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Mass Transfer Online Exam Quiz

Important questions about Mass Transfer. Mass Transfer MCQ questions with answers. Mass Transfer exam questions and answers for students and interviews.

Which of the following T-H diagram is valid for dehumidification operation ?

Options

A : a. A

B : b. B

C : c. C

D : d. D

If f = moles of vapour present per mole of feed, then the slope of feed line is (Mcabe-Thiele method)

Options

A : a. A

B : b. B

C : c. C

D : d. D

In gas-liquid contact operation, the number of ideal stages N is given by following equation. This is true when the stripping factor 'S' is

Options

A : a. S > 1

B : b. S < 1

C : c. S = 1

D : d. S = ?

The following equation is for

Options

A : a. steady state equimolar counter diffusion

B : b. Fick's first law of diffusion

C : c. steady state diffusion for stagnant case

D : d. liquid M.T.C. by penetration theory

Which of the following liquid temperature (T) Vs. vapor-gas mixture enthalpy (H) diagram is valid for humidification operation?

Options

A : a. A

B : b. B

C : c. C

D : d. D

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

Options

A : a. A

B : b. B

C : c. C

D : d. D

Which of the following is the correct ternery diagram for liquid-liquid extraction system comprising of two pairs partly soluble (e.g., chlorobenzene-water-methyl ethyl ketone system) ?

Options

A : a. A

B : b. B

C : c. C

D : d. D

The following expression is

Options

A : a. differential distillation equation

B : b. for NtoG in absorption for dilute mixture

C : c. slope of q-line in McCabe-Thiele method

D : d. for relative volatility

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

Options

A : a. increases

B : b. decreases

C : c. does not vary

D : d. may increase on decrease, depends on the system.

Separation of two or more components of a liquid solution can not be achieved by

Options

A : a. fractional crystallisation

B : b. liquid extraction

C : c. absorption

D : d. evaporation

Fenske's equation for determining the minimum number of theoretical stages in distillation column holds good, when the

Options

A : a. relative volatility is reasonably constant.

B : b. mixture (to be separated) shows negative deviation from ideality.

C : c. mixture (to be separated) shows positive deviation from ideality.

D : d. multicomponent distillation is involved.

When the temperature and humidity of air is low, we usually use __________ draft cooling tower.

Options

A : a. natural

B : b. forced

C : c. induced

D : d. none of these

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

Options

A : a. Heat gain or loss

B : b. Flow rate of entering liquid

C : c. Flow rate of gas

D : d. None of these

As the reflux ratio in a distillation coloumn is increased from the minimum, the

Options

A : a. slope of the operating line in stripping section decreases.

B : b. number of plates decreases very slowly first and then more and more rapidly.

C : c. total cost first decreases and then increases.

D : d. liquid flow increases while the vapor flow decreases for a system.

Mass transfer rate between two fluid phases does not necessarily depend on the __________ of the two phases.

Options

A : a. chemical properties

B : b. physical properties

C : c. degree of turbulence

D : d. interfacial area

Moisture contained by a substance in excess of the equilibrium moisture is called the __________ moisture.

Options

A : a. unbound

B : b. free

C : c. critical

D : d. bound

The equilibrium liquid composition compared to the vapor composition in case of azeotropic mixture is

Options

A : a. more

B : b. less

C : c. same

D : d. either more or less; depends on the system

Free flowing granular materials can be best dried in a __________ drier.

Options

A : a. rotary

B : b. cylinder

C : c. drun

D : d. freeze

In case of an ideal solution, the total vapor pressure varies __________ with the composition expressed as mole fraction,

Options

A : a. inversely

B : b. linearly

C : c. exponentially

D : d. none of these

Molarity is defined as the number of gm moles of solute per __________ of solvent.

Options

A : a. litre

B : b. kg

C : c. gm

D : d. c.c

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