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Refrigeration and Air Conditioning

Refrigeration and Air Conditioning
The boiling point of ________ is 10.5°C.

Ammonia
R-12
Sulphur dioxide
Carbon dioxide

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Refrigeration and Air Conditioning
A heat pump working on a reversed Carnot cycle has a C.O.P. of 5. It works as a refrigerator taking 1 kW of work input. The refrigerating effect will be

4 kW
2 kW
1 kW
3 kW

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Refrigeration and Air Conditioning
Critical temperature is the temperature above which

A gas will never liquefy
Water will never evaporate
A gas will immediately liquefy
Water will evaporate

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Refrigeration and Air Conditioning
The refrigerant used in small tonnage commercial machines (hermetically sealed units) is

R-12
Sulphur dioxide
Carbon dioxide
Ammonia

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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)

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

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

Evaporator
Condenser
Absorber
None of these

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