Q161
Open questionWhich of the following is not concerned with the heat transfer?
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Chemical Engineering · all questionsHeat Transfer
Heat Transfer
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Q162
Open question1000 Kg of liquid at 30°C in a well stirred vessel has to be heated to 120°C, using immersed coils carrying condensing steam at 150°C. The area of the steam coils is 1.2 m2 and the overall heat transfer co-efficient to the liquid is 1500 W/m2.°C. Assuming negligible heat loss to the surrounding and specific heat capacity of the liquid to be 4 kJ/kg.°C, the time taken for the liquid to reach desired temperature will be
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Q163
Open questionA cube, sphere & a thin circular plate (all having same mass and made of same material) are all heated to 300°C and allowed to cool in natural air. Which one will cool the slowest ?
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Q164
Open questionChoose the correct equation.
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Q165
Open questionFouling factor for a heat exchanger is given by (where, U1 = heat transfer co-efficient of dirty surface U2 = heat transfer co-efficient of clean surface)
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Q166
Open questionA backward feed multiple effect evaporator is better than forward feed for concentrating cold feed, because it provides
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Q167
Open questionPick out the wrong statement.
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Q168
Open questionFilm boiling is usually not desired in commercial equipments, because
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Q169
Open questionNatural convection is characterised by
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Q170
Open questionAbsorptivity and refletivity of a perfect black body are respectively
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Q171
Open questionEconomy of a multiple effect evaporator depends upon the
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Q172
Open questionIn a forward feed multiple effect evaporator, the pressure is
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Q173
Open questionHeat produced when a steady state current, passes through an electrical conductor having resistance, 'R' is
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Q174
Open questionIn case of heat transfer by conduction in a hollow cylinder, __________ mean area is used to calculate the heat transfer rate.
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Q175
Open questionThe most conducive surface for dropwise condensation to occur is the __________ surface.
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Q176
Open questionThe non-dimensional temperature gradient in a liquid at the wall of a pipe is the
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Q177
Open questionCorrection is applied to LMTD for __________ flow.
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Q178
Open questionThe range of electromagnetic spectrum important in heat transfer by radiation is __________ microns.
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Q179
Open questionA black body does not __________ radiation.
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Q180
Open questionWhich is the best tube arrangement (in a shell and tube heat exchanger) if the fluids are clean and non-fouling?
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