Drying operation under vacuum is carried out to __________________?
Correct answer: B. Reduce drying temperature
- A. Dry those materials which have very high unbound moisture content
- B. Reduce drying temperature
- C. Increase drying temperature
- D. Dry materials having high bound moisture content
Explanation
Vacuum lowers the boiling point of moisture, allowing evaporation at a lower temperature. This is useful for heat-sensitive materials, whereas vacuum is not intended to increase the drying temperature.
Report an error
The more specific you are, the faster it gets fixed. A source beats an opinion.
Prefer email? [email protected]
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.
Discussion
Stuck on an option, or know a faster way to get there? Ask or explain it here.
No comments yet. Be the first to explain this one.
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
Sticky material can be dried in a ________________ dryer ?
The drying time between fixed moisture contents within the 'constant rate period' is proportional to (assuming that drying occurs from all surfaces of the solid) (where, T = thickness of the solid) ?
The minimum number of theoretical plates is required for achieving a given separation in distillation column with_________________?
At equilibrium the concentration of water in vapour phase (C*) in kg/m3 of air space and the amount of water (m) adsorbed per kg of dry silica gel are related by, C* = 0.0667m. To maintain dry conditions in a room of air space 100m3 containing 2.2 kg of water vapour initially, 10 kg of dry silica gel is kept in the room. The fraction of initial water remaining in the air space after a long time (during which the temperature is maintained constant) is_________________?
In a counter-current extractor, as the axial mixing increases, the extraction efficiency______________________?
In saturated gas, the__________________?