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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

Lithium bromide
R-12
Carbon dioxide
Sulphur dioxide

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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

0.376
0.4
0.67
0.6

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Refrigeration and Air Conditioning
While designing the refrigeration system of an aircraft, the prime consideration is that the

Power per TR is low
System has high C.O.P.
Mass of the refrigeration equipment is low
Mass of refrigerant circulated in the system is low

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Refrigeration and Air Conditioning
Freon group of refrigerants are

Toxic
Inflammable
Nontoxic and non-inflammable
Non-inflammable and toxic

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Refrigeration and Air Conditioning
The temperature of ammonia after compression in a vapour compression system is

50 to 70°C
None of these
20 to 50°C
70 to 110°C

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Refrigeration and Air Conditioning
A certain refrigerating system has a normal operating suction pressure of 10 kg/cm gauge and condensing pressure of about 67 kg/cm. The refrigerant used is

Carbon dioxide
Brine
Freon
Ammonia

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