Heat Transfer
Choose the most important factor on which the heat conducted through a wall in a unit time will depend on?

Material of the wall
Temperature difference between the two surfaces of the wall
Thickness of the wall
Area of the wall perpendicular to heat flow

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

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

ANSWER DOWNLOAD EXAMIANS APP