Q. A phase boundary between alcohol and water exists.

View solution

Q. Statement 1: Diffusion is faster than convective mass transfer.
Statement 2: Mass transfer is proportional to the area of contact.

View solution

Q. Statement 1: Resistance is inversely proportional to the inter-facial area.
Statement 2: The inter-facial area of a body is the area of the dispersed phase in a unit volume of the vessel.

View solution

Q. Ratio of equilibrium concentrations of solute A in liquid phase and gas phase i.e. CAL* and CAg* respectively is α. α is called _____

View solution

Q. Statement 1: Diffusion of gas component through the resistive film to the bulk of the liquid is the rate determining step.
Statement 2: Diffusion of gas component through the gas-liquid inter-phase is the rate determining step.

View solution

Q. In a packaging of dry grapes, the packaging material is made of polyethylene. The dry grapes have certain moisture content. Which of the following is true with respect to the diffusion of certain amount of moisture through the packing?

View solution

Q. Statement 1: Concentration is a product of diffusivity and solubility.
Statement 2: Permeability coefficient in case of food packaging can be written as product of partial pressure and solubility using Henry’s law.

View solution

Q. The existence of a thick constant film between two phases is a proposal by which of the following theories?

View solution

Q. Statement 1: Penetration theory states that mass transfer coefficient is directly proportional to diffusivity coefficient which was later proved wrong.
Statement 2: Penetration theory states that mass transfer is based on unsteady mass transfer.

View solution

Q. Statement 1: In film theory, mass transfer coefficient is proportional to D¹/².

Statement 2: Penetration theory states that all elements are exposed at the same time which is unrealistic.

View solution

Q. Which theory proposes that the film is continuously getting renewed and replaced by the bulk liquid?

View solution

Q. Statement 1: KLa is measured together and not separately.

View solution

Q. Which of the following is not a measuring technique of KLa?

View solution

Q. Which of the following is also called Oxygen balancing method?

View solution

Q. Sherwood number is _____

View solution

Q. Rayleigh number is _____

View solution

Q. Statement 1: Drying is used for preservation of food.
Statement 2: Convective drying is indirect drying and conductive drying is direct drying.

View solution

Q. On wet basis, the denominator stays constant whereas in moisture content on dry basis, the denominator changes.

View solution

Q. Moisture on dry basis cannot be more than a hundred percentage.

View solution

Q. The EMC-RH data is fitted to Henderson’s equation. Which of the following is true about the relative humidity with respect to food technology terminology?

View solution