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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-6 section-2

Each section contains 100 MCQs on Refrigeration and Air Conditioning .
51
The leakage in a refrigeration system using ammonia is detected by
Discuss
Answer & Solution
Answer: Option B
Solution:
The leakage in a refrigeration system using ammonia is detected by Sulphur sticks
52
The lower horizontal line of the refrigeration cycle plotted on pressure-enthalpy diagram represents
Discuss
Answer & Solution
Answer: Option B
Solution:
The lower horizontal line of the refrigeration cycle plotted on pressure-enthalpy diagram represents Evaporation of the refrigerant liquid
53
Which of the following refrigerant is highly toxic and flammable?
Discuss
Answer & Solution
Answer: Option A
Solution:
Ammonia is highly toxic and flammable.
54
The wet bulb depression indicates _________ humidity of the air.
Discuss
Answer & Solution
Answer: Option B
Solution:
The wet bulb depression indicates relative humidity of the air.
55
In case of sensible cooling of air, the coil efficiency is given by
Discuss
Answer & Solution
Answer: Option B
Solution:
In case of sensible cooling of air, the coil efficiency is given by 1 - B.P.F.
56
The specific humidity during dehumidification process
Discuss
Answer & Solution
Answer: Option C
Solution:
The specific humidity during dehumidification process Decreases
57
The specific humidity during humidification process
Discuss
Answer & Solution
Answer: Option B
Solution:
The specific humidity during humidification process Increases
58
The ratio of heat extracted in the refrigerator to the work-done on the refrigerant is called
Discuss
Answer & Solution
Answer: Option A
Solution:
The efficiency of a refrigerator or heat pump is given by a parameter called the coefficient of performance (C.O.P.).
The C.O.P. of a refrigerator is given by the following equation:
$$\eqalign{ & {\text{C}}{\text{.O}}{\text{.P}}{\text{.}} = \frac{{{\text{Desired Output}}}}{{{\text{Required Input}}}} \cr & = \frac{{{\text{Cooling Effect}}}}{{{\text{Work Input}}}} \cr & = \frac{{{\text{QL}}}}{{\text{W}}} \cr} $$
59
The material of pipe lines for a system using Freon as a refrigerant should be
Discuss
Answer & Solution
Answer: Option B
Solution:
The material of pipe lines for a system using Freon as a refrigerant should be copper
60
The vapour pressure of refrigerant should be
Discuss
Answer & Solution
Answer: Option B
Solution:
The vapour pressure of refrigerant should be Higher than atmospheric pressure