In a multiple effect evaporator system having 'n' effects, the amount of water evaporated per unit surface area in approximately equal to _____________ times that in a single effect?
Correct answer: C. (1/n)th
- A. nth
- B. 0.5 nth
- C. (1/n)th
- D. 1.5 nth
Explanation
For a fixed total heating surface, adding effects divides the available surface among the effects, so evaporation per unit surface is approximately 1/n of that in a single effect. The main advantage of multiple effects is greater steam economy, not greater evaporation per unit area.
Report an error
The more specific you are, the faster it gets fixed. A source beats an opinion.
Prefer email? [email protected]
Practise Heat Transfer Operations
645 free Heat 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 Heat Transfer Operations questions
Ratio of tube length to shell diameter for a shell and tube heat exchanger is________________?
The average velocity in the tubes of a 1-4 heat exchanger is ______________ times that in 1-1 heat exchanger having the same size & number of tubes and operated at same liquid flow rate ?
_____________ heat exchanger is also known as 'hair pin type' exchanger?
Tubes are fixed to the tube sheet (a thick circular metallic plate) by the method of tube rolling and brazing (non-removable) or ferrule connection (removable). Thickness of the tube, sheet is normally ____________ the outside diameter of the tube but in no case it should be less than 22 mm (7/8″)?
In a shell and tube heat exchanger, the overall heat transfer co-efficient is proportional to the tube side (volumetric flow rate)0.8. This is valid, only when the ratio of the tube side film resistance to the total resistance is almost equal to____________________?
When one of the fluids is highly corrosive and has fouling tendency, it should_____________________?