This set of Fruits Processing Multiple Choice Questions & Answers (MCQs) focuses on “Fruit Processing Plants and Equipments”.
1. What is the limitation of using rack and cloth presses?
a) Labor intensive
b) Cost
c) Transparency
d) Usage of electricity
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Explanation: In a rack and cloth press the milled fruit pulp is placed in a nylon, Dacron, or polypropylene cloth. The racks are separated by hard wood or plastic. Rack and cloth presses are efficient. But they are very labor intensive as they require operation, cleaning, and repairing.
2. Which method is used for clarification of juice?
a) Decantation
b) Freezing
c) Boiling
d) Irradiation
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Explanation: Decantation is one of the easiest methods of clarification. The juices along solids are allowed to settle down; due to gravitational force the solids are settled at the bottom and the clear juice is decanted. The juices are generally stored at low temperature to increase the shelf life of the product.
3. Which enzyme is used for clarification of fruit juice?
a) Cellulases
b) Proteases
c) Lipase
d) Ribonuclease
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Explanation: Commercial pectic enzymes and other enzymes like amylases, cellulases, and glucose oxidase are now an integral part of fruit juice technology. They are used for juice extraction. They are also used in clarification process to obtain clear juice.
4. Why the enzyme pectinase is used in the fruit juice production?
a) Breaks down pectin
b) Increased shelf life
c) Respiration
d) Metabolism
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Explanation: Pectinase enzymes are used for extracting juice from puree. This is done when the enzyme pectinase breaks down the substrate pectin and the juice is extracted. The enzyme pectinase lowers the activation energy needed for the juice to be produced and catalyzes the reaction.
5. Which of the following process is similar to reverse osmosis?
a) Ultra filtration
b) Decantation
c) Sedimentation
d) Centrifugation
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Explanation: Ultrafiltration is one of the membrane filtration processes. It is like reverse osmosis. It requires the hydrostatic pressure to the force water over a membrane which is generally semi permeable. In this process, the suspended solids and high molecular weight components are retained. Whereas the water and low molecular weight components are passed through the semi permeable membrane.
6. Are these statements about the modified atmosphere membrane filtration true?
Statement 1: It does not produce filter cake.
Statement 2: No costs associated with the removal and disposal of this residue.
a) True, False
b) True, True
c) False, True
d) False, False
View Answer
Explanation: Membrane filtration achieves maximum purity. It has higher overall yields compared to other processes. In this process, filter cake is not produced. There are no other costs related with the elimination and discarding of residue.
7. What is the liquid called after centrifugation?
a) Supernatant liquid
b) Liquor
c) Centrifuged liquid
d) Liquid
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Explanation: Centrifugation is the one of the separation techniques. It depends on the centrifugal force to separate particles in a mixture with two distinct phases like liquid and solid phase. It consists of two components namely, sediment and centrifugate. The centrifugate is also known as supernatant liquid.
8. Which of the following causes haziness in juices?
a) Pectin
b) Protein
c) Lipids
d) Vitamin
View Answer
Explanation: Pectin and starch causes haziness in juices. For juices processing, both de-pectinization and de-starching are essential. Pectinase are used to breakdown pectin. Amylase and cellulases are used for starch breakdown.
9. Which of the methods is used for removing coarse particles from juice?
a) Straining
b) Decanting
c) Nano filtration
d) Ultra filtration
View Answer
Explanation: The fruit juice which is extracted consists of suspended solids. The fruit juice sometime contains fruit tissue, seed, skin, gums, pectic substances and proteins in colloidal suspension. The coarse particles are removed by straining and sedimentation process.
10. Depectinization reduces the viscosity and slipperiness of the pulp.
a) True
b) False
View Answer
Explanation: The depectinization is aimed to decrease the slipperiness and viscosity of the pulp. It permits the usage of decanters effectively. It is particularly useful in processing the mature fruits that has low juice yield production.
11. Which of the methods is used for removing fine particles from juice?
a) Straining
b) Decanting
c) Sedimentation
d) Ultra filtration
View Answer
Explanation: The clear juice is obtained by complete removal of all suspensions. It is done through filtration or clarification with the help of fining agents and enzymes. Fining agents used in juice processing are enzymes (pectolytic, starch liquefying, proteolytic), mechanical finings and chemical finings (gelatin, albumin, casein).
Sanfoundry Global Education & Learning Series – Fruits Processing.
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