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Which of the following is expected to have highest thermal conductivity

Q.  
Which of the following is expected to have highest thermal conductivity


Answer & Explanation

Answer :   Option: B


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More Questions Heat and Mass Transfer:

Q.  
Analogy between mass and heat transfer is not applicable in case of

A. same velocity profile or equal eddy diffusivities

B. thermal or pressure mass diffusion

C. viscous heating or chemical reaction

D. both (b) and (c).


Answer & Explanation

Q.  
Bulk of the convective heat transfer resistance from a hot tube surface to the fluid flowing in it, is

A. in the central core of the fluid.

B. uniformly distributed throughout the fluid.

C. mainly confined to a thin film of fluid near the surface

D. none of these


Answer & Explanation

Q.  
The Nusselt number for fully developed (both thermally and hydrodynamically) laminar flow through a circular pipe, where the wall heat flux is constant, is

A. 2.36

B. 4.36

C. 120.36

D. Depends on Reynolds number only


Answer & Explanation

Q.  
At what value of Prandtl number, the hydrodynamic and thermal boundary layers are identical

A. 0.5

B. 1

C. 1.5

D. 80


Answer & Explanation
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