Mechanical Engineering - Heat Transfer, Refrigeration and Air Conditioning

11. 

In a domestic refrigerator, a capillary tube controls the flow of refrigerant from the

A. expansion valve to the evaporator
B. evaporator to the thermostat
C. condenser to the expansion valve
D. condenser to the evaporator

Answer: Option D

Explanation:

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12. 

The absolute humidity is the mass of water vapour present in 1 m3 of dry air.

A. Agree
B. Disagree

Answer: Option A

Explanation:

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13. 

In a vapour absorption refrigeration system, the compressor of the vapour compression system is replaced by

A. liquid pump
B. generator
C. absorber and generator
D. absorber, generator and liquid pump

Answer: Option D

Explanation:

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14. 

The refrigerant used in small-tonnage commercial machines (hermetically sealed units) is

A. ammonia
B. carbon dioxide
C. sulphur dioxide
D. R-12

Answer: Option C

Explanation:

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15. 

In a lithium bromide absorption refrigeration system

A. lithium bromide is used as a refrigerant and water as an absorbent
B. water is used as a refrigerant and lithium bromide as an absorbent
C. ammonia is used as a refrigerant and lithium bromide as an absorbent
D. none of the above

Answer: Option B

Explanation:

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