Grashoff number, which is defined as g . β (Ts – T∞) ρ2. L3/μ2, is proportional to the ratio of buoyancy force to ____________ force?

Related Mcqs:

The Nusselt number for fully developed (both thermally and hydrodynamically) laminar flow through a circular pipe, where the wall heat flux is constant, is__________________?

A. 2.36 B. 4.36 C. 120.36 D. Dependent on NRe only...

Heat exchanger tubes are never made of_________________?

A. Plain carbon steel B. Stainless steel C. Lead D. Copper...

The rate of heat transfer is a product of overall heat transfer co-efficient, the difference in temperature and the___________________?

A. Heating volume B. Heat transfer area C. Nusselt number D. None of these...

Out of 100 kcal/second of incident radiant energy on the surface of a thermally transparent body, 300 kcal/second is reflected back. If the transmissivity of the body is 0.25, the emissivity of the surface will be_________________?

A. 0.35 B. 0.45 C. 0.55 D. 0.85...

Vacuum is generally maintained in the vapour space of an evaporator mainly to__________________?

A. Get economical temperature difference by using moderate pressure steam B. Facilitate forward feeding in multiple effect evaporation C. Concentrate heat sensitive materials D. Achieve very high concentration of the final product...