Mechanical Engineering - Heat Transfer, Refrigeration and Air Conditioning

46. 

The thermostatic expansion valve operates on the changes in the

A. degree of superheat at exit from the evaporator
B. temperature of the evaporator
C. pressure in the evaporator
D. none of the above

Answer: Option A

Explanation:

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47. 

In a vapour compression system, the condition of refrigerant before entering the expansion or throttle valve is

A. high pressure saturated liquid
B. wet vapour
C. very wet vapour
D. dry vapour

Answer: Option A

Explanation:

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48. 

The freezing point of R-12 is

A. -86.6°C
B. -95.2°C
C. -107.7°C
D. -135.8°C

Answer: Option D

Explanation:

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49. 

The refrigerant supplied to a compressor must be

A. superheated vapour refrigerant
B. dry saturated liquid refrigerant
C. a mixture of liquid and vapour refrigerant
D. none of these

Answer: Option A

Explanation:

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50. 

The unit of thermal diffusivity is

A. m/hK
B. m/h
C. m2/h
D. m2/hK

Answer: Option C

Explanation:

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