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Mechanical Engineering
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Heat Transfer, Refrigeration and Air Conditioning
Comments
Question
As relative humidity decreases, the dew point temperature will be __________ wet bulb temperature.
Options
A. same as
B. lower than
C. higher man
Correct Answer
lower than
Heat Transfer, Refrigeration and Air Conditioning problems
Search Results
1. The heat transfer by conduction through a thick sphere is same as through a thick cylinder.
Options
A. True
B. False
Show Answer
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Correct Answer: False
2. In a psychrometric process, the sensible heat added is 30 kJ/s and the latent heat added is 20 kJ/s. The sensible heat factor for the process will be
Options
A. 0.3
B. 0.6
C. 0.67
D. 1.5
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Correct Answer: 0.6
3. For ammonia refrigerating systems, the tubes of a shell and tube condenser are made of
Options
A. copper
B. aluminium
C. steel
D. brass
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Correct Answer: steel
4. A water cooled condenser operates at a __________ condensing temperature than an air-cooled condenser.
Options
A. higher
B. lower
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Correct Answer: lower
5. Defrosting of a refrigerator may be done by stopping the compressor for a short period.
Options
A. Correct
B. Incorrect
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Correct Answer: Correct
6. Which of the following statement is wrong?
Options
A. The heat transfer in liquid and gases takes place according to convection.
B. The amount of heat flow through a body is dependent upon the material of the body.
C. The thermal conductivity of solid metals increases with rise in temperature,
D. Logarithmic mean temperature difference is not equal to the arithmetic mean temperature difference.
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Correct Answer: The thermal conductivity of solid metals increases with rise in temperature,
7. During adiabatic saturation process on unsaturated air __________ remains constant.
Options
A. relative humidity
B. dew point temperature
C. dry bulb temperature
D. wet bulb temperature
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Correct Answer: wet bulb temperature
8. The tool made of cemented carbide wear out faster at
Options
A. slow speeds
B. medium speeds
C. fast speeds
D. very fast speeds
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Correct Answer: slow speeds
9. The lead screw of a lathe has __________ threads.
Options
A. single start
B. double start
C. multi-start
D. any one of these
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Correct Answer: single start
10. The cutting tool in a milling machine is mounted on
Options
A. spindle
B. arbor
C. column
D. knee
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Correct Answer: arbor
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