Mechanical Engineering :: Heat Transfer,Refrigeration and Air Conditioning
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In a reversed Brayton cycle, the heat is absorbed by the air during
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Wet bulb temperature is the temperature of air recorded by a thermometer, when
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A device used for transfering heat from one fluid to another is called heat exchanger.
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The coefficient of performance (C.O.P.) of a refrigerator working as a heat pump is given by
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The temperature below which a gas is always liquified, is known as critical temperature.
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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.
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The ratio of surface convection resistance to the internal conduction resistance is known as
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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)
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Kirchhoff's law states that
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Dew point temperature is the temperature of air recorded by a thermometer, when the moisture present in it begins to condense.
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A.
the total radiation from a black body per second per unit area is directly proportional to the fourth power of the absolute temperature
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B.
the wave length corresponding to the maximum energy is proportional to the absolute temperature
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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
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D.
none of the above
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