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Mechanical Engineering
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Heat Transfer, Refrigeration and Air Conditioning
Comments
Question
The wet bulb temperature at 100% relative humidity is __________ dew point temperature.
Options
A. same as
B. lower than
C. higher than
Correct Answer
same as
Heat Transfer, Refrigeration and Air Conditioning problems
Search Results
1. The water, alcohol and ammonia have same refrigerating effect at different altitudes.
Options
A. Yes
B. No
Show Answer
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Correct Answer: No
2. During gas charging in an ammonia vapour compression system, the connection is made at the compressor outlet.
Options
A. Agree
B. Disagree
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Correct Answer: Agree
3. The transfer of heat from one body to another takes place only when there is a temperature difference between the bodies.
Options
A. Yes
B. No
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Correct Answer: Yes
4. The sulphur sticks, in case of leakage of ammonia refrigerant, gives white smoke.
Options
A. True
B. False
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Correct Answer: True
5. Which of the following statement is correct?
Options
A. A grey body is one which absorbs all radiations incident on it.
B. At thermal equilibrium, the emissivity and absorptivity are same.
C. The energy absorbed by a body to the total energy falling on it, is called emissivity.
D. A perfect body is one which is black in colour.
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Correct Answer: At thermal equilibrium, the emissivity and absorptivity are same.
6. Thermal diffusivity of a substance is given by (where
h
= Thermal diffusivity, ? = Density of substance,
S
= Specific heat, and
k
= Thermal conductivity)
Options
A.
B.
C.
D.
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Correct Answer:
7. The counter-current flow heat exchanger can transfer __________ heat than parallel flow heat exchanger.
Options
A. less
B. more
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Correct Answer: more
8. The natural convection air cooled condensers are used in
Options
A. domestic refrigerators
B. water coolers
C. room air conditioners
D. all of these
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Correct Answer: domestic refrigerators
9. The conditioned air supplied to the room must have the capacity to take up
Options
A. room sensible heat load only
B. room latent heat load only
C. both room sensible heat and latent heat loads
D. none of the above
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Correct Answer: both room sensible heat and latent heat loads
10. A pressure gauge on the discharge side of a refrigerant compressor reads too high. The reasons will be
Options
A. lack of cooling water
B. water temperature being high
C. dirty condenser surface
D. all of these
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Correct Answer: all of these
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