Mechanical Engineering - Heat Transfer, Refrigeration and Air Conditioning

36. 

The capillary tube, as an expansion device, is used in

A. domestic refrigerators
B. water coolers
C. room air conditioners
D. all of these

Answer: Option D

Explanation:

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37. 

In aircraft, air refrigeration Cycle is used because of

A. low weight per tonne of refrigeration
B. high heat transfer rate
C. low temperature at high altitudes
D. higher coefficient of performance

Answer: Option A

Explanation:

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38. 

The material of pipe lines for a system using freon as a refrigerant should be

A. brass
B. copper
C. steel
D. aluminium

Answer: Option B

Explanation:

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39. 

The temperature of air recorded by a thermometer, when the moisture present in it begins to condense, is called wet bulb temperature.

A. Yes
B. No

Answer: Option B

Explanation:

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40. 

In a pressure enthalpy chart, the space to the left of the saturated liquid line represents

A. wet vapour region
B. superheated vapour region
C. sub-cooled liquid region
D. none of these

Answer: Option C

Explanation:

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