The ratio of Murphree plate efficiency to point efficiency is 1 in a ________ flow model?

Use of excess of combustion air in the combustion of fuels results in________?

Though increased pressure has a retarding effect on cracking reaction, yet in actual process, a positive pressure of 10-15 kgf/cm2 is maintained during cracking mainly to________?

Pick out the wrong statement?

In a drilling process, the metal is removed by both shearing & extrusion. General purpose drills are made of________?

Nusselt number is a function of Prandtl number and ________ number of fluid in natural convection heat transfer?