Heat Transfer A steel sphere of radius 0.1 m at 400°K is immersed in an oil at 300°K. If the centre of the sphere reaches 350°K in 20 minutes, how long will it take for a 0.05 m radius steel sphere to reach the same temperature (at the centre) under identical conditions ? Assume that the conductive heat transfer co-efficient is infinitely large. 5 minutes 10 minutes 40 minutes 20 minutes 5 minutes 10 minutes 40 minutes 20 minutes ANSWER DOWNLOAD EXAMIANS APP
Heat Transfer Boiling point elevation of an ideal solution In independent of pressure Increases rapidly with temperature rise Decreases rapidly with temperature rise Both B and C In independent of pressure Increases rapidly with temperature rise Decreases rapidly with temperature rise Both B and C ANSWER DOWNLOAD EXAMIANS APP
Heat Transfer The ratio of velocity head to tube side return loss in case of a multipass shell and tube heat exchanger is 2 43832 4 43834 2 43832 4 43834 ANSWER DOWNLOAD EXAMIANS APP
Heat Transfer The advantage of using a 1 - 2 shell and tube heat exchanger over a 1 - 1 shell and tube heat exchanger is Lower tube side pressure drop Higher shell side heat transfer co-efficient Higher tube side heat transfer co-efficient Lower shell side pressure drop Lower tube side pressure drop Higher shell side heat transfer co-efficient Higher tube side heat transfer co-efficient Lower shell side pressure drop ANSWER DOWNLOAD EXAMIANS APP
Heat Transfer The purpose of providing expansion bellows in the shell of tubular exchanger is to Increase the heating load Impart structural strength Facilitate increase of shell length, if needed Account for the uneven expansion of shell and tube bundles Increase the heating load Impart structural strength Facilitate increase of shell length, if needed Account for the uneven expansion of shell and tube bundles ANSWER DOWNLOAD EXAMIANS APP
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