Heat Transfer Vacuum is generally maintained in the vapour space of an evaporator mainly to Concentrate heat sensitive materials Facilitate forward feeding in multiple effect evaporation Get economical temperature difference by using moderate pressure steam Achieve very high concentration of the final product Concentrate heat sensitive materials Facilitate forward feeding in multiple effect evaporation Get economical temperature difference by using moderate pressure steam Achieve very high concentration of the final product ANSWER DOWNLOAD EXAMIANS APP
Heat Transfer Dietus-Boelter equation cannot be used for molten metals mainly due to its very low Grashoff number Prandtl number viscosity thermal conductivity Grashoff number Prandtl number viscosity thermal conductivity ANSWER DOWNLOAD EXAMIANS APP
Heat Transfer In regenerative air preheater (as practised in heating of coke ovens), the heat is transferred Through a metallic wall None of these By heating an intermediate material (like chequor bricks) and then heating the air from this hot material By direct contact of hot flue gas with air Through a metallic wall None of these By heating an intermediate material (like chequor bricks) and then heating the air from this hot material By direct contact of hot flue gas with air ANSWER DOWNLOAD EXAMIANS APP
Heat Transfer In case of evaporators, liquid entrainment results primarily due to high heat transfer rate foaming of the solution high vacuum in the evaporator high heat transfer rate high heat transfer rate foaming of the solution high vacuum in the evaporator high heat transfer rate ANSWER DOWNLOAD EXAMIANS APP
Heat Transfer Among liquids, water has a comparatively high value of thermal conductivity, due to its Partial ionisation High viscosity Low density Dense structure Partial ionisation High viscosity Low density Dense structure ANSWER DOWNLOAD EXAMIANS APP
Heat Transfer The number of kg vaporised per kg of steam fed to the evaporator is defined as Capacity Rate of vaporisation Rate of evaporation Economy Capacity Rate of vaporisation Rate of evaporation Economy ANSWER DOWNLOAD EXAMIANS APP
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