Heat Transfer Rate of heat transfer by vaporisation from pools of water is affected by the Nature of heating surface and distribution of bubbles All of these Surface tension of water Viscosity of water Nature of heating surface and distribution of bubbles All of these Surface tension of water Viscosity of water 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 direct contact of hot flue gas with air By heating an intermediate material (like chequor bricks) and then heating the air from this hot material Through a metallic wall None of these By direct contact of hot flue gas with air By heating an intermediate material (like chequor bricks) and then heating the air from this hot material 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 Constant temperature equal to that of the base Temperature of the fin end Average temperature of the fin Surrounding temperature Constant temperature equal to that of the base Temperature of the fin end Average temperature of the fin ANSWER DOWNLOAD EXAMIANS APP
Heat Transfer Graetz number is given by kμ/mCp kL/mCp mCp/kL mCp/kμ kμ/mCp kL/mCp mCp/kL mCp/kμ ANSWER DOWNLOAD EXAMIANS APP
Heat Transfer Presence of a non-condensing gas in a condensing vapour increases the rate of condensation decreases thermal resistance is desirable to increase the film co-efficient None of the listed here increases the rate of condensation decreases thermal resistance is desirable to increase the film co-efficient None of the listed here ANSWER DOWNLOAD EXAMIANS APP
Heat Transfer A multiple effect evaporator as compared to a single effect evaporator of the same capacity has Lower steam economy Higher solute concentration in the product Lower heat transfer area Higher steam economy Lower steam economy Higher solute concentration in the product Lower heat transfer area Higher steam economy ANSWER DOWNLOAD EXAMIANS APP
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