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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-7 section-2

Each section contains 100 MCQs on Refrigeration and Air Conditioning .
61
Moisture should be removed from refrigerants to avoid
Discuss
Answer & Solution
Answer: Option D
Solution:
Moisture should be removed from refrigerants to avoid
- Freezing at the expansion valve
- Restriction to refrigerant flow
- Corrosion of steel plates
62
Air refrigerator works on
Discuss
Answer & Solution
Answer: Option C
Solution:
Air cycle refrigeration works on Reversed Carnot cycle and Bell Coleman cycle.
Air is compressed and then heat removed, this air is then expanded to a lower temperature than before it was compressed.
Work is taken out of the air by an expansion turbine, which removes energy as the blades are driven round by the expanding air.
63
The bypass factor of a cooling coil decreases with
Discuss
Answer & Solution
Answer: Option A
Solution:
The bypass factor is a function of the airflow, number of rows, surface temperature, number of fins per inch, height of fins and many other construction attributes of coils.
The bypass factor of a cooling coil decreases with decrease in fin spacing and increase in number of rows.
64
The formation of frost on cooling coils in a refrigerator
Discuss
Answer & Solution
Answer: Option C
Solution:
The formation of frost on cooling coils in a refrigerator increases power consumption
65
The boiling point of ammonia is
Discuss
Answer & Solution
Answer: Option C
Solution:
The boiling point of ammonia is -33.3°C
66
Moisture in Freon refrigeration system causes
Discuss
Answer & Solution
Answer: Option C
Solution:
Moisture in Freon refrigeration system causes Freezing automatic regulating valve
67
A refrigerating system operating on reversed Brayton refrigeration cycle is used for maintaining 250 K. If the temperature at the end of constant pressure cooling is 300 K and rise in the temperature of air in the refrigerator is 50 K, then the net work of compression will be (assume air as working substance with Cp = 1 kJ/kg)
Discuss
Answer & Solution
Answer: Option B
Solution:
A refrigerating system operating on reversed Brayton refrigeration cycle is used for maintaining 250 K. If the temperature at the end of constant pressure cooling is 300 K and rise in the temperature of air in the refrigerator is 50 K, then the net work of compression will be 50 kJ/kg
68
The relative humidity is defined as
Discuss
Answer & Solution
Answer: Option D
Solution:
The relative humidity is defined as the ratio of actual mass of water vapour in a given volume of moist air to the mass of water vapour in the same volume of saturated air at the same temperature and pressure.
69
The wet bulb temperature during sensible cooling of air
Discuss
Answer & Solution
Answer: Option C
Solution:
The wet bulb temperature during sensible cooling of air Decreases
70
The dry bulb temperature during sensible heating of air
Discuss
Answer & Solution
Answer: Option B
Solution:
The dry bulb temperature during sensible heating of air Increases