# Technical Interview Questions 16

Technical Interview Questions 16 contains questions about

151. What is difference between deposition and sublimation? What is difference between melting and freezing? What is difference between vaporization and condescension?

152. How much power required for agitation?

153. Difference between Absorption and Adsorption

154. Difference between Liquid and Aqueous

155. State Laws of conser

151. What is difference between deposition and sublimation?

What is difference between melting and freezing?

What is difference between vaporization and condescension?

Overall conversion

Solid into liquid called Melting.

Liquid into solid called freezing.

Liquid into gas called vaporization.

Gas into liquid called condensation.

Gas into solid called deposition.

Solid into gas called sublimation.

152. How much power required for agitation?

It is a function of RPM.

It is also depends on

• Viscosity of fluid
• Density of fluid.
• Dimensions of vessels and Impeller

It is related by dimensionless form as:

Where

P=power required for agitation

n = rotational speed of impeller

Da= diameter of impeller

९= density of fluid

μ=viscosity of fluid

For baffled vessels, Power number (Np) does not depend on the value of Froude number (Nfr). and it is only a function of Reynolds number (NRe).

Empirical correlations and charts are available with the dimensional groups to get Np. from which power required for agitation is calculated. This required power is supplied by means of electrical drive / gearbox assembly and transmitted to the vessels by the impeller attached with the shaft coupled to the drive.

The mechanical design of agiated vessel is calculated as per pressure vessel design codes such as ASME Section VIII Division 1 or IS 2825.

153. Difference between Absorption and Adsorption

In absorption, one substance (matter or energy) is taken into another substance. But in adsorption only the surface level interactions are taking place.

154. Difference between Liquid and Aqueous

• Liquid is a state of matter, while aqueous is a special type of liquid formed by dissolving a compound in water

• All aqueous solutions are liquids, but not all liquids are aqueous solutions

155. State Laws of conserv