Heat Transfer The heat transfer by radiation from a mild steel surface is to be reduced by reducing the emissivity of the surface. This can be best achieved by Giving the surface a mirror finish Painting the surface white (with aluminium paint) Roughening the surface Painting the surface black Giving the surface a mirror finish Painting the surface white (with aluminium paint) Roughening the surface Painting the surface black ANSWER DOWNLOAD EXAMIANS APP
Heat Transfer (Cp . μ)/K is termed as the __________ number. Stanton Prandtl Nusselt Grashoff Stanton Prandtl Nusselt Grashoff ANSWER DOWNLOAD EXAMIANS APP
Heat Transfer Baffle spacing Is not the same as baffle pitch Should be less than the inside diameter of the shell Should be less than one fifth the diameter of the shell None of these Is not the same as baffle pitch Should be less than the inside diameter of the shell Should be less than one fifth the diameter of the shell None of these ANSWER DOWNLOAD EXAMIANS APP
Heat Transfer The absorptivity of a grey body at a given temperature __________ with increasing wavelength of radiation. Increases Remains constant May increase or decrease ; depends on the material Decreases Increases Remains constant May increase or decrease ; depends on the material Decreases ANSWER DOWNLOAD EXAMIANS APP
Heat Transfer In case of parallel flow heat exchanger, the lowest temperature theoretically attainable by the hot fluid is __________ the outlet temperature of the cold fluid. Either more or less than (depending upon the fluid) Equal to Less than More than Either more or less than (depending upon the fluid) Equal to Less than More than ANSWER DOWNLOAD EXAMIANS APP
Heat Transfer 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 R₂/(R₁+R₂) (R₁/R₂)2 1 R₂/(R₁+R₂) (R₁/R₂)2 1 ANSWER DOWNLOAD EXAMIANS APP
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