What is the unit of thermal conductivity ?

Related Mcqs:

The non-dimensional temperature gradient in a liquid at the wall of a pipe is the ____________________?

A. Heat flux B. Nusselt number C. Prandtl number D. Schmidt number...

A black body does not ____________ radiation?

A. Absorb or emit B. Refract C. Reflect D. Both B. & C....

Electro-magnetic spectrum range, which is important for radiation varies from _____________ microns?

A. 1 to 100 B. 0.5 to 50 C. 10 to 100 D. 100 to 1000...

The Sieder-Tate correlation for heat transfer in turbulent flow in pipe gives Nu α Re0.8, where, Nu is the Nusselt number and Re is the Reynolds number for the flow. Assuming that this relation is valid, the heat transfer co-efficient varies with the pipe diameter D. as _________________?

A. D-1.8 B. D-0.2 C. D0.2 D. D1.8...

In sub-cooled boiling ?

A. Temperature of the heating surface is less than the boiling point of the liquid B. Temperature of the heating surface is more than the boiling point of the liquid C. Bubbles from heating surface are absorbed by the mass of the liquid D. Very large vapour space is necessary...