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Refrigeration and Air Conditioning

Refrigeration and Air Conditioning
The power per tonne of refrigeration is

3.5/C.O.P.
O.P/3.5
None of these
3.5 × C.O.P.

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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

3.72 kW
1.86 kW
18.6 kW
7.44 kW

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Refrigeration and Air Conditioning
The coefficient of performance (C.O.P.) of a refrigerator working as a heat pump is given by

O.P.)R + 1
(
O.P.)P = (
O.P.)R + 2
(
(
O.P)P = (
O.P)P = (
O.P)R - 1
O.P.)P = (
(
O.P)R

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Refrigeration and Air Conditioning
The capillary tube, as an expansion device, is used in

All of these
Room air conditioners
Water coolers
Domestic refrigerators

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Refrigeration and Air Conditioning
Superheating in a refrigeration cycle

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

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Refrigeration and Air Conditioning
The coefficient of performance of Heat Pump is always ___ one.

None of the listed here
Equal to
Less than
Greater than

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