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Evaporation

FPE Final Exam

What is evaporation used for? To remove water from dilute liquid foods to obtain concentrated liquid products.
How is evaporation different than dehydration? Evaporation is for liquid foods whereas dehydration is for solid foods.
The presence of _____ in an evaporator causes the temperature difference between steam and the product to _____, and the product boils at relatively ____ temperatures. vacuum, increase, low
What is the difference between a single-effect and a multiple-effect evaporator? Single-effect: vapors are discarded; multiple-effect: vapors are reused for another evaporator chamber.
Define a forward feed system. The product from one effect becomes the feed for the next in a multiple-effect evaporator.
T or F: As water is removed from a product, the liquid has increased rate of heat transfer. False
Define boiling-point elevation. The increase in boiling point over that of pure water, at a given pressure.
T or F: The relationship between boiling-point of a solution versus water is linear. True
The heat transfer area per unit volume in a pan evaporator is _____. small
Heating of the product in a pan evaporator occurs mainly due to natural ______. convection
T or F: Rising-film evaporators are primarily used for high-viscosity foods. False
A rising-film evaporator requires a temperature differential of at least ____ degrees between the product and the heating medium. 14
T or F: A falling-film evaporator is more difficult to control uniform flowing than a rising-film evaporator. True
Falling-film evaporators utilize _____ _____. spray nozzles
T or F: A falling-film evaporator allows less effects than a rising-film evaporator. False
A forced-circulation evaporator utilizes a _____ heat exchanger. noncontact
T or F: Forced circulation evaporators are most cost effective. True
An agitated thin-film evaporator can be used for _____ viscosity foods. high
T or F: Agitated thin-film evaporators have relatively low rates of heat transfer. False
What are two disadvantages of agitated thin-film evaporators? High cost, low processing capability
Plate evaporators use principles from what other three types of evaporators? Rising/falling-film, wiped-film, forced-circulation
Created by: goberoi
 

 



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