Allied & ICAR Exam Bank • ALLIED_0994
MCQ • 1 Mark
Section 7: Dairy and Food Engineering
Thermal Processing and Sterilization
Subtopic: Pasteurization and Sterilization
Question Statement:
In continuous HTST milk pasteurizers, the regeneration section recovers heat by transferring thermal energy from:
Options:
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(A) Hot pasteurized milk exiting the holding tube to incoming cold raw milk
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(B) Boiler flue gases directly to milk
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(C) Ice water to boiler feedwater
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(D) Exhaust steam to cooling tower
Step-by-Step Solution & Explanation
Hot pasteurized milk ($72^\circ\text{C}$) preheats incoming cold raw milk ($4^\circ\text{C}$) while concurrently precooling itself, achieving heat regeneration efficiencies exceeding $90-95\%$, drastically slashing boiler fuel and chiller loads.
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