Mechanism of moisture removal in case of freeze drying of food stuff is by ___________________?
Correct answer: B. Sublimation
- A. Evaporation
- B. Sublimation
- C. Dehydration
- D. Adsorption
Explanation
In freeze drying, water is first frozen and then removed under vacuum by direct conversion of ice to vapour. This solid-to-vapour change is sublimation, not ordinary evaporation.
Report an error
The more specific you are, the faster it gets fixed. A source beats an opinion.
Prefer email? support@testustad.com
Practise Mass Transfer Operations
669 free Mass Transfer Operations MCQs from Chemical Engineering, each with the correct answer and an explanation. Unlimited attempts, no account needed.
Exams that ask Chemical Engineering questions like this
Chemical Engineering is on this paper prepared for on TestUstad, and all of them draw the same bank, so this question is worth knowing for it.
More Mass Transfer Operations questions
When the mixture to be distilled has a very high boiling point and the product material is heat sensitive, the separation technique to be used is _______________ distillation?
In most of the mechanically agitated liquid-liquid extractors, baffles or horizontal compartmental plates are provided, which helps in_________________?
Which is not concerned directly with mass transfer ?
Flash distillation is _______________________?
When an unsaturated air-water mixture is heated at constant pressure, then ____________________ ?
Danckwerts developed the ____________________ theory?