Multi-stage counter-current extraction is expensive as more extractors are needed to strip the solid off the solvent.

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Statement 1: Multi-stage cross-current extraction – the solids contain some amount of solute after every extraction. Statement 2: Single-stage batch extractor – Used in labs and not on large scale as a solvent is continuously subjected to heat.

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A multi stage continuous counter-current extractor has the advantages of both co and counter current processes.

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Statement 1: In counter-current extraction, equilibrium is reached at every stage. Statement 2: Right angled triangle method also called a difference point method is used to calculate the ideal number of stages for extraction.

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Statement 1: Solid food items containing water molecules are more soluble as the temperature increases. Statement 2: This growth takes place in steps.

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Statement 1: Presence of certain organic solvents in solvent extraction can prove to be carcinogenic. Statement 2: CO2 gas can be used in super critical fluid extraction.

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After extraction via solvent extraction, the cake serves to be a good source of _____

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Statement 1: Caffeine is the active principle in coffee. It cannot be stripped off it. Statement 2: Caffeine can be stripped off coffee by extraction.

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Statement 1: Partition coefficient pertains to solid-liquid extraction. Statement 2: Leaching involves both heat and mass transfer.

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If extraction is done at the _____ of the solvent, it is called _____

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Statement 1: Soya bean has a high oil content. Statement 2: If the oil content is high, extraction is done by solvent extraction alone.

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Statement 1: T-joints in pipelines for crystallization should be avoided as much as possible. Statement 2: Thin liquids should have a slope to drain off liquid.

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The ratio of concentration of a super saturated solution to a saturated solution is denoted by α’ which is stated by the Kelvin equation. How is it related to the crystal size and interfacial tension between solid and liquid?

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_____ is an important solvent for wet and edible materials.

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_____ gives the relationship between the concentration of gas entering stage n and concentration of liquid leaving stage n.

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What is extraction in paprika used for?

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Which of the following operations is carried out by extraction equipment?

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Liquid-liquid extraction is called leaching.

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Which of the following is the real extraction application of SCFE?

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Which among the following factors does NOT affect extraction?

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Statement 1: Vapor phase is always more of volatile components. Statement 2: Liquid phase is always more of high boiling point liquids.

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Statement 1: Incrustation may lead to under deposit-corrosion. Statement 2: Scrapers can be used as an agitated medium to avoid incrustation.

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Statement 1: Hydrogenation of fats involves liquid-gas phases only. Statement 2: Hydrogenation of fats is known as slurry reactor system.

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Statement 1: Smaller particles dissolve as they have a larger surface area and larger particles grow. Statement 2: The above process is called Ostwald ripening.

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Extremely small packing is favorable for packed towers as the surface area increases.

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Statement 1: Batch crystallizers are used for jaggery. Statement 2: Particle size is controlled by stirring and scraping the concentrate from the vessel for better heat transfer.

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