71. If air (a non-condensing gas) is present in a condensing vapor stream, it will __________ the condensation rate of vapor.
72. In forced circulation, the heating element is injected
73. In a heat exchanger, the rate of heat transfer from the hot fluid to the cold fluid
74. The heat flux (from outside to inside) across an insulating wall with thermal conductivity, K = 0.04 W/m.°K and thickness 0.16 m is 10 W/m2. The temperature of the inside wall is -5°C. The outside wall temperature is
75. The rate of heat transfer from a vertical plate by natural convection depends upon the temperature differences (ΔT) between wall and outside bulk. The proportionality is given as
76. The radiation heat flux from a heating element at a temperature of 800°C, in a furnace maintained at 300°C is 8 kW/m2. The flux, when the element temperature is increased to 1000°C for the same furnace temperature is
77. Pick out the wrong statement.
78. Radiation energy is emitted by all the substances, which are above
79. The purpose of floating head in a heat exchanger is to
80. Extremely large or small volumes of fluids are generally best routed through the shell side of a shell and tube heat exchanger, because of the
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