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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

Sulphur dioxide
Lithium bromide
R-12
Carbon dioxide

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Refrigeration and Air Conditioning
In vapour compression cycle the condition off refrigerant is dry saturated vapour

Before entering the compressor
After passing through the condenser
After passing through the expansion or throttle valve
Before passing through the condenser

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Refrigeration and Air Conditioning
A heat pump working on a reversed Carnot cycle has a C.O.P. of 5. It works as a refrigerator taking 1 kW of work input. The refrigerating effect will be

1 kW
2 kW
4 kW
3 kW

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Refrigeration and Air Conditioning
The atmospheric air at dry bulb temperature of 15°C enters a heating coil maintained at 40°C. The air leaves the heating coil at 25°C. The bypass factor of the heating coil is

0.67
0.376
0.6
0.4

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Refrigeration and Air Conditioning
The heat rejection factor (HRF) is given by

1 - (1/C.O.P)
1 + C.O.P
1 - C.O.P.
1 + (1/C.O.P)

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Refrigeration and Air Conditioning
The condensing pressure due to the presence of non-condensable gases, as compared to that actually required for condensing temperatures without non-condensable gases,

Will be higher
Will remain unaffected
May be higher or lower depending upon the nature of non-condensable gases
Will be lower

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