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Refrigeration and Air Conditioning

Refrigeration and Air Conditioning
Under cooling in a refrigeration cycle

Other factors decide C.O.P
Decreases C.O.P
O.P remains unaltered
Increases C.O.P

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Refrigeration and Air Conditioning
A refrigeration cycle operates between condenser temperature of + 27°C and evaporator temperature of -23°C. The Carnot coefficient of performance of cycle will be

5
6
0.2
1.2

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Refrigeration and Air Conditioning
A standard ice point temperature corresponds to the temperature of

Mixture of ice and water under equilibrium conditions
Solid and dry ice
Ice at 4°C
Water at 0°C

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Refrigeration and Air Conditioning
The emissivity of a polished silver body is ____ as compared to black body.

Low
Very low
High
Same

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

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

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Refrigeration and Air Conditioning
The colour of the flame of halide torch, in case of leakage of Freon refrigerant, will change to

Yellow
Orange
Red
Bright green

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