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Refrigeration And Air Conditioning MCQ Questions & Answers | Mechanical Engineering

Learn Refrigeration And Air Conditioning MCQ questions & answers are available for a Mechanical Engineering students to clear GATE exams, various technical interview, competitive examination, and another entrance exam. Refrigeration And Air Conditioning MCQ question is the important chapter for a Mechanical Engineering and GATE students. Page-5 section-2

Each section contains 100 MCQs on Refrigeration and Air Conditioning .
41
Superheating in a refrigeration cycle
Discuss
Answer & Solution
Answer: Option B
Solution:
Superheating in a refrigeration cycle decreases C.O.P.
42
Hydrogen is used in Electrolux refrigeration system so as to _________ the rate of evaporation of the liquid ammonia passing through the evaporator.
Discuss
Answer & Solution
Answer: Option C
Solution:
Hydrogen is used in Electrolux refrigeration system so as to increase the rate of evaporation of the liquid ammonia passing through the evaporator.
43
The dehumidification process, on the psychrometric chart, is shown by
Discuss
Answer & Solution
Answer: Option B
Solution:

The dehumidification process, on the psychrometric chart, is shown by Vertical line
44
The process, generally used in winter air-conditioning to warm and humidity the air, is called
Discuss
Answer & Solution
Answer: Option C
Solution:
The process, generally used in winter air-conditioning to warm and humidity the air, is called Heating and humidification
45
The process, generally used in summer air conditioning to cool and dehumidify the air, is called
Discuss
Answer & Solution
Answer: Option D
Solution:
The process, generally used in summer air conditioning to cool and dehumidify the air, is called Cooling and dehumidification
46
The temperature of air recorded by a thermometer, when it is not affected by the moisture present in the air, is called
Discuss
Answer & Solution
Answer: Option B
Solution:

The temperature of air recorded by a thermometer, when it is not affected by the moisture present in the air, is called Dry bulb temperature
47
The temperature of air recorded by a thermometer, when its bulb is surrounded by a wet cloth exposed to the air, is called
Discuss
Answer & Solution
Answer: Option A
Solution:
The temperature of air recorded by a thermometer, when its bulb is surrounded by a wet cloth exposed to the air, is called Wet bulb temperature
48
The thermostatic expansion valve operates on the changes in the
Discuss
Answer & Solution
Answer: Option A
Solution:
The thermostatic expansion valve operates on the changes in the Degree of superheat at exit from the evaporator
49
A condenser of refrigeration system rejects heat at the rate of 120 kW, while its compressor consumes a power of 30 kW. The coefficient of performance of the system will be
Discuss
Answer & Solution
Answer: Option D
Solution:
The coefficient of performance or C.O.P. (sometimes CP or CoP) of a heat pump, refrigerator or air conditioning system is a ratio of useful heating or cooling provided to work required.
$${\text{C}}{\text{.O}}{\text{.P}}{\text{.}} = \frac{{120\,{\text{kw}}}}{{30\,{\text{kw}}}} = 4\,{\text{kw}}$$
50
A standard ice point temperature corresponds to the temperature of
Discuss
Answer & Solution
Answer: Option D
Solution:
A standard ice point temperature corresponds to the temperature of Mixture of ice and water under equilibrium conditions