Question

Compensated vacuum gas flushing is a ________ process.

(a) four-stage

(b) three-stage

(c) one-stage

(d) two-stage

This question was addressed to me during an interview.

I'd like to ask this question from Modified & Controlled Packaging Techniques topic in section Modern Packaging Techniques of Food Packaging Technology

Answer 1

Right choice is (d) two-stage

For explanation I would say: Compensated vacuum gas flushing is a two-stage process. The two stages are-

(i) Evacuation stage: The vacuum achieved is generally between 5 and 10 torr.

(ii) Gas flushing stage: the pack is flushed with the modified gas mix.