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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-2 section-1

Each section contains 100 MCQs on Refrigeration and Air Conditioning .
11
During cooling and dehumidification, dry bulb temperature
Discuss
Answer & Solution
Answer: Option C
Solution:
During the heating and dehumidification process dry bulb temperature of the air increases while its dew point and wet bulb temperature reduces.
12
In a domestic vapour compression refrigerator, the refrigerant commonly used is
Discuss
Answer & Solution
Answer: Option C
Solution:
In a domestic vapour compression refrigerator, the refrigerant commonly used is R-12.
13
In refrigerators, the temperature difference between the evaporating refrigerant and the medium being cooled should be
Discuss
Answer & Solution
Answer: Option B
Solution:
In refrigerators, the temperature difference between the evaporating refrigerant and the medium being cooled should be As low as possible (3 to 11°C)
14
The minimum temperature to which water can be cooled in a cooling tower is
Discuss
Answer & Solution
Answer: Option B
Solution:
The minimum temperature to which water can be cooled in a cooling tower is Wet bulb temperature of air
15
Air refrigeration cycle is used in
Discuss
Answer & Solution
Answer: Option D
Solution:
The processes are used for scientific, industrial and commercial purposes. Many gases can be put into a liquid state at normal atmospheric pressure by simple cooling; a few, such as carbon dioxide, require pressurization as well.
At ambient pressure the boiling point of liquefied helium is 4.22 K
16
The value of C.O.P. in vapour compression cycle is usually
Discuss
Answer & Solution
Answer: Option B
Solution:
The value of C.O.P. in vapour compression cycle is usually always more than unity.
17
The specific humidity during cooling and dehumidification
Discuss
Answer & Solution
Answer: Option C
Solution:
The process in which the moisture or water vapor or the humidity is removed from the air keeping its dry bulb (DB) temperature constant is called as the dehumidification process
The specific humidity during cooling and dehumidification Decreases
18
The suction pipe diameter of refrigerating unit compressor in comparison to delivery side is
Discuss
Answer & Solution
Answer: Option A
Solution:
The suction pipe diameter of refrigerating unit compressor in comparison to delivery side is Bigger
19
In a vapour compression refrigeration system, a throttle valve is used in place of an expander because
Discuss
Answer & Solution
Answer: Option C
Solution:
In a vapour compression refrigeration system, a throttle valve is used in place of an expander because The positive work in isentropic expansion of liquid is very small
20
In a refrigeration system, heat absorbed in comparison to heat rejected is
Discuss
Answer & Solution
Answer: Option B
Solution:
In a refrigeration system, heat absorbed in comparison to heat rejected is less