Heat Transfer Choose the most important factor on which the heat conducted through a wall in a unit time will depend on? Material of the wall Area of the wall perpendicular to heat flow Temperature difference between the two surfaces of the wall Thickness of the wall Material of the wall Area of the wall perpendicular to heat flow Temperature difference between the two surfaces of the wall Thickness of the wall ANSWER DOWNLOAD EXAMIANS APP
Heat Transfer Heat exchangers operating, when the asymptotic range is reached, Provide very large heat transfer co-efficient Results in abruptly increased velocity None of these Results in making part of the heating surface inactive Provide very large heat transfer co-efficient Results in abruptly increased velocity None of these Results in making part of the heating surface inactive ANSWER DOWNLOAD EXAMIANS APP
Heat Transfer Shell side pressure drop in a shell and tube heat exchanger does not depend upon the Baffle spacing & shell diameter Tube diameter & pitch None of these Viscosity, density & mass velocity of shell side fluid Baffle spacing & shell diameter Tube diameter & pitch None of these Viscosity, density & mass velocity of shell side fluid ANSWER DOWNLOAD EXAMIANS APP
Heat Transfer The Nusselt number for fully developed (both thermally and hydrodynamically) laminar flow through a circular pipe whose surface temperature remains constant is 1.66 Dependent on NRe only 88.66 3.66 1.66 Dependent on NRe only 88.66 3.66 ANSWER DOWNLOAD EXAMIANS APP
Heat Transfer The absorptivity of a grey body at a given temperature __________ with increasing wavelength of radiation. Remains constant Increases May increase or decrease ; depends on the material Decreases Remains constant Increases May increase or decrease ; depends on the material Decreases ANSWER DOWNLOAD EXAMIANS APP
Heat Transfer Which of the following has the lowest Prandtl number? Water Molten sodium (a coolant used in fast breeder reactor) Transformer oil Dilute H₂SO₄ Water Molten sodium (a coolant used in fast breeder reactor) Transformer oil Dilute H₂SO₄ ANSWER DOWNLOAD EXAMIANS APP
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