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1287. Double pipe heat exchangers are used

When heat transfer area required is very high
When heat transfer area required is very low, i.e (100-200 ft²)
Because it occupies less floor area
Because it is less costly
✅ The correct answer is option B.

1254. Multiple effect evaporators ar used to

Increase the steam economy & decrease the capacity
Increase the steam economy & the capacity
Decrease the steam economy & the capacity
Decrease the steam economy & increase the capacity
✅ The correct answer is option B.
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