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Mass Transfer

Mass Transfer
Wet bulb and dry bulb temperatures becomes identical at __________ percent saturation curve.

78
50
None of these
100

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Mass Transfer
Which of the following adsorbant is used in the refinning of sugar?

Silica gel
Wood charcoal
Bone charcoal
Activated clay

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Mass Transfer
If f = moles of vapour present per mole of feed, then the slope of feed line is

(1 - f)/f
- f/(1 - f)
- 1/f
- (f - 1)/f

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Mass Transfer
For a binary mixture with low relative volatility, continuous rectification to get pure products will require

Less number of trays
Low reflux ratio
Small cross-section column
High reflux ratio

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Mass Transfer
In a packed bed absorption column, the channelling will be noted by the

Increase in flow rate
Sharp drop in pressure drop
None of these
Sharp rise in pressure drop

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Mass Transfer
In distillation column design, the McCabe-Thiele procedure is inadequate and a Ponchan-Savarit procedure is needed, when

The latent heat of vaporisation of the more and less volatile components are greatly different
A total condenser is used
Saturated feed is not used
An azeotrope forms

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