MCQ On Difference Between Air Conditioning And Refrigeration

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MCQ on Difference Between Air Conditioning And Refrigeration are covered in this article with answers and detailed explanation. Air conditioning and refrigeration are mainly used for the same purpose that is cooling but the applications are a little different. The parts of air conditioning and refrigeration are slightly different.

Ques. For obtaining high COP, the pressure range of the compressor should be.

Low
High
Optimum
None of the above

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Ans. a. Low

Explanation: For obtaining high COP, the pressure range of the compressor should be low.

Ques. In a refrigeration system, the expansion device is connected between the –

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

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Ans. c. Receiver and evaporator

Explanation: In a refrigeration system, the expansion device is connected between the receiver and evaporator

Ques. A reversible engine has an ideal thermal efficiency of 30%. When it is used as a refrigerating machine with all other conditions unchanged, the coefficient of performance will be –

2.33
3.33
4.33
6.33

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Ans. a. 2.33

Explanation: A reversible engine has an ideal thermal efficiency of 30%. When it is used as a refrigerating machine with all other conditions unchanged, the coefficient of performance will be 2.33

Ques. The condition of refrigerant after passing through the condenser in a vapour compression system is –

Wet vapour
Saturated liquid
Superheated vapour
Dry saturated vapour

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Ans. Saturated Liquid

Explanation: The condition of refrigerant after passing through the condenser in a vapour compression system is saturated Liquid

Ques. 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
1.25
2.15
5.12

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Ans. b. 1.25

Explanation: Heat rejection factor = (Heat rejected/Heat absorbed).

Here, COP = 7.942.

Implies, Q(rejected) = 1.12*Q (absorbed).

Hence, HRF = 1.12.

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Ques. In a refrigeration cycle, the flow of refrigerant is controlled by –

Expansion valve
Compressor
Evaporator
Condenser

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Ans. a. Expansion Valve

Explanation: The flow of refrigerant is controlled by the expansion valve.

Ques. Rating of a domestic refrigerator is of the order of –

10 tons
0.1 ton
40 tons
5 tons

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Ans. b. 0.1

Explanation: The rating of a domestic refrigerator is 0.1

Ques. For air conditioning in the operation theatre in a hospital, the percentage of outside air in the air supplied is

100
Zero
50
20

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Ans. 100

Explanation: The percentage of outside air in the operation theatre in a hospital is required is 100.

Ques. During sensible cooling of air ________ decreases

Relative humidity
Wet bulb temperature
Specific humidity
Dry bulb temperature

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Ans. Dry bulb temperature

Explanation: During sensible cooling of air dry bulb temperature decreases.

Ques. The process, generally used in winter air-conditioning to warm and humidify the air, is called

Humidification
Dehumidification
Heating and humidification
Cooling and dehumidification

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Ans. Heating and humidification

Explanation: The process, generally used in winter air-conditioning to warm and humidify the air, is called heating and humidification.

Ques. In aircraft, the air refrigeration cycle is used because of (1 Marks)

High heat transfer rate
Low weight per tonne of refrigeration
Higher coefficient of performance
Low temperature at high altitudes

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Ans. Low weight per tonne of refrigeration

Explanation: The air refrigeration cycle n aircraft is used because of the low weight per tonne of refrigeration.

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