Lessing ring is formed by the addition of a partition across the centre of a raschig ring, which results in an area increase of about ______________ percent?
Correct answer: B. 20
- A. 5
- B. 20
- C. 35
- D. 55
Explanation
A partition in a Lessing ring adds internal contact surface without greatly increasing the packing volume. Its effective area is therefore about 20% greater than that of a plain Raschig ring.
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