Online Chemical Engineering Test - Mass Transfer Test 2

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Total number of questions: 20.
Time allotted: 30 minutes.
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Drying operation under vacuum is carried out to

dry those materials which have very high unbound mositure content.

reduce drying temperature.

increase drying temperature.

dry materials having high bound moisture content.

[#]

__________ diffusion is used for separating the isotopes of methane.

Thermal

Pressure

Concentration

Force

[#]

The McCabe Δ L law states that the

molar heats of vaporisation of components are nearly equal.

linear crystal growth rate depends on the degree of supersaturation.

linear crystal growth rate does not depend on the crystal size.

linear crystal growth rate depends on the crystal size.

[#]

In case of a desorber (stripper), the

operating line always lies above the equilibrium curve.

operating line always lies below the equilibrium curve.

temperature remains unaffected.

temperature always increases.

[#]

In most of the mechanically agitated liquid-liquid extractors, baffles or horizontal compartmental plates are provided, which helps in

reducing the axial mixing.

increasing the rate of extraction.

maintaining the concentration difference between the two phases.

all 'a', 'b' & 'c'.

[#]

In gas-liquid contact operation, the number of ideal stages,

. This is true when the stripping factor 'S' is

S > 1

S < 1

S = 1

S = ∞

[#]

Which of the following is the most commonly used leaching solvent in vegetable oil industry ?

Phenol

Hexane

Furfurol

Liquid SO₂

[#]

The percentage humidity is less than the relative humidity only at __________ percent humidity.

zero

hundred

both zero and hundred

none of these

[#]

Moisture content of a substance when at equilibrium with a given partial pressure of the vapour is called the __________ moisture.

free

unbound

equilibrium

bound

[#]

10.

The main reason for dividing a tall packed tower into series of small towers is to

minimise the overall pressure drop.

avoid flooding.

reduce liquid hold up.

avoid channeling.

[#]

11.

Perforated plate towers are unique for solvent extraction because, they provide

higher contact area.

better contact of the phase.

repeated coalescence & redispersion of the drop phase.

none of these.

[#]

12.

Which of the following mixtures does not form an azeotrope at atmosheric pressure?

Water-alcohol

Methyl alcohol-acetone

Butyl acetate-water

None of these

[#]

13.

Molecular diffusivity of a liquid

increases with temperature.

decreases with temperature.

may increase or decrease with temperature.

is independent of temperature.

[#]

14.

Unsaturated air (with dry bulb temperature and dew point being 35°C and 18°C respectively) is passed through a water spray chamber maintained at 15°C. The air will be cooled

and humidified.

and dehumidified with increase in wet bulb temperature.

at the same relative humidity.

and dehumidified with decrease in wet bulb temperature.

[#]

15.

Can a cooling tower cool water below the wet bulb temperature of inlet air ?

yes

yes ; but height of cooling tower will be prohibitively high.

yes ; but the air flow rate should be excessively high.

[#]

16.

The suitable evaporator for concentration of foaming liquids is a __________ evaporator.

long tube

short tube

vacuum

falling film

[#]

17.

Components, having widely different boiling point in a binary mixture, can be separated using __________ distillation.

molecular

extractive

steam

simple

[#]

18.

In the absorption of ammonia in water, the main resistance to absorption is by the __________ phase.

liquid

gas

both (a) & (b)

neither (a) nor (b)

[#]

19.

Which of the following equipments is not used in liquid-liquid extraction ?

Pachuka tank

Agitated vessels

Centrifugal extractors

Packed towers

[#]

20.

Penetration theory states that the mass transfer co-coefficient is equal to (where, D_e is diffusivity and 't' is time)

(D_e.t)^1/2

(D_e/t)^1/2

(4D_e/πt)^1/2

(4D_e/t)

[#]

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Online Chemical Engineering Test - Mass Transfer Test 2

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