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Refrigeration and Air Conditioning

Refrigeration and Air Conditioning
Efficiency of a Carnot engine is given as 80%. If the cycle direction be reversed, what will be the value of C.O.P. of reversed Carnot Cycle?

1.25
0.8
0.25
0.5

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Refrigeration and Air Conditioning
In a refrigeration system, the expansion device is connected between the

Evaporator and compressor
Receiver and evaporator
Condenser and receiver
Compressor and condenser

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

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Refrigeration and Air Conditioning
In a pressure enthalpy chart, the space to the left of the saturated liquid line represents

None of the listed here
Superheated vapour region
Sub-cooled liquid region
Wet vapour region

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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
1.2
0.2

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Refrigeration and Air Conditioning
The freezing point of R-12 is

-135.8°C
-95.2°C
-107.7°C
-86.6°C

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