Exercise: Heat Transfer Refrigeration And Air Conditioning

Questions for: Heat Transfer Refrigeration And Air Conditioning

Dew point temperature is the temperature of air recorded by a thermometer, when the moisture present in it begins to condense.
A:
Correct
B:
Incorrect
C:
D:
Answer: A
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Kirchhoff's law states that
A:
the total radiation from a black body per second per unit area is directly proportional to the fourth power of the absolute temperature
B:
the wave length corresponding to the maximum energy is proportional to the absolute temperature
C:
the ratio of the emissive power and absorptive power of all bodies is the same and is equal to the emissive power of a perfectly black body
D:
none of the above
Answer: C
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Relative humidity is given by (where pv = Partial pressure of water vapour, pb = Barometric pressure, ps = Pressure of saturated air, pd = Pressure at dry bulb temperature, pw = Saturation pressure corresponding to wet bulb temperature, and μ = Degree of saturation)
A:
B:
C:
D:
none of these
Answer: B
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The ratio of surface convection resistance to the internal conduction resistance is known as
A:
Grashoff number
B:
Biot number
C:
Stanton number
D:
Prandtl number
Answer: B
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A Bell Coleman refrigerator working on dense air system as compared to open air system, for the same range of temperature, results in higher coefficient of performance.
A:
Agree
B:
Disagree
C:
D:
Answer: A
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