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Refrigeration and Air Conditioning

Refrigeration and Air Conditioning
Carbon dioxide is

Colourless
All of the listed here
Odourless
Non-flammable

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Refrigeration and Air Conditioning
Pick up the correct statement about giving up of heat from one medium to other in ammonia absorption system

Ammonia vapours to weak solution
Weak solution to strong solution
Strong solution to weak solution
Strong solution to ammonia vapour

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Refrigeration and Air Conditioning
Ammonia absorption refrigeration cycle requires

Very little work input
Maximum work input
Nearly same work input as for vapour compression cycle
Zero work input

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Refrigeration and Air Conditioning
The freezing point of R-12 is

-107.7°C
-95.2°C
-86.6°C
-135.8°C

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Refrigeration and Air Conditioning
Most thermostatic expansion valves are set for a superheat of

10°C
20°C
15°C
5°C

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Refrigeration and Air Conditioning
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

5.12
1
1.25
2.15

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