Mechanical Engineering - Heat Transfer, Refrigeration and Air Conditioning

41. 

In order to cool and dehumidify a stream of moist air, it must be passed over the coil at a temperature

A. which lies between the dry bulb and wet bulb temperatures of the incoming stream
B. which lies between the wet bulb and dew point temperatures of the incoming stream
C. which is lower than the dew point temperature of the incoming stream
D. of adiabatic saturation of incoming stream

Answer: Option C

Explanation:

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42. 

The coefficient of performance of vapour compression refrigeration system is quite __________ as compared to air refrigeration system.

A. low
B. high

Answer: Option B

Explanation:

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43. 

In order to collect liquid refrigerant and to prevent it from going to a __________ , a device known as accumulator is used at the suction of compressor.

A. compressor
B. condenser
C. expansion valve
D. evaporator

Answer: Option A

Explanation:

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44. 

Which of the following refrigerant has the lowest boiling point?

A. Ammonia
B. Carbon dioxide
C. Sulphur dioxide
D. R-12

Answer: Option B

Explanation:

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45. 

During sensible cooling of air, the relative humidity increases.

A. Yes
B. No

Answer: Option A

Explanation:

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