Chemical Heat Transfer Quiz 6
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Pick out the wrong statement ?
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3 / 50
Nusselt number is the ratio of the temperature gradient at the wall to__________?
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Overall heat transfer co-efficient of a particular tube is U1. If the same tube with some dirt deposited on either side has coefficient U2, then__________?
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Prandtl and Reynold?s analogies are identical for Prandtl number value of___________?
7 / 50
Pick out the correct statement ?
8 / 50
Nucleate boiling is promoted _____?
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Overall thermal resistance for conductive heat transfer through a series of flat resistances is equal to the______?
10 / 50
Pick out the wrong statement?
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Natural convection is characterised by___________?
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Prandtl number is the ratio of_________?
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Mechanical recompression evaporation is used in the production of______?
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Nusselt number is a function of Prandtl number and _______ number of fluid in natural convection heat transfer?
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Mode of heat transfer in which the fluid moves under the influence of changes in fluid pressure produced by external work is called________?
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Prandtl number for most of dry gases is about_________?
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Nusselt number is the ratio of the ______?
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Peclet number (Pe) is given by______?
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Multiple effect evaporation accounts for_____?
25 / 50
Multiple effect evaporation is generally recommended, when the________?
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Minimum recommended baffle spacing in a shell and tube heat exchanger is about (where, D = shell diameter)?
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Prandtl and Reynolds analogy are same, when Prandtl number is______?
28 / 50
Nusselt number (for forced convection heat transfer) is a function of the ______ number?
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Multipass heat exchangers are used________?
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Mode of heat transfer involved in the cooling of air cooled internal combustion engine is__________?
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Prandtl number is the reciprocal of______?
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Out of 100 kcal/second of incident radiant energy on the surface of a thermally transparent body, 300 kcal/second is reflected back. If the transmissivity of the body is 0.25, the emissivity of the surface will be__________?
36 / 50
Pick out the correct equation ?
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Overall heat transfer co-efficient for cooling of hydrocarbons by water is about__________?
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Out of the following four assumptions used in the derivation of the equation for LMTD [LMTD = (?t1 ? ?t2)/ln(?t1/?t2)], which one is subject to the largest deviation in practice ?
42 / 50
Pick out the wrong statement/
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Open pan evaporators are preferred to be used, when the solution to be concentrated is__________?
48 / 50
Prandtl number is given by___________?
49 / 50
Multiple effect evaporators ar used to_____?
50 / 50
Planck?s distribution law is valid for ______ bodies?
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