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Mechanical Engineering
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Heat Transfer, Refrigeration and Air Conditioning
Comments
Question
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
Correct Answer
both room sensible heat and latent heat loads
Heat Transfer, Refrigeration and Air Conditioning problems
Search Results
1. The natural convection air cooled condensers are used in
Options
A. domestic refrigerators
B. water coolers
C. room air conditioners
D. all of these
Show Answer
Scratch Pad
Discuss
Correct Answer: domestic refrigerators
2. The counter-current flow heat exchanger can transfer __________ heat than parallel flow heat exchanger.
Options
A. less
B. more
Show Answer
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Discuss
Correct Answer: more
3. 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.
Show Answer
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Discuss
Correct Answer:
4. The wet bulb temperature at 100% relative humidity is __________ dew point temperature.
Options
A. same as
B. lower than
C. higher than
Show Answer
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Discuss
Correct Answer: same as
5. The water, alcohol and ammonia have same refrigerating effect at different altitudes.
Options
A. Yes
B. No
Show Answer
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Discuss
Correct Answer: No
6. 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
Show Answer
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Discuss
Correct Answer: all of these
7. Which of the following would lead to a reduction in thermal resistance?
Options
A. In conduction, reduction in the thickness of the material and an increase in thermal conductivity.
B. In convection, stirring of the fluid and cleaning the heating surface.
C. In radiation, increasing the temperature and reducing the emissivity.
D. all of the above
Show Answer
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Discuss
Correct Answer: all of the above
8. The process, generally used in winter air-conditioning to warm and humidity the air, is called
Options
A. humidification.
B. dehumidification
C. heating and humidification
D. cooling and dehumidification
Show Answer
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Discuss
Correct Answer: heating and humidification
9. Which of the following refrigerant has the highest freezing point.
Options
A. Ammonia
B. Carbon dioxide
C. Sulphur dioxide
D. R-12
Show Answer
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Discuss
Correct Answer: Carbon dioxide
10. In mechanical refrigeration system, the refrigerant occurs as liquid between condenser and expansion valve.
Options
A. True
B. False
Show Answer
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Discuss
Correct Answer: True
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