In Biot number, the characteristic length used is the ratio of the _______________ of the solid?

Related Mcqs:

For a laminar flow of fluid in a circular tube, ‘h1’ is the convective heat transfer co-efficient at velocity ‘V1’. If the velocity is reduced by half and assuming the fluid properties are constant, the new convective heat transfer co-efficient is________________?

A. 1.26 h1 B. 0.794 h1 C. 0.574 h1 D. 1.741 h1...

In a shell and tube heat exchanger, floating head is used for _________________?

A. Large temperature differentials B. High heat transfer co-efficient C. Low pressure drop D. Less corrosion of tubes...

Corrosiveness of steam condensate is due to the presence of________________?

A. CO2 B. Dissolved O2 C. Both A. & B. D. Neither A. nor B....

A body cools down from 75°C to 70°C in 10 minutes. It will cool down from 70° C to 65° C in ______________ minutes?

A. 10 B. > 10 C. < 10 D. Either B. or C., depends on the mass of the body...

The maximum heat transfer co-efficient from steam heating will be attained when the steam is_________________?

A. Supersaturated B. Saturated C. Wet D. None of these...