Froude number relates the gravitational effect which is important when the liquid is agitated by an impeller. When NRe,i < 300, NFr is ineffective.

The existence of a thick constant film between two phases is a proposal by the Film theory.

Drop-wise condensation does NOT take place on a smooth surface as the drops cannot adhere to the surface.

Both of the mentioned sentences with respect to centrifuge are true.

In a dairy industry, it is desired to obtain the cream from milk using a centrifuge. The cream which is the lighter liquid will stay in the center and milk will splash out radially.

According to Nusselt’s film theory, the film thickness increases as we move from bottom to top. The heat transfer decreases.

In flashing of jams, the temperature of concentrated jam decreases on flashing as the source of ignition is the solvent itself. Also, the vapor pressure of the concentrated jam sustains combustion as the temperature is brought down to the flash point which is the lowest temperature at which the vapor pressure is just sufficient to sustain combustion.

All of the mentioned, Capillary tube, Plate and Cone and Coaxial Cylinder are all names of viscometers.

It is difficult to predict the electric field intensity inside a food material. Design of oven plays an important role in determining the electric filed intensity in a food material. Orientations of microwaves is an important role.

One disadvantage with forward feeding is that the feed gets very concentrated at the beginning few units itself (due to direct steam supply with provides high heat) and hence it’s difficult to feed it to the next evaporator unit.