Q. The local surface conductance for laminar film condensation on vertical surface is (where, t = film thickness)

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Q. Heat transfer co-efficient (h₁) for liquids increases with

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Q. A diathermaneous substance __________ the thermal radiation completely.

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Q. A hot body will radiate heat most rapidly, if its surface is

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Q. Evaporation of 1kg of water from a solution in a single effect evaporator requires about __________ kg of steam.

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Q. A metal wire of 0.01 m dia and thermal conductivity 200 W/m.K is exposed to a fluid stream with a convective heat transfer coefficient of 100 W/m².K. The Biot number is

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Q. Analogy between mass and heat transfer is not applicable in case of

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Q. A __________ surface has the maximum thermal emissivity out of the following.

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Q. Radiant energy received by a body is proportional to (where, d = the distance between the object emitting radiation and that receiving it.)

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Q. Film boiling is usually not desired in commercial equipments, because

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Q. For the same heat transfer area and the terminal conditions, the ratio of the capacities of a single effect evaporator to a triple effect evaporator is

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Q. The 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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Q. Film condensation is promoted on a/an __________ surface.

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Q. Dietus-Boelter equation cannot be used for molten metals mainly due to its very low

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Q. If Prandtl number is greater than the Schmidt number, then the

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Q. Which of the following accessories is provided in the vapor line of an evaporator for removing the entrained liquid ?

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Q. Rate of heat transfer by vaporisation from pools of water is affected by the

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Q. Multiple effect evaporators are commonly used in the manufacture of

P. Paper
Q. Superphosphate
R. Sugar
S. Fats

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Q. Which of the following has the highest thermal conductivity ?

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Q. For specified tube outside diameter, higher BWG means higher

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