71. Increasing the liquor level in the evaporator results in the
72. Pick out the wrong statement.
73. A wall has two layers of materials A and B; each made of a different material. Both the layers have the same thickness. The thermal conductivity of materialA is twice that of B. Under the equilibrium, the temperature difference across the wall is 36°C. The temperature difference across the layer A is __________ °C.
74. It is not recommended to use a 1-2 shell and tube heat exchanger for a particular heat duty, whenever the LMTD correction factor is
75. In a forward feed multiple effect, the pressure build up will be
76. In a co-current double pipe heat exchanger used for condensing saturated steam over the inner tube, if the entrance and exit conditions of the coolant are interchanged, then the rate of condensation will
77. With increase in temperature, the thermal conductivity of a gas
78. With increase in temperature, the thermal conductivity of steel
79. A diathermaneous substance __________ the thermal radiation completely.
80. For a cold dilute feed to produce thick viscous liquor, backward feeding as compared to forward feeding results in
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