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: 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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Cabinet tray dryers are not very effective as they do not completely strip off the moisture content from the food item. Hence, they need to be combined with another dryer for effective results.

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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: 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.

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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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Tunnel dryer is only a continuous version of a cabinet tray dryer.

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Advantage of turbo dryer over cabinet tray dryer is _____

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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: In coiled heat exchanger, the coils can be present inside and outside the vessel. Statement 2: The coils can have either hot/cold fluid present inside them or even electrical coils can be present.

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

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

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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: 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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Drying rate curve is plot between _____ and _____

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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: 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 (93.7k points)

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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: 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 (93.7k points)

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Although microwave heating can be used for drying of food containing uneven water content, it is isn’t done for certain food products like garlic. Why?

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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.

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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: 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: 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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