Exam 9: Heat Transfer and Thermal Properties: Part A

Heat produced when a steady state current, I passes through an electrical conductor having resistance, 'R' is

As per Kirchoff?s law, the ratio of the total radiating power to the absorptivity of a body depends on the

The statement that "maximum wavelength of radiation is inversely proportional to the temperature" is __________ law.

Baffle spacing

Heat flux is the time rate of heat transfer per unit

Thermal diffusivity is the most important in heat transfer by

Mechanical recompression evaporation is used in the production of

If Prandtl number is greater than the Schmidt number, then the

A diathermanous substance __________ the thermal radiation completely.

Steam consumption in kg/hr in case of an evaporator is given by (where, C & E are capacity the economy of the evaporator respectively).

In a shell and tube heat exchanger, the height of 25 percent cut baffles is equal to (where, D = inside diameter of shell).

Prandtl and Reynolds analogy are same, when Prandtl number is

The heat flux (from outside to inside) across an insulating wall with thermal conductivity, K = 0.04 W/m.°K and thickness 0.16m is 10 W/m² . The temperature of the inside wall is - 5°C. The outside wall temperature is

Dittus-Boelter equation cannot be used for molten metals mainly due to its very low

Fourier's law of heat conduction applies to __________ surfaces.

Pick out the wrong statement.

When vaporisation takes place directly at the heating surface, it is called

The actual temperature drop across the heating surface in an evaporator depends on the

Extended heat transfer surface like fins are used to increase the heat transfer rate. Fin efficiency is defined as the ratio of heat transferred across the fin surface to the theoretical heat transfer across an equal area held at the

Radiant energy received by a body is proportional to (where, d = the distance between the object emitting radiation and that receiving it.)