During constant rate drying period, vaporisation rate per unit drying surface area _____________________?
Correct answer: C. Does not change with time
- A. Decreases with time
- B. Increases with time
- C. Does not change with time
- D. Does not affect the moisture content of the wet solid
Explanation
During the constant-rate period, the wet surface remains effectively saturated and evaporation is controlled by external heat and mass transfer, which stay approximately constant. Moisture content still decreases with time even though the vaporisation rate does not.
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
In which of the following unit operations, the selectivity is an important parameter ?
Flash distillation is suitable for separating the constituents of a binary system, which _____________________?
In case of an unsaturated mixture of gas and vapor, the percentage saturation is __________________ its relative saturation?
In a distillation column, with increase in the reflux ratio, the heat removed in the cooler ______________________?
The feed to fractionating column is changed from saturated vapour to saturated liquid. If the separation and reflux ratio remains unchanged, the number of ideal stages will______________________?
In most of the vacuum crystalliser, vacuum is generally produced by means of a_____________________?