Category: Mass Transfer

At constant pressure, with increase of temperature, the dew point will ________________________?

Hamad Mass Transfer 11/05/2020

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A. Increase
B. Decrease
C. Remain unchanged
D. Increase/decrease; depends on the temperature

In distillation where q is defined as the moles of liquid flow in the stripping section per mole of feed introduced, for saturated liquid feed____________________?

Hamad Mass Transfer 10/05/2020

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A. q > 1
B. q < 1
C. q = 1
D. q = 0

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

Hamad Mass Transfer 08/05/2020

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A. Relative humidity
B. Partial pressure of vapour
C. Wet bulb temperature
D. None of these

Ion exchange process is similar to___________________?

Hamad Mass Transfer 07/05/2020

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A. Absorption
B. Adsorption
C. Extraction
D. Leaching

Which of the following is not a batch drier ?

Hamad Mass Transfer 06/05/2020

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A. Truck drier
B. Agitated pan drier
C. Fluidised bed drier
D. Vacuum shelf drier

The mass diffusivity, the thermal diffusivity and the eddy momentum diffusivity are same for, NPr = NSc = _________________?

Hamad Mass Transfer 06/05/2020

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A. 1
B. 0.5
C. 10
D. 0

A solid is being dried in the linear drying rate regime from moisture content Xo to XF. The drying rate is zero at X = 0 and the critical moisture content is the same as the initial moisture Xo. The drying time for M = (Ls/ARc) is (where, L = total mass of dry solid, A = total surface area for drying Rc = Constant maximum drying rate per unit area X = moisture content (in mass of water/mass of dry solids))_____________?

Hamad Mass Transfer 06/05/2020

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A. M(Xo – XF)
B. M(Xo/XF)
C. M ln(Xo/XF)
D. MXo ln(Xo/XF)

In case of non-ideal gases and liquids, the molal diffusivity ________________?

Hamad Mass Transfer 06/05/2020

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A. Varies inversely as the pressure
B. Varies directly as the pressure
C. Is independent of pressure
D. Is equal to the volumetric diffusivity