Statement 1: Horizontal tube evaporator is easy for cleaning. Statement 2: Horizontal tube evaporator has a disadvantage of hindering agitation of the feed.

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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.

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One disadvantage with backward feeding is that the feed gets very concentrated at the beginning few units itself and hence it’s difficult to feed it to the next evaporator unit.

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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.

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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.

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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.

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Statement 1: Which tray dryer has indirect heating? Statement 2: Which tray dryer is good for making powders?

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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.

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

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Statement 1: Cabinet tray dyers can be used for heat sensitive materials. Statement 2: Bin dryer is used for materials which follow the falling rate drying curve.

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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.

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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.

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Statement 1: Cabinet tray dryers are used for storing grains. Statement 2: Cabinet tray dryers are used for low cost foods.

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

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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.

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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.

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

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Statement 1: When alcohol is allowed to move from chamber A to chamber B when a barrier between them is removed, it is called multi phase diffusion. Statement 2: When oxygen is made to diffuse into the water, it’s called continuous molecular diffusion.

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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.

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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.

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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.

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

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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.

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

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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.

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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 (93.7k points)

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