51. Absorptivity of a body will be equal to its emissivity
52. In a heat exchanger with one fluid evaporating or condensing, the surface area required is least in
53. A steam pipe is to be lined with two layers of insulating materials of different thermal conductivities. For the minimum heat transfer,
54. The ratio of Nusselt number and the product of Reynold's number and Prandtl number is equal to
55. The product of Reynolds number and Prandtl number is known as
56. Upto the critical radius of insulation,
57. Fourier's law of heat conduction is (where Q = Amount of heat flow through the body in unit time, A = Surface area of heat flow, taken at right angles to the direction of heat flow, dT = Temperature difference on the two faces of the body, dx = Thickness of the body, through which the heat flows, taken along the direction of heat flow and k = Thermal conductivity of the body)
58. In counter current flow heat exchanger, the logarithmic temperature difference between the fluids is ________ as compared to parallel flow heat exchanger.
59. In counter flow heat exchangers
60. The energy distribution of an ideal reflector at higher temperatures is largely in the range of
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