Mechanical Engineering - Heat Transfer, Refrigeration and Air Conditioning

21. 

The wet bulb temperature lines, on the psychrometric chart, are curved lines.

A. True
B. False

Answer: Option B

Explanation:

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22. 

The sensible heat factor during cooling and dehumidification process is given by (where h1 = Enthalpy of air entering the cooling coil, h2 = Enthalpy of air leaving the cooling coil, and hA = Enthalpy of air at the end of dehumidification process)

A.
B.
C.
D.

Answer: Option A

Explanation:

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23. 

Thermal diffusivity is a

A. function of temperature
B. physical property of a substance
C. dimensionless parameter
D. all of these

Answer: Option B

Explanation:

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24. 

The condition of refrigerant after leaving the compressor and before entering the condenser is superheated vapour.

A. Yes
B. No

Answer: Option A

Explanation:

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25. 

The total radiation from a black body per second per unit area is __________ fourth power of the absolute temperature. This statement is known as Stefan-Boltzmann law.

A. equal to
B. directly proportional to
C. inversely proportional to

Answer: Option B

Explanation:

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