Q1. In which of the following step of the edible oil refining process, the citric acid is added towards the end of the process?

1. Deodorization
2. Neutralization
3. Bleaching
4. Winterization

ANSWER: A. Deodorization

• Explanation: Citric acid, which serves as a chelating agent to complex with trace metals, is added to the deodorized oil during the cooling stage of the deodorization process. Citric acid requires a dosage of 50 ppm and an adding temperature of 143°C under a normal vacuum with stripping steam. Citric acid aids in binding trace metals and the decomposition of residual soaps.

READ MORE – Food Science & Technology Quiz (01-03-2022)

Q2. Which of the following is not the characteristic feature of enzymatic interesterification?

1. Low temperature
2. Catalyst specificity
3. Low by-products
4. Dark color of oil

ANSWER: D. Dark color of oil

• Explanation – Chemical interesterification uses a range of chemicals as a catalyst and necessitates high temperatures and pressure, resulting in deeper oil color and certain by-products. Enzymatic interesterification, on the other hand, employs biologically generated enzymes with stereospecificity and the ability to specifically alter fatty acids. The packed columns of an enzyme reactor are typically kept at 60-70°C. It also doesn’t produce any color, and the by-products are far less.

READ MORE – Food Science & Technology Quiz (11-02-2022)

Q3. Which is the first zone for the material flow in the screw press expeller?

1. Feeding zone
2. Transport zone
3. Compression zone
4. Exudation zone

ANSWER – A. Feeding zone

• Explanation: The oilseeds are fed into the expeller from the hopper in the feeding zone. Screws deliver these seeds to the compression zone. The seeds are crushed in this zone, and the air between them is expelled. The crushed seeds are squeezed and oil is exuded out in the exudation zone. Finally, the pressure is released, causing the metal to expand.

READ MORE – Food Science & Technology Quiz (21-03-2022)

Q4. ____________ is provided to permit the drainage of oil in screw-press oil extractor.

1. Cake bars
2. Spacer
3. Choke
4. D. Ring

ANSWER: B. Spacer

• Explanation: Spacers are utilized between the lining bars in a screw-press oil extractor to allow oil to drain as the pressure on the feed material is increased. Rings are used to raising the density of the product and the material’s pressure buildup. A moveable cone or choke at the discharge end regulates the working pressure by adjusting the width of the annular space through which the press cake must pass.

READ MORE – Food Science & Technology Quiz (05-02-2022)

Q5. Which of the following is not utilized as a catalyst in chemical interesterification?

1. Zinc acetate
2. Sodium ethylate
3. Tin acetate
4. Aluminum acetate

ANSWER:  D. Aluminum acetate

• Explanation – Zinc and tin acetates are high-temperature catalysts, but sodium ethylate is a low-temperature catalyst utilized in chemical interesterification. Aluminum acetate, on the other hand, is a topical astringent and antiseptic. Aluminum acetate is used to treat infected skin inflammation, itching, and stinging while also promoting healing.

READ MORE – Food Science & Technology Quiz (31-03-2022)

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