Heat Transfer For turbulent flow in a tube, the heat transfer co-efficient is obtained from the Dittus-Boelter correlation. If the tube diameter is halved and the flow rate is doubled, then the heat transfer co-efficient will change by a factor of 6.1 37 1.74 1 6.1 37 1.74 1 ANSWER DOWNLOAD EXAMIANS APP
Heat Transfer The capacity of double-effect evaporator is less than half of the capacity of two single effects, each of which is operating over same terminal temperature difference, when the Evaporators opreate at atmospheric pressure Solution has an elevation of boiling point None of these Evaporators operate under vacuum Evaporators opreate at atmospheric pressure Solution has an elevation of boiling point None of these Evaporators operate under vacuum ANSWER DOWNLOAD EXAMIANS APP
Heat Transfer Heat exchangers operating, when the asymptotic range is reached, None of these Results in making part of the heating surface inactive Provide very large heat transfer co-efficient Results in abruptly increased velocity None of these Results in making part of the heating surface inactive Provide very large heat transfer co-efficient Results in abruptly increased velocity ANSWER DOWNLOAD EXAMIANS APP
Heat Transfer Heat sensitive materials can be concentrated in an evaporator employing High pressure None of these Vacuum High residence time High pressure None of these Vacuum High residence time ANSWER DOWNLOAD EXAMIANS APP
Heat Transfer A composite wall consists of two plates A and B placed in series normal to the flow of heat. The thermal conductivities are kA and kB and the specific heat capacities are CPA and CPB for plates A and B respectively. Plate B has twice the thickness of plate A. At steady state, the temperature difference across plate A is greater than that across plate B, when CPA > CPB KA < 0.5kB CPA < CPB KA>2 kB CPA > CPB KA < 0.5kB CPA < CPB KA>2 kB ANSWER DOWNLOAD EXAMIANS APP
Heat Transfer In regenerative air preheater (as practised in heating of coke ovens), the heat is transferred By heating an intermediate material (like chequor bricks) and then heating the air from this hot material None of these Through a metallic wall 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 None of these Through a metallic wall By direct contact of hot flue gas with air ANSWER DOWNLOAD EXAMIANS APP
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