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Mass Transfer

Mass Transfer
The unit of volumetric diffusivity is

Cm²/sec
Cm³/sec
Cm/sec
Cm²/seC₂

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Mass Transfer
The dimension of diffusivity is same as that of the

Velocity head
Molal concentration
Kinematic viscosity
Density

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Mass Transfer
When both the fluids flow concurrently in an absorber, the slope of the operating line is

+ ve
1
-1
- ve

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

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

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Mass Transfer
The surface renewal frequency in Danckwerts model of mass transfer is given by (KL: mass transfer co-efficient)

KL².DA
KL²/DA
KL/DA²
√(KL².DA)

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

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

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