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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-3 section-3

Each section contains 100 MCQs on Refrigeration and Air Conditioning .
21
It is desired to condition the outside air from 70% relative humidity and 45°C dry bulb temperature to 50% relative humidity and 25°C dry bulb temperature (room condition). The practical arrangement will be
Discuss
Answer & Solution
Answer: Option C
Solution:
It is desired to condition the outside air from 70% relative humidity and 45°C dry bulb temperature to 50% relative humidity and 25°C dry bulb temperature (room condition). The practical arrangement will be Cooling and dehumidification.
22
In a bootstrap air evaporative cooling system, the evaporator is provided
Discuss
Answer & Solution
Answer: Option D
Solution:
In a bootstrap air evaporative cooling system, the evaporator is provided Between the second heat exchanger and the cooling turbine
23
The refrigerant for a refrigerator should have
Discuss
Answer & Solution
Answer: Option C
Solution:
The specific heat of liquid should be as small as possible and of vapour should be as high as possible to give less superheating of vapour. High latent heat of vaporization to get more refrigeration effect. Large conductivity to reduce size of condenser and evaporator. Low specific volume of vapour.
24
The difference between dry bulb temperature and wet bulb temperature, is called
Discuss
Answer & Solution
Answer: Option B
Solution:
The wet bulb depression is the difference between the dry-bulb temperature(Air temperature) and the wet-bulb temperature.
25
The difference between dry bulb temperature and dew point temperature, is called
Discuss
Answer & Solution
Answer: Option C
Solution:
The difference between dry bulb temperature and dew point temperature, is called Dew point depression
26
The C.O.P. of a refrigeration cycle with lowering of condenser temperature, keeping the evaporator temperature constant, will
Discuss
Answer & Solution
Answer: Option A
Solution:
The C.O.P. of a refrigeration cycle with lowering of condenser temperature, keeping the evaporator temperature constant, will Increase
27
One of the purposes of sub cooling the liquid refrigerant is to
Discuss
Answer & Solution
Answer: Option D
Solution:
One of the purposes of sub cooling the liquid refrigerant is to Ensure that only liquid and not the vapour enters the expansion (throttling) valve
28
During adiabatic saturation process on unsaturated air __________ remains constant.
Discuss
Answer & Solution
Answer: Option D
Solution:
During adiabatic saturation process on unsaturated air wet Bulb temperature remains constant.
29
During dehumidification process, _________ remains constant.
Discuss
Answer & Solution
Answer: Option C
Solution:
During dehumidification process Dry Bulb Temperature remains constant.
30
The condition of refrigerant after passing through the condenser in a vapour compression system is
Discuss
Answer & Solution
Answer: Option A
Solution:
The condition of refrigerant after passing through the condenser in a vapour compression system is Saturated liquid