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Refrigeration and Air Conditioning

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
1.2
6
0.2

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Refrigeration and Air Conditioning
For obtaining high COP, the pressure range of compressor should be

High
Any value
Low
Optimum

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Refrigeration and Air Conditioning
The alignment circle is marked on the psychrometric chart at

26°C DBT and 60% RH
26°C DBT and 50% RH
20°C DBT and 60% RH
20°C DBT and 50% RH

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Refrigeration and Air Conditioning
The human body feels comfortable when the heat stored in the body is

None of these
Positive
Negative
Zero

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Refrigeration and Air Conditioning
In aqua ammonia absorption refrigeration system, incomplete rectification leads to accumulation of water in

Absorber
Evaporator
None of these
Condenser

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Refrigeration and Air Conditioning
The sensible heat factor during the heating and humidification process is given by (where h₁ = Enthalpy of air entering the heating coil, h₂ = Enthalpy of air leaving the heating coil, and hA = Enthalpy of air at the end of humidification process)

(h1 - h2)/ (hA - h2)
(hA - h1)/ (h2 - h1)
(hA - h2)/ (h1 - h2)
(h2 - hA)/ (h1 - h2)

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