Which of the following has the lowest Prandtl number ?

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Pick out the wrong statement ?

A. Heat transfer from a hot body to cold body by the emission of heat waves is called radiation B. Filmwise condensation takes place on non-wettable surfaces C. The boiling point of a solution is affected by liquid head as well as boiling point elevation D. None of these...

Minimum recommended baffle spacing in a shell and tube heat exchanger is about (where, D = shell diameter)?

A. 0.2 D B. 0.5 D C. 0.66 D D. 0.80 D...

A composite wall consists of two plates A and B placed in series normal to the flow of heat. The thermal conductivities are kA and kB and the specific heat capacities are CPA and CPB for plates A and B respectively. Plate B has twice the thickness of plate A. At steady state, the temperature difference across plate A is greater than that across plate B, when_________________?

A. CPA > CPB B. CPA < CPB C. kA < 0.5 kB D. kA >2 kB...

Radiation energy is emitted by all the substances, which are above____________________?

A. 0°K B. 0°C C. 100°C D. Room temperature...

Which of the following situations can be approximated to a steady state heat transfer system ?

A. A red hot steel slab (having outside surface temperature as 1300°C) exposed to the atmospheric air at 35°C B. 10 kg of dry saturated steam at 8 kgf/cm2 flowing through a short length of stainless steel pipe exposed to atmospheric air at 35°C C. Boiling brine kept in open vessel when the bottom surface … Which of the following situations can be approximated to a steady state heat transfer system ?Read More...