Statement 1: In film theory, mass transfer coefficient is proportional to D^1/2 Statement 2: Penetration theory states that all elements are exposed at the same time which is unrealistic.

← Prev Question Next Question →

1 Answer

Related questions

+2 votes

1 answer

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.

asked Jan 30, 2022 in Food Engineering by Amelia (93.8k points)

+1 vote

1 answer

Statement 1: Duhring’s rule states that the ratio of temperatures at which two solutions have the same vapor pressure is constant. Statement 2: Duhring’s rule states that the boiling point of a solution is a linear function of the boiling point of pure water at the same pressure.

asked Jan 30, 2022 in Food Engineering by Amelia (93.8k points)

+1 vote

1 answer

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

asked Jan 30, 2022 in Food Engineering by Amelia (93.8k points)

+1 vote

1 answer

Statement 1: The factor F0 shows the microbial safety in the food item at the coldest point. Statement 2: F0 takes the time-temperature data at that particular point and compares conventional heating to microwave heating.

asked Jan 30, 2022 in Food Engineering by Amelia (93.8k points)

+2 votes

1 answer

Statement 1: Forward feeding requires pumps for the feed at every step. Statement 2: In a backward feeding arrangement, the most concentrated feed is exposed to the maximum steam in order to remove heat. This is its advantage.

asked Jan 30, 2022 in Food Engineering by Amelia (93.8k points)

+2 votes

1 answer

Statement 1: Evaporation is considered a mass and heat transfer operation. Statement 2: After evaporation, solids are left behind.

asked Jan 30, 2022 in Food Engineering by Amelia (93.8k points)

+1 vote

1 answer

Statement 1: Scraping improves heat transfer co-efficient by 5 times in case of non-Newtonian fluids. Statement 2: In food industry, major physical changes to food items when they’re processed, take place like transformation from Newtonian to Non-Newtonian fluids. Hence, scraped surface heat exchangers are very beneficial.

asked Jan 30, 2022 in Food Engineering by Amelia (93.8k points)

+1 vote

1 answer

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.

asked Jan 30, 2022 in Food Engineering by Amelia (93.8k points)

+1 vote

1 answer

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.

asked Jan 30, 2022 in Food Engineering by Amelia (93.8k points)

+1 vote

1 answer

Statement 1: A phase boundary exists between alcohol and oxygen. Statement 2: Phase boundary varies with agitation. It is inversely proportional to the amount of agitation provided.

asked Jan 30, 2022 in Food Engineering by Amelia (93.8k points)

+2 votes

1 answer

Statement 1: In a rising film evaporator, the feed can be very viscous. Statement 2: In a rising film evaporator, the feed cannot be heat sensitive.

asked Jan 30, 2022 in Food Engineering by Amelia (93.8k points)

+1 vote

1 answer

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.

asked Jan 30, 2022 in Food Engineering by Amelia (93.8k points)

+1 vote

1 answer

Statement 1: Plate heat exchangers are used in heat sensitive foods like milk. Statement 2: Principle behind plate heat exchangers is that there is very less space between the plates and hence quick heating can take place.

asked Jan 30, 2022 in Food Engineering by Amelia (93.8k points)

+2 votes

1 answer

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

asked Jan 30, 2022 in Food Engineering by Amelia (93.8k points)

+1 vote

1 answer

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.

asked Jan 30, 2022 in Food Engineering by Amelia (93.8k points)

+1 vote

1 answer

In plate evaporator, the heat transfer coefficient is high in spite of low residence time because _____

asked Jan 30, 2022 in Food Engineering by Amelia (93.8k points)

+2 votes

1 answer

Which of the following denotes gas phase mass transfer coefficient?

asked Jan 30, 2022 in Food Engineering by Amelia (93.8k points)

+1 vote

1 answer

Statement 1: In a multiple effect evaporator, the overall temperature drop is equal to the individual drops at each step. Statement 2: In a multiple effect evaporator, the total area is equal to the sum of the individual areas.

asked Jan 30, 2022 in Food Engineering by Amelia (93.8k points)

+1 vote

1 answer

Statement 1: Boiling point rise is due to the colligative properties due to the presence of solid particles in the solvent. Statement 2: Boiling point rise is due to the increase in pressure at the bottom of the solvent due to hydro-static head of the column.

asked Jan 30, 2022 in Food Engineering by Amelia (93.8k points)

+2 votes

1 answer

Statement 1: Generally, in small scaled jacketed pans, food products like jams, sauces etc are made. Statement 2: Baffles provide structural support to tubes, but they cannot prevent channeling.

asked Jan 30, 2022 in Food Engineering by Amelia (93.8k points)

+1 vote

1 answer

Statement 1: Difference between 1-1 and 1-2 heat exchanger is that 1-2 has both counter AND co current, whereas 1-1 has only co-current. Statement 2: 1-2 heat exchanger requires a high pressure drop.

asked Jan 30, 2022 in Food Engineering by Amelia (93.8k points)

+1 vote

1 answer

Statement 1: Microwave heating helps save electricity. Statement 2: The quality of product in microwave heating is good hence rejections are lesser.

asked Jan 30, 2022 in Food Engineering by Amelia (93.8k points)

+1 vote

1 answer

Statement 1: Scraped surface evaporators are used in the dairy industry. Statement 2: Plate evaporators can be used for viscous liquids.

asked Jan 30, 2022 in Food Engineering by Amelia (93.8k points)

+1 vote

1 answer

Statement 1: In microwave heating, heat is not applied to the food item. Statement 2: Radiation doesn’t gives even drying whereas microwave heating does.

asked Jan 30, 2022 in Food Engineering by Amelia (93.8k points)

+1 vote

1 answer

Statement 1: Vibro-fluidized bed dryer can reduce the air flow rate consumptions as air is only used for drying and not for fluidizing. Statement 2: _____ are often called desolventizers.

asked Jan 30, 2022 in Food Engineering by Amelia (93.8k points)

...