid line and saturated vapour line, represents sub-cooled liquid region.

A. True
B. False

Answer: Option B

Explanation:

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14. 

R-11 has the highest critical point temperature.

A. Correct
B. Incorrect

Answer: Option A

Explanation:

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15. 

The ratio of heat extracted in the refrigerator to the workdone on the refrigerant is called

A. coefficient of performance of refrigeration
B. coefficient of performance of heat pump
C. relative coefficient of performance
D. refrigerating efficiency

Answer: Option A

Explanation:

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