Q. For heat flow through very thick walled cylinder, use____mean radius.

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Q. Indirect contact heat exchangers are preferred over direct contact heat exchangers, because

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Q. In SI units, fouling factor is expressed in

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Q. An ejector is used to

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Q. Extremely large or small volumes of fluids are generally best routed through the shell side of a shell and tube heat exchanger, because of the

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Q. All analogy equations connecting friction factor and heat transfer co-efficient apply only to

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Q. Electro-magnetic spectrum range, which is important for radiation varies from __________ microns.

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Q. 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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Q. In SI units, thermal conductivity is expressed in

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Q. Boiling point of a solution according to Duhring's rule is a linear function of the __________ of water.

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Q. The overall resistance for heat transfer through a series of flat resistance, is the __________ of the resistances.

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Q. At what value of Prandtl number, conduction is negligible in the turbulent core of a fluid flowing through a heated pipe ?

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Q. A sphere of radius 'R1' is enclosed in a sphere of radius 'R2'. The view (or shape) factor for radiative heat transfer of the outer sphere with respect to the inner sphere is

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Q. For a laminar flow of fluid in a circular tube, 'h1' is the convective heat transfer co-efficient at velocity 'V1'. If the velocity is reduced by half and assuming the fluid properties are constant, the new convective heat transfer co-efficient is

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Q. The main purpose of providing fins on heat transfer surface is to increase the

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Q. A BTU/hr.ft.² °F is equal to

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Q. Which of the following has the lowest Prandtl number ?

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Q. Choose the most important factor on which the heat conducted through a wall in a unit time will depend on ?

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

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Q. In a heat exchanger, one transfer unit means

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