Heat Transfer MCQs

The number of kg vaporised per kg of steam fed to the evaporator is defined as

Circulation pump is located below the evaporater to

Dropwise condensation occurs on __________ surfaces.

The absorptivity of a body is equal to its emissivity

__________ equation relates the thermal conductivity of a solid to its temperature.

In case of heat flow by conduction for a cylindrical body with an internal heat source, the nature of temperature distribution is

Thermal conductivity of a conducting solid material depends upon its

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

Dropwise condensation of steam on cooling surface is promoted