This set of Food Processing Unit Operations Multiple Choice Questions & Answers (MCQs) focuses on “Fundamentals of Filtration”.
1. What are the types of filtration?
a) Biological filtration
b) Chemical filtration
c) Mechanical filtration
d) Mechanical, biological and chemical filtration
View Answer
Explanation: Filtration is responsible for moving and cleaning the tank water by removing insoluble impurities. The three main types of filtration are mechanical, biological and chemical filtration.
2. What is the media used in chemical filteration?
a) Soap
b) Detergents
c) Salt
d) Activated carbons
View Answer
Explanation: The chemical method of filtration removes dissolved particulates from the water tank with the help of activated carbons, resins, and other adsorbents. Chemical filtration media helps to maintain water quality as unwanted dissolved matter adheres to it.
3. What is other name for biological filtration?
a) Oxygen cycle
b) Nitrogen cycle
c) Carbon cycle
d) Methane cycle
View Answer
Explanation: Biological filtration is the action of bacteria breaking down dangerous ammonia, converting them to nitrites, and then the nitrites to the less toxic nitrates. The process is also known as the nitrogen cycle.
4. Are these statements about the filtration true?
Statement 1: Separates desirable materials from ingredients, food and beverage products and waste streams.
Statement 2: Recover aromas.
a) True, False
b) True, True
c) False, True
d) False, False
View Answer
Explanation: The filtration aids in filtering unwanted materials from food and beverages. It separates desirable materials from ingredients, food and beverage products and waste streams. Concentrate ingredients such as tea or protein. Clarify and purify food and beverage products. It also recover aromas.
5. What is residue in filtration?
a) Solid portion after filtration
b) Solid portion before filtration
c) Liquid portion after filtration
d) Liquid portion before filtration
View Answer
Explanation: The residue is the solid portion obtained after a filtration process. The solid residue is trapped on the filter paper during the filtration. It could also signify that the residue is an undesired by-product of a chemical reaction.
6. Are these statements about the activated carbon true?
Statement 1: It removes odors.
Statement 2: It removes bacteria.
a) True, False
b) True, True
c) False, True
d) False, False
View Answer
Explanation: Carbon filtersremove the odor particles of the air and also neutralizing any odors that pass through. Activated carbon filters will not remove microbial contaminants like bacteria and viruses, calcium and magnesium, fluoride, nitrate.
7. What type of mixture is separated by filtration?
a) Solid-liquid mixture
b) Liquid -liquid mixture
c) Solid-solid mixture
d) Solid- gas mixture
View Answer
Explanation: Filtration is used for separating heterogeneous mixture. It is usually used for separating a solid-liquid mixture. It removes suspended solid matter from a liquid, by passing through the pores of filter. The liquid passed through the filter is termed as the filtrate.
8. Which of the following is not the driving force in filtration?
a) Vacuum centrifuge
b) Pressure
c) Gravity
d) Temperature
View Answer
Explanation: Filtration is usually used for separating a solid-liquid mixture. The driving forces in filtration are gravity, pressure, vacuum centrifuge. It removes suspended solid matter from a liquid, by passing through the pores of filter.
9. What is the law behind filtration?
a) Darcy’s law
b) Henry’s law
c) Dalton’s law
d) Newton’s law
View Answer
Explanation: The theory of filtration depends on the factors influencing the rate of filtration through the filtering medium, than the mechanism by which the particles are retained. The factors affecting the rate of filtration were studied in Darcy’s law.
10. Is carbon a chemical filtration?
a) True
b) False
View Answer
Explanation: Activated carbon is the most commonly used media for chemical filtration. It is used to remove organic pollutants, which cannot be removed by biological and mechanical filtration.
Sanfoundry Global Education & Learning Series – Food Processing Unit Operations.
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