Air is best heated with steam in a heat exchanger of________?

In a shell and tube heat exchanger, the overall heat transfer co-efficient is proportional to the tube side (volumetric flow rate)0.8. This is valid, only when the ratio of the tube side film resistance to the total resistance is almost equal to________?

In turbulent flow, a rough pipe has the same friction factor as a smooth pipe________?

Diameter of rivet hole (d, mm) and the plate thickness (t, mm) are related by Unwin’s formula as________?

Carborundum consists mainly of________?

Low viscosity absorbent is preferred for reasons of ________?