Heat Transfer Fluid motion in the natural convection heat transfer between a solid surface and a fluid in contact with it, results from the None of these Buoyancy of the bubbles produced at active nucleation site Existence of thermal boundary layer Temperature gradient produced due to density difference None of these Buoyancy of the bubbles produced at active nucleation site Existence of thermal boundary layer Temperature gradient produced due to density difference ANSWER DOWNLOAD EXAMIANS APP
Heat Transfer Mode of heat transfer in which the fluid moves under the influence of changes in fluid pressure produced by external work is called Natural convection Conduction Radiation Forced convection Natural convection Conduction Radiation Forced convection ANSWER DOWNLOAD EXAMIANS APP
Heat Transfer Rate of heat transfer by vaporisation from pools of water is affected by the Surface tension of water Viscosity of water All of these Nature of heating surface and distribution of bubbles Surface tension of water Viscosity of water All of these Nature of heating surface and distribution of bubbles ANSWER DOWNLOAD EXAMIANS APP
Heat Transfer Electromagnetic radiations propagate in vacuum with a velocity of __________ metre/second. 3 x l012 3 x l010 3 x l08 3 x l05 3 x l012 3 x l010 3 x l08 3 x l05 ANSWER DOWNLOAD EXAMIANS APP
Heat Transfer Extended heat transfer surface like fins are used to increase the heat transfer rate. Fin efficiency is defined as the ratio of heat transferred across the fin surface to the theoretical heat transfer across an equal area held at the Surrounding temperature Average temperature of the fin Temperature of the fin end Constant temperature equal to that of the base Surrounding temperature Average temperature of the fin Temperature of the fin end Constant temperature equal to that of the base ANSWER DOWNLOAD EXAMIANS APP
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 Painting the surface black Roughening the surface Painting the surface white (with aluminium paint) Giving the surface a mirror finish Painting the surface black Roughening the surface Painting the surface white (with aluminium paint) Giving the surface a mirror finish ANSWER DOWNLOAD EXAMIANS APP
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