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Mass Transfer

Mass Transfer
For continuous drying of grannular or crystalline material, the dryer used is the __________ dryer.

Tray
Tunnel
Rotary
None of these

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Mass Transfer
For __________ drying, the effects of velocity, temperature and humidity of the gas and the thickness of the solid are the same.

Neither A nor B
Constant rate
Unsaturated surface
Both A & B

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Mass Transfer
Which of the following remains constant during evaporative cooling process with recirculated water supply?

Wet bulb temperature
Partial pressure of vapour
None of these
Relative humidity

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Mass Transfer
Unit of molal diffusivity is

Cm²/sec gm . mole
Gm moles/cm. sec
Gm moles/cm². sec
Gm moles/cm² . sec

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

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

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Mass Transfer
As the reflux ratio increases, the slope of the operating line for rectifying section

Remains constant
Decreases
Data insufficient, cannot be predicted
Increases

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