Food Processing Unit Operations Mcqs

Q:

What is the temperature of thermisation for milk?

A) 125 – 138°C B) 115 – 120°C
C) 63°C D) 63 – 65°C
 
Answer & Explanation Answer: D) 63 – 65°C

Explanation: Ultra-pasteurization temperature is 125 – 138°C for 2-4 seconds. Sterilization of milk in container is 115 – 120°C for 20-30 minutes. LTLT pasteurization of milk is 63°C for 30 minutes and for thermisation it is 63 – 65°C for 15 seconds.

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16
Q:

What is skimming efficiency?

A) The amount of fat that can be separated from milk B) The amount of skim milk that can be separated from whole milk
C) The amount of fat that is added to milk D) The amount of skim milk that is added to whole milk
 
Answer & Explanation Answer: A) The amount of fat that can be separated from milk

Explanation: The amount of fat that can be separated from milk and it depends on the design of the separator, the flow rate of milk and the size distribution of the fat globules.

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31
Q:

What is the temperature of LTLT pasteurization for milk?

A) 125 – 138°C B) 115 – 120°C
C) 63°C D) 63 – 65°C
 
Answer & Explanation Answer: C) 63°C

Explanation: Ultra-pasteurization temperature is 125 – 138°C for 2-4 seconds. Sterilization of milk in container is 115 – 120°C for 20-30 minutes. LTLT pasteurization of milk is 63°C for 30 minutes and for thermisation it is 63 – 65°C for 15 seconds.

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16
Q:

Which of the following dryer used to manufacture milk powder?

A) Spray dryer B) Cabinet tray dryer
C) Pneumatic dryer D) Fluidized bed dryer
 
Answer & Explanation Answer: A) Spray dryer

Explanation: Spray dyer is used to produce powder from the solution. It dries the solution stream and separates the solute and evaporates the solvent and forms vapor. The solid particles are collected in a cyclone or drum.

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9
Q:

What is bactofugation?

A) Process of removal of microorganisms from milk using centrifugal force B) Process of removal of yeast and fungi from milk using centrifugal force
C) Process of removal of microorganisms from milk using gravitational force D) Process of removal of yeast and mold from milk using gravitational force
 
Answer & Explanation Answer: A) Process of removal of microorganisms from milk using centrifugal force

Explanation: Bactofugation is the process of removal of microorganisms from milk using centrifugal force. It is a special form of separation of microbes, mainly spore formers.

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17
Q:

What is the temperature of ultra-pasteurization for milk?

A) 125 – 138°C B) 115 – 120°C
C) 63°C D) 63 – 65°C
 
Answer & Explanation Answer: C) 63°C

Explanation: Ultra-pasteurization temperature is 125 – 138°C for 2-4 seconds. Sterilization of milk in container is 115 – 120°C for 20-30 minutes. LTLT pasteurization of milk is 63°C for 30 minutes and for thermisation it is 63 – 65°C for 15 seconds.

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14
Q:

What is the chilling temperature of milk?

A) 1-2°C B) 3-4°C
C) 5-6°C D) 6-7°C
 
Answer & Explanation Answer: B) 3-4°C

Explanation: The chilling of milk is done by quick cooling of the raw milk to adequately low temperature. So that the growth of microbes present in milk is inactivated. In chilling process, the temperature of milk should be around 3 – 4°C.

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11
Q:

What happens when milk is sterilized?

A) Reduces the bacterial population B) Destroys spores
C) Impart color D) Impart flavor
 
Answer & Explanation Answer: B) Destroys spores

Explanation: Pasteurization is not similar to sterilization. Spores are not affected by the pasteurization process. But the sterilization process destroys the spores of the bacteria by inactivating them.

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