Grashoff number is given by________________?

Related Mcqs:

If the thermal conductivity of a wall material is independent of temperature, the steady state temperature distribution in the very large thin plane wall having steady, uniform surface temperature follows _____________ law?

A. Parabolic B. Hyperbolic C. Linear D. Logarithmic...

‘Duhring’s plot’ is of use in_________________?

A. Extractive distillation B. Evaporation C. Leaching D. Absorption...

When warm and cold liquids are mixed, the heat transfer is mainly by_______________?

A. Conduction B. Convection C. Radiation D. Both A. & C....

Heat transfer rate described by Fourier’s law will decrease, if the _____________ increases?

A. Thermal conductivity B. Thickness C. Temperature difference D. Heat transfer area...

It is desired to concentrate a 20% salt solution (20 kg of salt in 100 kg of solution) to a 30% salt solution in an evaporator. Consider a feed of 300 kg/min at 30°C. The boiling point of the solution is 110°C, the latent heat of vaporisation is 2100 kJ/kg and the specific heat of the solution is 4 kJ/kg.K. The rate at which the heat has to be supplied in (kJ/min) to the evaporator is____________________?

A. 3.06 × 105 B. 6.12 × 105 C. 7.24 × 105 D. 9.08 × 105...