Heat Transfer A hollow sphere and a solid sphere of the same material and equal radii are heated to the same temperature. In this case, Both will absorb equal amount of radiation from the surrounding in the beginning Both B & C The cooling rate will be the same for the two spheres and hence the two spheres will have equal temperatures at any instant Both the spheres will emit equal amount of radiation per unit time in the beginning Both will absorb equal amount of radiation from the surrounding in the beginning Both B & C The cooling rate will be the same for the two spheres and hence the two spheres will have equal temperatures at any instant Both the spheres will emit equal amount of radiation per unit time in the beginning ANSWER DOWNLOAD EXAMIANS APP
Heat Transfer The Nusselt number for fully developed (both thermally and hydrodynamically) laminar flow through a circular pipe, where the wall heat flux is constant, is Dependent on NRe only 4.36 120.36 2.36 Dependent on NRe only 4.36 120.36 2.36 ANSWER DOWNLOAD EXAMIANS APP
Heat Transfer A tank painted with which of the following coloured paints, would heat up maximum by radiation from sun? Yellow paint Black paint White paint Grey paint Yellow paint Black paint White paint Grey paint ANSWER DOWNLOAD EXAMIANS APP
Heat Transfer Analogy between mass and heat transfer is not applicable in case of Viscous heating or chemical reaction Same velocity profile or equal eddy diffusivities Both B and C Thermal or pressure mass diffusion Viscous heating or chemical reaction Same velocity profile or equal eddy diffusivities Both B and C Thermal or pressure mass diffusion ANSWER DOWNLOAD EXAMIANS APP
Heat Transfer Critical value of the __________ number governs the transition from laminar to turbulent flow in free convection heat transfer. Reynolds Prandtl & Grashoff Grashoff Both A & B Reynolds Prandtl & Grashoff Grashoff Both A & B ANSWER DOWNLOAD EXAMIANS APP
Heat Transfer In a co-current double pipe heat exchanger used for condensing saturated steam over the inner tube, if the entrance and exit conditions of the coolant are interchanged, then the rate of condensation will Decrease Remain unchanged Increase Either increase or decrease; depends on the coolant flow rate Decrease Remain unchanged Increase Either increase or decrease; depends on the coolant flow rate ANSWER DOWNLOAD EXAMIANS APP
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