Q241
Open questionThe critical radius of insulation for a spherical shell is (where, K = thermal conductivity of insulating material h0 = heat transfer coefficient at the outer surface)
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Chemical Engineering · all questionsHeat Transfer
Heat Transfer
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Q242
Open questionFinned tube heat exchangers
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Q243
Open questionFor an ideal black body
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Q244
Open questionThe sum of reflectivity and absorptivity for an opaque body is equal to
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Q245
Open questionWhich of the following is not used as a medium for high temperature heating?
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Q246
Open questionPrandtl number for most of dry gases is about
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Q247
Open questionWhich of the following is the most widely used heat insulating material for pipelines carrying steam?
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Q248
Open questionForced circulation evaporators are useful for the concentration of viscous, salting and scale forming liquors. Which of the following is a forced circulation evaporator?
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Q249
Open questionFouling factor
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Q250
Open questionIn SI units, fouling factor is expressed in
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Q251
Open questionCritical value of the __________ number governs the transition from laminar to turbulent flow in free convection heat transfer.
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Q252
Open questionIn a laboratory test run, the rate of drying was found to be 0.5 × 10-3 kg/m2.s, when the moisture content reduced from 0.4 to 0.1 on dry basis. The critical moisture content of the material is 0.08 on a dry basis. A tray dryer is used to dry 100 kg (dry basis) of the same material under identical conditions. The surface area of the material is 0.04 m2/kg of dry solid. The time required (in seconds) to reduce the moisture content of the solids from 0.3 to 0.2 (dry basis) is
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Q253
Open questionIn pipe flow, heat is transferred from hot wall to the liquid by
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Q254
Open questionHeat transfer in the laminar sublayer in case of a liquid flowing through a pipe, is mostly by
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Q255
Open questionIn a cooling tower, water becomes cool by
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Q256
Open questionSteam side heat transfer co-efficient in an evaporator is in the range of __________ kcal/hr.m2°C.
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Q257
Open questionLMTD for counterflow and prallel flow heat exchanger will be the same, when the
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Q258
Open questionIn a shell and tube heat exchanger, floating head is used for
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Q259
Open questionWhat is the steam economy in case of a single effect evaporator system?
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Q260
Open questionGraetz number is given by
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