Question

Today, milk that has been ultra pasteurized must have been heated at or above ______degrees F for at last ________ seconds.

(a) 191, 2

(b) 212, 3

(c) 260, 2

(d) 280, 2

I had been asked this question in final exam.

This interesting question is from Regulations in chapter Regulations of Dairy Engineering

Answer 1

The correct choice is (d) 280, 2

For explanation I would say: Ultra Pasteurization (UP), or Ultra High Temperature (UHT) pasteurization, is the process of heating milk to approximately 280 °F for just 2 seconds and then chilling it back down rapidly. The result is milk that’s 99.9% free from bacteria.