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Refrigeration and Air Conditioning

Refrigeration and Air Conditioning
In actual air-conditioning applications for R-12 and R-22, and operating at a condenser temperature of 40° C and an evaporator temperature of 5° C, the heat rejection factor is about

1.25
5.12
1
2.15

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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

3 kW
2 kW
1 kW
4 kW

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

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

Negative
Zero
None of these
Positive

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Refrigeration and Air Conditioning
The material of pipe lines for a system using Freon as a refrigerant should be

Brass
Aluminium
Copper
Steel

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Refrigeration and Air Conditioning
The bank of tubes at the back of domestic refrigerator is

Refrigerant cooling tubes
Capillary tubes
Condenser tubes
Evaporator tubes

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MORE MCQ ON Refrigeration and Air Conditioning

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