MCQs on Refrigeration and Air Conditioning
Solve Refrigeration and Air Conditioning Multiple-Choice Questions to prepare better for GATE. Learn more about Refrigeration and Air Conditioning and Refrigeration and Air Conditioning MCQs by checking notes, mock tests, and previous years’ question papers. Gauge the pattern of MCQs on Refrigeration and Air Conditioning by solving the ones that we have compiled below for your practice:
Refrigeration and Air Conditioning Multiple-Choice Questions
1. The temperature of the dry bulb ____________ during the process of heating and dehumidification.
a. Increases
b. Decreases
c. Remains Constant
d. Cannot be Determined
Answer: (a) Increases
2. A typical refrigeration cycle would operate between a +27°C condenser temperature and a -23°C evaporator temperature. Here, what would be the performance of the cycle’s Carnot coefficient?
a. 6
b. 5
c. 1.2
d. 0.2
Answer: (b) 5
3. Which of these increases during the process of humidification?
a. Specific humidity
b. Dry bulb temperature
c. Relative humidity
d. Wet-bulb temperature
Answer: (c) Relative humidity
4. What does a vapour absorption refrigerator use in the form of a refrigerant?
a. Aqua-ammonia
b. Freon
c. Ammonia
d. Water
Answer: (a) Aqua-ammonia
5. One ton of refrigeration in the S.J. unit is:
a. 840 kJ/min
b. 420 kJ/unit
c. 21 kJ/unit
d. 210 kJ/unit
Answer: (d) 210 kJ/unit
6. At a domestic refrigerator’s back, the bank of tubes is known as:
a. Evaporator tubes
b. Condenser tubes
c. Capillary tubes
d. Refrigerant cooling tubes
Answer: (b) Condenser tubes
7. The expansion device, in any refrigeration system, is connected between:
a. Receiver and Condenser
b. Compressor and Condenser
c. Compressor and Evaporator
d. Evaporator and Receiver
Answer: (d) Evaporator and Receiver
8. What do we call the ratio of the actual mass of water present in an available volume of moist air to the total amount of water vapour present in the very same amount of saturated air present in the same pressure and temperature?
a. Degree of saturation
b. Absolute humidity
c. Relative humidity
d. Humidity ratio
Answer: (c) Relative humidity
9. Which of these refrigerants is highly flammable and toxic?
a. R-12
b. Sulphur dioxide
c. Carbon dioxide
d. Ammonia
Answer: (d) Ammonia
10. During the process of sensible heating of air, the wet-bulb temperature would be:
a. Decreases
b. Remains Constant
c. Increases
d. None of the above
Answer: (c) Increases
11. What is the mixture of water vapour called when the maximum amount of water vapour has been diffused in the air?
a. Specific humidity
b. Saturated air
c. Moist air
d. Dry air
Answer: (b) Saturated air
12. In a vapour compression cycle, where do we find the lowest temperature?
a. Evaporator
b. Condenser
c. Expansion Valve
d. Compressor
Answer: (a) Evaporator
13. What is the pressure at a refrigerator’s inlet known as?
a. Back Pressure
b. Critical Pressure
c. Discharge Pressure
d. Suction Pressure
Answer: (d) Suction Pressure
14. The ideal thermal efficiency of a reversible engine is 30%. The coefficient of performance, when we use it as a type of refrigerating machine with every other condition unchanged, will be:
a. 4.33
b. 3.33
c. 2.33
d. 1.33
Answer: (c) 2.33
15. On the psychrometric chart, the marking of the alignment circle will be at:
a. 50% RH and 20°C DBT
b. 50% RH and 26°C DBT
c. 60% RH and 20°C DBT
d. 60% RH and 26°C DBT
Answer: (b) 50% RH and 26°C DBT
16. Before entering the expansion or the throttle valve, a refrigerant’s condition in any vapour compression system is:
a. Dry Vapour
b. Very Wet Vapour
c. High-Pressure Saturated Liquid
d. Moist Vapour
Answer: (c) High-Pressure Saturated Liquid
17. Which of these types of compressors are used in our domestic refrigerators?
a. Axial
b. Centrifugal
c. Piston Type Reciprocating
d. Miniature Sealed Unit
Answer: (c) Piston Type Reciprocating
18. Which of these is the refrigerant that has the highest critical pressure?
a. R-12
b. Ammonia
c. R-11
d. R-22
Answer: (b) Ammonia
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