In case of vertical tube evaporator, with increase in liquor level, the overall heat transfer co-efficient______________?
Correct answer: B. Decreases
- A. Increases
- B. Decreases
- C. Is not affected
- D. May increase or decrease; depends on the feed
Explanation
Raising the liquor level in a vertical-tube evaporator increases the liquid head and generally weakens circulation, so the overall heat-transfer coefficient decreases. Lower circulation reduces the renewal of heated liquid at the tube surface.
Report an error
The more specific you are, the faster it gets fixed. A source beats an opinion.
Prefer email? support@testustad.com
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.
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
Intermittent tube cleaning is possible to be done in case of a _____________ evaporator?
Overall heat transfer co-efficient for cooling of hydrocarbons by water is about_________________?
For small temperature difference, the heat transfer rate as per Newton's law of cooling is proportional to (where, Δt = excess temperature) ?
In evaporators, lowering the feed temperature_______________?
Shell side pressure drop in a shell and tube heat exchanger does not depend upon the_________________?
The most conducive surface for dropwise condensation to occur is the _____________ surface?