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 The heat transfer co-efficient in film type condensation is __________ that for dropwise condensation. Lower than Is same as Half Greater than Lower than Is same as Half Greater than ANSWER DOWNLOAD EXAMIANS APP
Heat Transfer In Biot number, the characteristic length used is the ratio of the __________ of the solid. Perimeter to surface area Surface area to perimeter Volume to surface area Surface area to volume Perimeter to surface area Surface area to perimeter Volume to surface area Surface area to volume ANSWER DOWNLOAD EXAMIANS APP
Heat Transfer Nusselt number is the ratio of the temperature gradient at the wall to Heat flux Temperature difference None of these That across the entire pipe Heat flux Temperature difference None of these That across the entire pipe ANSWER DOWNLOAD EXAMIANS APP
Heat Transfer Which area is used in case of heat flow by conduction through a cylinder ? Arithmetic mean area Geometric mean area None of the listed here Logarithmic mean area Arithmetic mean area Geometric mean area None of the listed here Logarithmic mean area ANSWER DOWNLOAD EXAMIANS APP
Heat Transfer Steady state one dimensional heat flow by conduction as given by Fourier's low does not assume that Material is anisotropic There is no internal heat generation Boundary surfaces are isothermal Constant temperature gradient exists Material is anisotropic There is no internal heat generation Boundary surfaces are isothermal Constant temperature gradient exists ANSWER DOWNLOAD EXAMIANS APP
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