Q481
Open questionWith increase in temperature, the total emissivity of conductors
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Chemical Engineering · all questionsHeat Transfer
Heat Transfer
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Q482
Open questionFor a fluid flowing in an annulus space, the wetted perimeter for heat transfer and pressure drop are
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Q483
Open questionDietus-Boelter equation used for the determination of heat transfer co-efficient is valid
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Q484
Open questionThe outlet temperature of cooling water in a heat exchanger is generally not allowed to exceed above 50°C in industrial practice mainly to avoid
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Q485
Open questionThe variation of thermal conductivity of a metal with temperature is often correlated using an expression of the form K = K0 + at. where, K is the thermal conductivity and T is the temperature (in °K). The units of 'a' in SI system will be
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Q486
Open questionThe inside heat transfer co-efficient in case of turbulent flow of liquid in the tube side in a 1-2 shell and tube heat exchanger is increased by __________ times, when the number of tube passes is increased to 8.
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Q487
Open questionElectromagnetic radiations propagate in vacuum with a velocity of __________ metre/second.
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Q488
Open questionWhich of the following is generally considered as opaque surface towards radiations?
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Q489
Open questionThe characteristic dimensionless groups for heat transfer to a fluid flowing through a pipe in laminar flow are
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Q490
Open questionHeat transfer by __________ may not necessarily require the presence of a medium.
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Q491
Open questionWhich is the most suitable for cold viscous feed?
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Q492
Open questionIn a forward feed multiple effect evaporator unit
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Q493
Open questionIn a shell and tube type heat exchanger, the floating tube bundle heat arrangement is used
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Q494
Open questionWhat is the unit of thermal conductivity?
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Q495
Open questionMultiple effect evaporators are commonly used in the manufacture of P. Paper Q. Superphosphate R. Sugar S. Fats
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Q496
Open questionNusselt number is a function of Prandtl number and __________ number of fluid in natural convection heat transfer.
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Q497
Open questionIn a heat exchanger with steam outside the tubes, a liquid gets heated to 45°C, when its flow velocity in the tubes is 2 m/s. If the flow velocity is reduced to 1 m/s, other things remaining the same, the temperature of the exit liquid will be
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Q498
Open questionThe left face of a one dimensional slab of thickness 0.2 m is maintained at 80°C and the right face is exposed to air at 30°C. The thermal conductivity of the slab is 1.2 W/m.K and the heat transfer co-efficient from the right face is 10 W/m2.K. At steady state, the temperature of the right face in °C is
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Q499
Open questionHeat flux through several resistances in series in analogous to the current flowing through several
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Q500
Open questionIn forced convection, the Nusselt number is a function of
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