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Refrigeration and Air Conditioning

Refrigeration and Air Conditioning
The operating pressure for refrigerating units using R-12 as a refrigerant is

15 bar
8 bar
2 bar
30 bar

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Refrigeration and Air Conditioning
The relative humidity lines on a psychrometric chart are

Vertical and uniformly spaced
Horizontal and non-uniformly spaced
Curved lines
Horizontal and uniformly spaced

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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)

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

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Refrigeration and Air Conditioning
The optimum effective temperature for human comfort is

Not dependent on season
Lower in winter than in summer
Higher in winter than in summer
Same in winter and summer

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Refrigeration and Air Conditioning
In a refrigeration system, the expansion device is connected between the

Condenser and receiver
Compressor and condenser
Evaporator and compressor
Receiver and evaporator

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Refrigeration and Air Conditioning
Air refrigeration operates on

Rankine’s cycle
Reversed Carnot cycle
Brayton cycle
Carnot cycle

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MORE MCQ ON Refrigeration and Air Conditioning

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