Heat Transfer Double pipe heat exchangers are preferably useful, when Requirement of heat transfer area is low High viscosity liquid is to be cooled Overall heat transfer co-efficient is very high A corrosive liquid is to be heated Requirement of heat transfer area is low High viscosity liquid is to be cooled Overall heat transfer co-efficient is very high A corrosive liquid is to be heated ANSWER DOWNLOAD EXAMIANS APP
Heat Transfer For small temperature difference, the heat transfer rate as per Newton's law of cooling is proportional to (where, Δt = excess temperature) Δt Δt² √Δt Δt³ Δt Δt² √Δt Δt³ ANSWER DOWNLOAD EXAMIANS APP
Heat Transfer As per Kirchoffs law, the ratio of the total radiating power to the absorptivity of a body depends on the temperature of the body only nature of material of body none of the listed here wavelength of monochromatic radiation temperature of the body only nature of material of body none of the listed here wavelength of monochromatic radiation ANSWER DOWNLOAD EXAMIANS APP
Heat Transfer The interchange factor for radiation heat transfer from surface 'x' to surface 'y' in case of an infinite parallel planes with emis-sivities εx & εy is given by Εx + εy Εx . εy (εx + εy)/(εx + εy - εx . εy) 1/εx + 1/εy Εx + εy Εx . εy (εx + εy)/(εx + εy - εx . εy) 1/εx + 1/εy ANSWER DOWNLOAD EXAMIANS APP
Heat Transfer Convective heat transfer, in which heat is transferred by movement of warmed matter is described by Newton's law of cooling Fick's law Fourier's law None of these Newton's law of cooling Fick's law Fourier's law None of these ANSWER DOWNLOAD EXAMIANS APP
Heat Transfer In a shell and tube heat exchanger, The relationship is not generalised There is no relationship between temperature drop and resistance The temperature drop is inversely proportional to the resistance across which the drop occurs The temperature drops in the two fluids and the wall are proportional to individual resistances The relationship is not generalised There is no relationship between temperature drop and resistance The temperature drop is inversely proportional to the resistance across which the drop occurs The temperature drops in the two fluids and the wall are proportional to individual resistances ANSWER DOWNLOAD EXAMIANS APP
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