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Mass Transfer

Mass Transfer
Milk is dried usually in a __________ dryer.

Spray
Rotary
Tray
Freeze

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

78
None of these
50
100

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Mass Transfer
When a multistage tray tower uses a minimum reflux ratio, it implies

Minimum trays and minimum reboiler heat load
Minimum trays and maximum reboiler heat load
Infinite trays and maximum reboiler heat load
Infinite trays and minimum reboiler heat load

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Mass Transfer
Which of the following equipments is not used for gas dispersion?

Spray towers
Agitated vessels
Bubble cap tray towers
Perforated sieve tray towers

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Mass Transfer
Air at a particular humidity is heated in a furnace. The new dew point

Decreases
Remain unchanged
Increases
Depends on the extent of heating

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Mass Transfer
In continuous distillation, the internal reflux ratio (Ri) and the external reflux ratio (Re) are related as

Ri = Re
Ri = (1 - Re)/Re
Ri = Re/(1 - Re)
Ri = Re/(1 + Re)

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