Q461
Open questionViscous & heat sensitive liquids are concentrated in __________ evaporators.
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Chemical Engineering · all questionsHeat Transfer
Heat Transfer
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Q462
Open questionHeat sensitive materials can be concentrated in an evaporator employing
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Q463
Open questionThe wavelength at which the maximum monochromatic emissive power occurs for a black body, is (where, T = absolute temperature of the black body)
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Q464
Open questionIn case of parallel flow heat exchanger, the lowest temperature theoretically attainable by the hot fluid is __________ the outlet temperature of the cold fluid.
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Q465
Open questionA 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
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Q466
Open questionIn which mode of heat transfer, the Biot number is important?
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Q467
Open questionWhen warm and cold liquids are mixed, the heat transfer is mainly by
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Q468
Open questionFor evaporation of viscous solution in a multiple effect evaporator, the prefered feeding scheme is
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Q469
Open questionPick out the wrong statement:
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Q470
Open questionAir 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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Q471
Open questionThe steam ejector is used to
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Q472
Open questionThickness of thermal boundary layer is more compared to that of hydrodynamic boundary layer, when the value of Prandtl number is
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Q473
Open questionHeat transfer by conduction in the turbulent core of a fluid flowing through a heated pipe is negligible, if the value of Prandtl number is
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Q474
Open questionFor gases, the thermal conductivity increases with temperature rise. For liquids, with increase in concentration, its thermal conductivity generally
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Q475
Open questionIn a single evaporator system, the steam economy __________ by creating vacuum in the evaporator.
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Q476
Open questionOne 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
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Q477
Open questionjH factor for heat transfer is not a function of the __________ number.
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Q478
Open questionNusselt number (for forced convection heat transfer) is a function of the __________ number.
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Q479
Open questionPrandtl number is the reciprocal of
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Q480
Open questionBulk of the convective heat transfer resistance from a hot tube surface to the fluid flowing in it, is
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