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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
Carbon dioxide
Sulphur dioxide
Lithium bromide

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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

4 kW
3 kW
2 kW
1 kW

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Refrigeration and Air Conditioning
Moisture in Freon refrigeration system causes

Freezing automatic regulating valve
Corrosion of whole system
High power consumption
Ineffective refrigeration

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Refrigeration and Air Conditioning
The wet bulb temperature during sensible heating of air

Remains constant
Decreases
None of these
Increases

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Refrigeration and Air Conditioning
A refrigerating system operating on reversed Brayton refrigeration cycle is used for maintaining 250 K. If the temperature at the end of constant pressure cooling is 300 K and rise in the temperature of air in the refrigerator is 50 K, then the net work of compression will be (assume air as working substance with Cp = 1 kJ/kg)

100 kJ/kg
25 kJ/kg
125 kJ/kg
50 kJ/kg

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Refrigeration and Air Conditioning
In a domestic vapour compression refrigerator, the refrigerant commonly used is

Ammonia
All of these
R-12
CO?

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MORE MCQ ON Refrigeration and Air Conditioning

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