Chemical Heat Transfer

A black body does not ____________ radiation? A. Absorb or emit B. Refract C. ReflectD. Both B. & C.

Fresh orange juice contains 12% (by weight) solids and the rest water 90% of the fresh juice is sent to an evaporator to remove water and subsequently mixed with the remaining 10% of fresh juice. The resultant product contains 40% solids. The kg of water removed from 1 kg fresh juice is__________________? A. 0.4 B….

Sensible heat absorbed by 1 lb of water when it is heated from 32 to 212°F may be around ______________ BTU? A. 180 B. 970 C. 3.97 D. Data insufficient, can’t be predicted

Stefan’s block body radiation law can also be derived from ______________ law? A. Kirchoff’sB. Planck’s C. Fourier’s D. None of these

What is the geometric mean of two heat transfer areas A1 and A2 ? A. √(A1 . A2) B. √(A1 + A2) C. ½ √(A1 . A2) D. 2 √(A1 . A2)

The ratio of velocity head to tube side return loss in case of a multipass shell and tube heat exchanger is ________________? A. 2 B. 1/2 C. 4D. 1/4

Which has the lowest Prandtl number ? A. Liquid metal B. Aqueous solution C. Water D. Lube oil

In case of heat flow by conduction for a cylindrical body with an internal heat source, the nature of temperature distribution is_________________? A. Linear B. HyperbolicC. Parabolic D. None of these

Heat flux increases with temperature drop beyond the Leiden frost point in the plot of heat flux vs. temperature drop for a boiling liquid, because___________________? A. Convection becomes important B. Conduction becomes importantC. Radiation becomes important D. Sub-cooled boiling occurs

‘Duhring’s plot’ is of use in_________________? A. Extractive distillationB. Evaporation C. Leaching D. Absorption