Low thermal conductivity of heat insulating materials is due to its_________________?

Related Mcqs:

For what value of Prandtl number, St = f/2 ?

A. 1.5 B. 1 C. > 1 D. < 1...

Stefan’s block body radiation law can also be derived from ______________ law?

A. Kirchoff’s B. Planck’s C. Fourier’s D. None of these...

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...

Finned tube heat exchangers__________________?

A. Give larger area per tube B. Use metal fins of low thermal conductivity C. Facilitate very large temperature drop through tube wall D. Are used for smaller heat load...

The overall resistance for heat transfer through a series of flat resistance, is the _____________ of the resistances?

A. Average B. Geometric mean C. Product D. Sum...