Mechanical Engineering - Heat Transfer, Refrigeration and Air Conditioning

46. 

In actual air-conditioning applications for R-12 and R-22, and operating at a condenser temperature of 40° C and an evaporator temperature of 5° C, the heat rejection factor is about

A. 1
B. 1.25
C. 2.15
D. 5.12

Answer: Option B

Explanation:

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47. 

The undesireable property of a refrigerant is

A. non-toxic
B. non-flammable
C. non-explosive
D. high boiling point

Answer: Option D

Explanation:

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48. 

The dry bulb temperature during sensible heating of air

A. remains constant
B. increases
C. decreases

Answer: Option B

Explanation:

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49. 

Radiation is the process of heat transfer in which heat flows from a __________ , in a straight line, without affecting the intervening medium.

A. cold body to hot body
B. hot body to cold body
C. smaller body to larger body
D. larger body to smaller body

Answer: Option B

Explanation:

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50. 

The heating of air, without any change in its specific humidity, is known as sensible heating.

A. True
B. False

Answer: Option A

Explanation:

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