71. The steam ejector is used to
72. Thickness of thermal boundary layer is more compared to that of hydrodynamic boundary layer, when the value of Prandtl number is
73. Heat transfer by conduction in the turbulent core of a fluid flowing through a heated pipe is negligible, if the value of Prandtl number is
74. For gases, the thermal conductivity increases with temperature rise. For liquids, with increase in concentration, its thermal conductivity generally
75. In a single evaporator system, the steam economy __________ by creating vacuum in the evaporator.
76. One kilogram of water at 0°C is changed to superheated steam of one atm pressure and 300°C. The major heat consumption in the process will be to
77. jH factor for heat transfer is not a function of the __________ number.
78. Nusselt number (for forced convection heat transfer) is a function of the __________ number.
79. Prandtl number is the reciprocal of
80. Bulk of the convective heat transfer resistance from a hot tube surface to the fluid flowing in it, is
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