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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.

‘If the catalyst pore size is small in comparison with the mean free path, collisions with the pore wall controls the process’. The diffusivity under this condition is called ‘Knudsen diffusivity’, which is affected by the_____________________?

A Pressure

B Temperature

C Both A. & B.

D Neither A. nor B.

Review Detailed Answer

Correct Answer: Temperature

In a semi-batch reactor __________________?

A Mixing takes place in axial direction only

B Velocity of reaction can be controlled

C Condition similar to plug flow reactor exists

D Residence time is constant

Review Detailed Answer

Correct Answer: Velocity of reaction can be controlled

A catalyst loses its activity due to__________________?

A Loss in surface area of the active component

B Agglomeration of metal particles caused by thermal sintering of the solid surface

C Covering of the catalytic active sites by a foreign substance

D All A., B. and C.

Review Detailed Answer

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

Transition state theory relates the above quantities as___________________?

A k ∝ e-E/RT

B k ∝ T.eE/RT

C k ∝ √T

D k ∝ T1.5

Review Detailed Answer

Correct Answer: k ∝ T.eE/RT

The dimensions of rate constant for reaction 3A → B are (l/gm mole)/min. Therefore the reaction order is______________________?

A 0

B 1

C 2

D 3

Review Detailed Answer

Correct Answer: 2

Second order consecutive irreversible reaction as shown in the bellow figure, were carried out in a constant volume isothermal batch reactor with different initial feed compositions. Reactor temperature was same in all the cases. In experiments where the ratio of concentration of B to that of A in the initial feed was less than 0.5, the concentration of B increased first, reached a maximum and then declined with time. However, for all experiments where this concentration ratio was 0.5 or above, concentration of B decreased monotonically with time right from the beginning. What is the ratio of the two rate constants (k1/k2) ?

A 1/4

B 1/2

C 2

D 4

Review Detailed Answer

Correct Answer: 1/4

The fractional volume change of the system for the isothermal gas phase reaction, A → 3B, between no conversion and complete conversion is___________________?

A 0.5

B 1

C 2

D 3

Review Detailed Answer

Correct Answer: 2

For the chemical reaction P → Q, it is found that the rate of reaction doubles as the concentration of ‘P’ is doubled. If the reaction rate is proportional to Cp n, then what is the value of ‘n’ for this chemical reaction ?

A 0

B 1

C 2

D 3

Review Detailed Answer

Correct Answer: 1

The rate constant of a chemical reaction decreases by decreasing the____________________?

A Pressure

B Concentration of reactants

C Temperature

D Duration of reaction

Review Detailed Answer

Correct Answer: Temperature

If CA is the quantity of reactants initially present, the quantity left after ‘n’ half periods will be equal to__________________?

A (CA/2)n

B (½)n CA

C (CA/2)1/n

D (CA)1/2n

Review Detailed Answer

Correct Answer: (½)n CA

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Chemical Engineering Mcqs 9594 MCQs [All-Courses]

All Topics 9594

All Topics 9594

‘If the catalyst pore size is small in comparison with the mean free path, collisions with the pore wall controls the process’. The diffusivity under this condition is called ‘Knudsen diffusivity’, which is affected by the_____________________?

In a semi-batch reactor __________________?

A catalyst loses its activity due to__________________?

Transition state theory relates the above quantities as___________________?

The dimensions of rate constant for reaction 3A → B are (l/gm mole)/min. Therefore the reaction order is______________________?

The fractional volume change of the system for the isothermal gas phase reaction, A → 3B, between no conversion and complete conversion is___________________?

For the chemical reaction P → Q, it is found that the rate of reaction doubles as the concentration of ‘P’ is doubled. If the reaction rate is proportional to Cp n, then what is the value of ‘n’ for this chemical reaction ?

The rate constant of a chemical reaction decreases by decreasing the____________________?

If CA is the quantity of reactants initially present, the quantity left after ‘n’ half periods will be equal to__________________?