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

Q. Drying rate curve is plot between _____ and _____

View solution

Q. The point where the constant drying period changes to falling rate period is called _____

View solution

Q. Which of the following denotes gas phase mass transfer coefficient?

View solution

Q. Statement 1: Removing of moisture content for grains in the food industry follows the thin layer model of drying bed.
Statement 2: The model for removing moisture from grains is computerized to find out the exact amount of time of exposure of grains for the removal of moisture.

View solution

Q. What does the thin layer model of drying beds in drying of grains depend on?

View solution