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Mechanical Engineering
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Heat Transfer, Refrigeration and Air Conditioning
Comments
Question
During heating and humidification, the final relative humidity of air
Options
A. is higher than that of the entering air
B. is lower than that of the entering air
C. can be lower or higher than that of the entering air
D. none of the above
Correct Answer
can be lower or higher than that of the entering air
Heat Transfer, Refrigeration and Air Conditioning problems
Search Results
1. A human body feels comfortable when the heat produced by the metabolism of human body is equal to the
Options
A. heat dissipated to the surroundings
B. heat stored in the human body
C. sum of (a) and (b)
D. difference of (a) and (b)
Show Answer
Scratch Pad
Discuss
Correct Answer: sum of (a) and (b)
2. The specific humidity during cooling and dehumidification
Options
A. remains constant
B. increases
C. decreases
Show Answer
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Discuss
Correct Answer: decreases
3. During sensible cooling,
Options
A. relative humidity remains constant
B. wet bulb temperature increases
C. specific humidity increases
D. partial pressure of vapour remains constant
Show Answer
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Discuss
Correct Answer: partial pressure of vapour remains constant
4. The leakage in a refrigeration system using ammonia is detected by
Options
A. halide torch
B. sulphur sticks
C. soap and water
D. all of these
Show Answer
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Discuss
Correct Answer: sulphur sticks
5. In figure shown,
E
is a heat engine with efficiency of 0.4 and
R
is a refrigerator. It is given that
Q
2
+
Q
4
= 3
Q
1
. The C.O.P. of the refrigerator is
Options
A. 2.5
B. 3.0
C. 4.0
D. 5.0
Show Answer
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Discuss
Correct Answer: 5.0
6. The overall coefficient of heat transfer is used in problems of
Options
A. conduction
B. convection
C. radiation
D. conduction and convection
Show Answer
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Correct Answer: conduction and convection
7. The fluids used in electrolux refrigerator are
Options
A. water and hydrogen
B. ammonia and hydrogen
C. ammonia, water and hydrogen
D. none of these
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Discuss
Correct Answer: ammonia, water and hydrogen
8. The refrigerant after condensation process is cooled below the saturation temperature before throttling. Such a process is called
Options
A. sub-cooling or under-cooling
B. super-cooling
C. normal cooling
D. none of these
Show Answer
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Correct Answer: sub-cooling or under-cooling
9. In a parallel flow heat exchanger, the rate of flow of heat and the rate of decrease of temperature are maximum.
Options
A. Yes
B. No
Show Answer
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Discuss
Correct Answer: Yes
10. The boiling point of R-12 is about - 30°C.
Options
A. True
B. False
Show Answer
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Discuss
Correct Answer: True
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