HETP is numerically equal to HTU, only when the operating line ______________________?
Correct answer: B. And equilibrium lines are parallel
- A. Lies below the equilibrium line
- B. And equilibrium lines are parallel
- C. Lies above the equilibrium line
- D. Is far from the equilibrium line
Explanation
When the operating and equilibrium lines are parallel, the driving-force relationship remains uniform in the relevant graphical treatment, giving equal numerical values for HETP and HTU. A changing separation between the lines generally makes the two quantities differ.
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