Online Chemical Engineering Test - Mass Transfer Test 1

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Total number of questions: 20.
Time allotted: 30 minutes.
Each question carries 1 mark; there are no negative marks.
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Which of the following remains constant during sensible cooling process ?

Specific humidity

Partial pressure of vapour

Both (a) and (b)

Neither (a) nor (b)

[#]

Pick out the correct statement.

Bound moisture is removed during constant rate drying period.

Free moisture is removed during falling rate drying period.

The sum of free moisture and equilibrium moisture in a solid is called the critical moisture.

The driving force for mass transfer in a wet solid is its free moisture content.

[#]

Under conditions of flooding in packed tower, the gas pressure drop

decreases rapidly

increases rapidly

remains constant

is maximum

[#]

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

1.5

-0.6

-1.5

0.6

[#]

Solvent extraction is the terminology applied to the liquid-liquid extraction, which is preferred for the separation of the components of liquids, when

extracting solvent is cheaply & abundantly available.

one of the liquid components is heat sensitive.

viscosity of liquid components is very high.

one of the liquid components has very high affinity towards the solvent.

[#]

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

- ve

+ ve

-1

[#]

Which of the following is an undesirable characteristic for the solvent used in gas absorption ?

Low vapor pressure

Low viscosity

High gas solubility

None of these

[#]

Which of the following equipments is not used for liquid dispersion ?

Wetted wall towers

Packed towers

Venturi scrubbers

Agitated vessels

[#]

Pick out the wrong statement.

Constant pressure distillation can not separate an azeotropic mixture.

Relative volatility of a binary mixture changes appreciably with the minor change in temperature.

The relative volatility of a binary mixture at azeotropic composition is unity.

Flash distillation is practised on wide spread scale in petroleum refinery.

[#]

10.

Pore size of the molecular seive 5A is __________ mm.

0.5

0.05

[#]

11.

__________ extractor is used for the concentration of radioactive nuclear waste.

Pulsed column

Seive plate

Mixer-settler

Ballman

[#]

12.

Dryer widely used in a textile industry is __________ dryer.

festoon

cylinder

conveyor

tunnel

[#]

13.

Selectivity of the solvent used in solvent extraction should be

> 1

< 1

[#]

14.

A liquid mixture contains 30% o-xylene, 60% p-xylene and 10%. m-xylene (all percentages in w/w). Which of the following statements would be true in respect of this mixture?

The mixture exhibits an azeotrope at 101.3 kPa.

The composition of the mixture, in percent by volume is: o-xylene 30, p-xylene 60. and m-xylene 10.

The composition of the mixture in mole percent is: o-xylene 30, p-xylene 60 and m-xyoene 10.

The mixture contain optical isomers.

[#]

15.

For the same process conditions, the reflux ratio of an unlagged distillation column

decreases in winter

increases in winter

increases in summer

none of these

[#]

16.

The relative humidity of air decreases in-spite of an increase in the absolute humidity, when the

temperature rises.

pressure rises.

temperature falls.

pressure falls.

[#]

17.

In rectifying section of a continuous distillation column, the

vapour is enriched with low boilers.

vapour is enriched with high boilers.

liquid is stripped of high boilers.

none of these.

[#]

18.

Molecular distillation is

high temperature distillation

for heat-sensitive materials

very low pressure distillation

both (b) and (c)

[#]

19.

Fractional solvent extraction

employs only one solvent

employs two solvents

results in low interfacial tension

none of these

[#]

20.

In case of unsaturated air

dew point < wet bulb temperature

wet bulb temperature < dry bulb temperature

both (a) and (b)

neither (a) not (b)

[#]

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Online Chemical Engineering Test - Mass Transfer Test 1

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