61. Viscous & heat sensitive liquids are concentrated in __________ evaporators.
62. Heat sensitive materials can be concentrated in an evaporator employing
63. The wavelength at which the maximum monochromatic emissive power occurs for a black body, is (where, T = absolute temperature of the black body)
64. In case of parallel flow heat exchanger, the lowest temperature theoretically attainable by the hot fluid is __________ the outlet temperature of the cold fluid.
65. A composite wall consists of two plates A and B placed in series normal to the flow of heat. The thermal conductivities are kA and kB and the specific heat capacities are CPA and CPB for plates A and B respectively. Plate B has twice the thickness of plate A. At steady state, the temperature difference across plate A is greater than that across plate B, when
66. In which mode of heat transfer, the Biot number is important?
67. When warm and cold liquids are mixed, the heat transfer is mainly by
68. For evaporation of viscous solution in a multiple effect evaporator, the prefered feeding scheme is
69. Pick out the wrong statement:
70. Air is to be heated by condensing steam. Two heat exchangers are available (i) a shell and tube heat exchanger and (ii) a finned tube heat exchanger. Tube side heat transfer area are equal in both the cases. The recommended arrangement is
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