Planck's law holds good for all coloured bodies.

More Questions from Heat Transfer, Refrigeration and Air Conditioning

• The reduced ambient air cooling system has
• 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)
• The thermal diffusivity for solids is generally less than those for liquids and gases.
• The by-pass factor (B. P. F.) in case of sensible heating of air is (Where td1 = Dry bulb temperature of air entering the heating coil, td2 = Dry bulb temperature of air leaving the heating coil, and td3 = Dry bulb temperature of heating coil)
• A condenser of refrigeration system rejects heat at the rate of 120 kW, while its compressor consumes a power of 30 kW. The coefficient of performance of the system will be
• The capacity of a domestic refrigerator is in the range of
• Carbon dioxide is
• The difference between dry bulb temperature and dew point temperature, is called
• Conduction is the process of heat transfer from one particle of the body to another by the actual motion of the heated particles.
• If the condenser temperature is kept constant, the coefficient of performance of a refrigeration cycle increases with the increase in evaporator temperature.

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