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Chemical Engineering Mcqs 9594 MCQs [All-Courses]

Chemical Engineering MCQs designed for job test and interview preparation, particularly for fresh graduates, students, and candidates appearing in competitive exams. These multiple-choice questions cover important topics such as the fundamentals of chemical engineering, chemical processes, chemical reactions, process control, and instrumentation, along with other key concepts in the field.

In a first order reaction, the time required to reduce the concentration of reactant from 1 mole/litre to 0.5 mole/litre will be ______________ that required to reduce it from 10 moles/litre to 5 moles/litre in the same volume ?

A More than

B Less than

C Same as

D Data insufficient; can’t be predicted

Review Detailed Answer

Correct Answer: Same as

A first order reaction A → B occurs in an isothermal porous catalyst pellet of spherical shape. If the concentration of A at the centre of the pellet is much less than at the external surface, the process is limited by__________________?

A Diffusion within the pellet

B Reaction

C External mass transfer

D None of the above

Review Detailed Answer

Correct Answer: Diffusion within the pellet

The use of space time is preferred over the mean residence time in the design of a/an____________________?

A Batch reactor

B Ideal tubular-flow reactor

C Slurry reactor

D CSTR

Review Detailed Answer

Correct Answer: Ideal tubular-flow reactor

For a packed bed reactor; the presence of a long tail in the residence time distribution curve is an indication of ?

A Ideal plug flow

B Bypass

C Dead zone

D Channelling

Review Detailed Answer

Correct Answer: Dead zone

Overall rate of reaction in a heterogeneous catalytic reaction depends upon the mass and energy transfer from the fluid to solid surface and its rate of reaction is usually ________________ the concentration of catalyst, if it does not entail a chain mechanism?

A Proportional to

B Independent of

C Inversely proportional to

D Proportional to the square of

Review Detailed Answer

Correct Answer: Proportional to

Fractional conversion _________________ for an exothermic reversible chemical reaction, when the temperature is maximum?

A Increases

B Remains unchanged

C Decreases

D Unpredictable from the data

Review Detailed Answer

Correct Answer: Decreases

For identical flow rate and feed composition, X plug flow reactors (PER) in series with a total volume V gives the same conversion as single_______________?

A CSTR of volume V

B PFR of volume V

C CSTR of volume V/X

D PFR of volume V/X

Review Detailed Answer

Correct Answer: PFR of volume V

The irreversible reaction, X → Y, is the special case of the reversible reaction, X ⇌ Y, in which the _____________________?

A Equilibrium constant is infinite

B Fractional conversion of ‘A’ at equilibrium is unity

C Concentration of ‘A’ at equilibrium is zero

D All A., B. and C.

Review Detailed Answer

Correct Answer: All A., B. and C.

Half life period of decomposition of a liquid ‘A’ by irreversible first order reaction is 12 minutes. The time required for 75% conversion of ‘A’ is _____________ minutes?

A 18

B 24

C 6

D 12

Review Detailed Answer

Correct Answer: 24

The fractional volume change between no conversion and complete conversion, for the isothermal gas phase reaction, 2A → R, is___________________?

A 0.5

B -0.5

C 1

D 1.5

Review Detailed Answer

Correct Answer: 0.5

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Chemical Engineering Mcqs 9594 MCQs [All-Courses]

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All Topics 9594

In a first order reaction, the time required to reduce the concentration of reactant from 1 mole/litre to 0.5 mole/litre will be ______________ that required to reduce it from 10 moles/litre to 5 moles/litre in the same volume ?

A first order reaction A → B occurs in an isothermal porous catalyst pellet of spherical shape. If the concentration of A at the centre of the pellet is much less than at the external surface, the process is limited by__________________?

The use of space time is preferred over the mean residence time in the design of a/an____________________?

For a packed bed reactor; the presence of a long tail in the residence time distribution curve is an indication of ?

Overall rate of reaction in a heterogeneous catalytic reaction depends upon the mass and energy transfer from the fluid to solid surface and its rate of reaction is usually ________________ the concentration of catalyst, if it does not entail a chain mechanism?

Fractional conversion _________________ for an exothermic reversible chemical reaction, when the temperature is maximum?

For identical flow rate and feed composition, X plug flow reactors (PER) in series with a total volume V gives the same conversion as single_______________?

The irreversible reaction, X → Y, is the special case of the reversible reaction, X ⇌ Y, in which the _____________________?

Half life period of decomposition of a liquid ‘A’ by irreversible first order reaction is 12 minutes. The time required for 75% conversion of ‘A’ is _____________ minutes?

The fractional volume change between no conversion and complete conversion, for the isothermal gas phase reaction, 2A → R, is___________________?