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Refrigeration and Air Conditioning

Refrigeration and Air Conditioning
The refrigerant used for absorption refrigerators working on heat from solar collectors is a mixture of water and

R-12
Lithium bromide
Carbon dioxide
Sulphur dioxide

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Refrigeration and Air Conditioning
Which of the following cycles uses air as the refrigerant?

Carnot
Stirling
Ericson
Bell Coleman

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Refrigeration and Air Conditioning
The air cooling system mostly used in transport type aircrafts is

Bootstrap air cooling system
Simple air cooling system
All of the listed here
Simple evaporative air cooling system

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Refrigeration and Air Conditioning
R-12 is generally preferred over R-22 in deep freezers since

It has low operating pressures
All of these
It gives higher coefficient of performance
It is miscible with oil over large range of temperatures

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Refrigeration and Air Conditioning
Most of the domestic refrigerators work on the following refrigeration system

Vapour compression
Vapour absorption
Electrolux refrigerator
Carnot cycle

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Refrigeration and Air Conditioning
The operating temperature of a cold storage is -2°C. The heat leakage from the surrounding is 30 kW for the ambient temperature of 40°C. The actual C.O.P. of refrigeration plant used is one fourth that of ideal plant working between the same temperatures. The power required to drive the plant is

18.6 kW
7.44 kW
3.72 kW
1.86 kW

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