Heat Transfer The thermal radiation emitted by a body is proportional to Tn, where T is its absolute temperature. The value of 'n' is exactly 4 for All bodies A black body Polished bodies only Black painted bodies only All bodies A black body Polished bodies only Black painted bodies only ANSWER DOWNLOAD EXAMIANS APP
Heat Transfer A 10 cm dia steam pipe, carrying steam at 180°C, is covered with an insulation (conductivity = 0.6 W/m.°C). It losses heat to the surroundings at 30°C. Assume a heat transfer co-efficient of 0.8 W/m².°C for heat transfer from surface to the surroundings. Neglect wall resistance of the pipe and film resistance of steam. If the insulation thickness is 2 cms, the rate of heat loss from this insulated pipe will be Less than that of the uninsulated steam pipe Greater than that for uninsulated steam pipe Less than the steam pipe with 5 cms insulation Equal to that of the uninsulated steam pipe Less than that of the uninsulated steam pipe Greater than that for uninsulated steam pipe Less than the steam pipe with 5 cms insulation Equal to that of the uninsulated steam pipe ANSWER DOWNLOAD EXAMIANS APP
Heat Transfer In a multipass shell and tube heat exchanger, tube side return pressure loss is equal to __________ the velocity head square root of twice four times none of the listed here square root of twice four times none of the listed here ANSWER DOWNLOAD EXAMIANS APP
Heat Transfer A composite flat wall of a furnace is made of two materials 'A' and 'B'. The thermal conductivity of 'A' is twice of that of material 'B', while the thickness of layer of 'A' is half that of B. If the temperature at the two sides of the wall are 400 and 1200°K, then the temperature drop (in °K) across the layer of material 'A' is 150 133 160 125 150 133 160 125 ANSWER DOWNLOAD EXAMIANS APP
Heat Transfer Presence of a non-condensing gas in a condensing vapour decreases thermal resistance None of the listed here increases the rate of condensation is desirable to increase the film co-efficient decreases thermal resistance None of the listed here increases the rate of condensation is desirable to increase the film co-efficient ANSWER DOWNLOAD EXAMIANS APP
Heat Transfer Prandtl and Reynolds analogy are same, when Prandtl number is 1 1.5 0.5 > 2 1 1.5 0.5 > 2 ANSWER DOWNLOAD EXAMIANS APP
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