Q. Dietus-Boelter equation used for the determination of heat transfer co-efficient is valid

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Q. The range of electromagnetic spectrum important in heat transfer by radiation is __________ microns.

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Q. Use of transverse baffles in a shell and tube heat exchanger is done to increase the

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Q. The actual temperature drop across the heating surface of an evaporator depends on the

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Q. Economy of a multiple effect evaporator depends upon the

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Q. For the same heat load and mass flow rate in the tube side of a shell and tube heat exchanger, one may use multipass on the tube side, because it

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Q. When vaporisation takes place through a blanketting film of gas, the phenomenon is termed as __________ boiling.

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Q. Minimum recommended baffle spacing in a shell and tube heat exchanger is about (where, D = shell diameter)

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Q. Stefan-Boltzman law which describes the radiation heat transfer states that, it is proportional to (where, t = temperature in °C, T = absolute temperature in ° K )

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Q. The Nusselt number for fully developed (both thermally and hydrodynamically) laminar flow through a circular pipe, where the wall heat flux is constant, is

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Q. Among liquids, water has a comparatively high value of thermal conductivity, due to its

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Q. Reynold's analogy states that (where, St = Stanton number f = friction factor)

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Q. For evaporation of viscous solution in a multiple effect evaporator, the prefered feeding scheme is

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Q. The sum of reflectivity and absorptivity for an opaque body is equal to

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Q. The film thickness for laminar film condensation on vertical surface __________ from top to bottom.

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Q. What is the steam economy in case of a single effect evaporator system ?

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Q. If average heat transfer co-efficient is ha and the local coefficient at the end of the plate is hl then in case of heat transfer to a fluid flowing over a flat plate, heated over its entire length

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Q. jH factor for heat transfer is not a function of the __________ number.

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Q. The Fourier number (defined as a.t/L²) is used in the analysis of problem involving heat transfer by

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Q. The energy radiated from a surface Q at absolute temperature T is related as

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