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Refrigeration and Air Conditioning

Refrigeration and Air Conditioning
In S.J. unit, one ton of refrigeration is equal to

840 kJ/ min
210 kJ/ min
21 kJ/ min
420 kJ/ min

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Refrigeration and Air Conditioning
The wet bulb temperature during sensible cooling of air

Decreases
Remains constant
None of these
Increases

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

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

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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)

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

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Refrigeration and Air Conditioning
The leakage in a refrigeration system using Freon is detected by

Soap and water
All of these
Halide torch
Sulphur sticks

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Refrigeration and Air Conditioning
Air refrigeration cycle is used in

Domestic refrigerators
Air conditioning
Gas liquefaction
Commercial refrigerators

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