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Refrigeration and Air Conditioning

Refrigeration and Air Conditioning
Short horizontal lines on pressure-enthalpy chart show

Constant temperature lines
Constant total heat lines
Constant entropy lines
Constant pressure lines

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

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Refrigeration and Air Conditioning
Which of the following refrigerants has lowest freezing point?

NH3
Freon-22
Freon-12
CO2

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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?

0.5
1.25
0.25
0.8

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Refrigeration and Air Conditioning
In vapour compression cycle, the condition of refrigerant is very wet vapour

After passing through the expansion or throttle valve
After passing through the condenser
Before entering the compressor
Before passing through the condenser

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

R-12
All of these
CO?
Ammonia

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MORE MCQ ON Refrigeration and Air Conditioning

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