1. Which tube arrangement in a heat exchanger would facilitate highest heat transfer rate?
2. In the downcomer of a distillation column, the minimum recommended residence time is about __________ seconds.
3. In which of the following evaporators, steam is fed inside the tube while the liquor is outside the tube?
4. 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.
5. The ratio for the rate of washing to the final rate of filtration in a washing type of plate and frame filter is
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