Heat Transfer When does the heat generated by fluid friction becomes appreciable compared to the heat transferred between the fluids? When fluid flows past a smooth surface At low velocity None of these At high fluid velocity When fluid flows past a smooth surface At low velocity None of these At high fluid velocity 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 KA < 0.5kB KA>2 kB CPA > CPB CPA < CPB KA < 0.5kB KA>2 kB CPA > CPB CPA < CPB ANSWER DOWNLOAD EXAMIANS APP
Heat Transfer For large heat transfer area requirement, shell and tube heat exchanger is preferred, because it All of these Occupies smaller space Is more economical Is easy to operate and maintain All of these Occupies smaller space Is more economical Is easy to operate and maintain ANSWER DOWNLOAD EXAMIANS APP
Heat Transfer Use of transverse baffles in a shell and tube heat exchanger is done to increase the All of these Rate of heat transfer Turbulence of shell side fluid Flow velocity All of these Rate of heat transfer Turbulence of shell side fluid Flow velocity ANSWER DOWNLOAD EXAMIANS APP
Heat Transfer Radiation energy is emitted by all the substances, which are above 0°K 100°C none of the listed here 0°C 0°K 100°C none of the listed here 0°C ANSWER DOWNLOAD EXAMIANS APP
Heat Transfer In case of vertical tube evaporator, with increase in liquor level, the overall heat transfer co-efficient Decreases Is not affected May increase or decrease; depends on the feed Increases Decreases Is not affected May increase or decrease; depends on the feed Increases ANSWER DOWNLOAD EXAMIANS APP
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