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Refrigeration and Air Conditioning

Refrigeration and Air Conditioning
The dry bulb temperature during sensible heating of air

Increases
Remains constant
None of these
Decreases

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

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Refrigeration and Air Conditioning
The C.O.P. of a Carnot refrigerator in winter will be _________ as compared to C.O.P. in summer.

Lower
Same
Higher
None of these

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Refrigeration and Air Conditioning
A refrigerating system operating on reversed Brayton refrigeration cycle is used for maintaining 250 K. If the temperature at the end of constant pressure cooling is 300 K and rise in the temperature of air in the refrigerator is 50 K, then the net work of compression will be (assume air as working substance with Cp = 1 kJ/kg)

50 kJ/kg
100 kJ/kg
25 kJ/kg
125 kJ/kg

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Refrigeration and Air Conditioning
The difference between dry bulb temperature and wet bulb temperature, is called

Wet bulb depression
Dry bulb depression
Dew point depression
Degree of saturation

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Refrigeration and Air Conditioning
The ratio of heat extracted in the refrigerator to the work-done on the refrigerant is called

Refrigerating efficiency
Coefficient of performance of heat pump
Coefficient of performance of refrigeration
Relative coefficient of performance

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