Mechanical Engineering - Heat Transfer, Refrigeration and Air Conditioning

41. 

Conduction is the process of heat transfer from one particle of the body to another by the actual motion of the heated particles.

A. True
B. False

Answer: Option B

Explanation:

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42. 

Moisture should be removed from refrigerants to avoid

A. freezing at the expansion valve
B. restriction to refrigerant flow
C. corrosion of steel plates
D. all of these

Answer: Option D

Explanation:

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43. 

Which of the following statement is wrong?

A. The value of C.O.P. is always greater than one.
B. In a vapour compression system, the condition of refrigerant before entering the compressor is dry saturated vapour.
C. The space between the saturated liquid line and saturated vapour line, in a pressure enthalpy chart, is wet vapour region.
D. none of the above

Answer: Option D

Explanation:

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44. 

During humidification process, dry bulb temperature

A. remains constant
B. increases
C. decreases

Answer: Option A

Explanation:

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45. 

Fourier's law of heat conduction gives the heat flow for

A. irregular surfaces
B. non-uniform temperature surfaces
C. one dimensional cases only
D. two dimensional cases only

Answer: Option C

Explanation:

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