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Mass Transfer

Mass Transfer
In a binary distillation column, if the feed contains 40 mole % vapour, the q line will have a slope of

-1.5
1.5
-0.6
0.6

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Mass Transfer
Which of the following employs an accessory known as 'drift eliminator' ?

Mechanical draft cooling tower
Rotating disc contactor
Rotary dryer
Multiple effect evaporator

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Mass Transfer
In batch distillation with constant reflux, overhead product composition __________ with time.

May increase on decrease, depends on the system
Does not vary
Increases
Decreases

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Mass Transfer
Which of the following quantities need not be fixed before starting the design of a co-current absorber?

None of the listed here
Heat gain or loss
Flow rate of entering liquid
Flow rate of gas

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Mass Transfer
(NSh/NRe.NSc) is termed in mass transfer operation as the

Stanton number
Momentum diffusivity
Peclet number
Thermal diffusivity

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Mass Transfer
In case of non-ideal gases and liquids, the molal diffusivity

Is independent of pressure
Varies directly as the pressure
Varies inversely as the pressure
Is equal to the volumetric diffusivity

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