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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.

A chemical reaction occurs, when the energy of the reacting molecules is ________________ the activation energy of reaction?

A Less than

B Equal to

C More than

D Equal to or more than

Review Detailed Answer

Correct Answer: Equal to

For a _____________ order reaction, the units of rate constant and rate of reaction are the same ?

A Zero

B First

C Second

D Fractional

Review Detailed Answer

Correct Answer: Zero

The conversion for a first order liquid phase reaction. A → B in a CSTR is 50%. If another CSTR of the same volume is connected in series, then the % conversion at the exit of the second reactor will be_____________________?

A 60

B 75

C 90

D 100

Review Detailed Answer

Correct Answer: 75

For the same residence time, which one will give the maximum conversion ?

A Single stirred tank (v = 5 litres)

B Two stirred tank (each of 2.5 litres) in series

C Stirred tank followed by tubular flow reactor (each of 2.5 litres)

D Single tubular flow reactor (v = 5 litres)

Review Detailed Answer

Correct Answer: Single tubular flow reactor (v = 5 litres)

The effectiveness factor for large value of Thiele modulus [L√(K/D1)] of a solid catalysed first order reaction is equal to (where, L = length of the reactor, cm, D1 = diffusion co-efficient, cm2/second) ?

A L √(K/D1)

B 1/[L√(K/D1)]

C 1

D ∞

Review Detailed Answer

Correct Answer: 1/[L√(K/D1)]

‘Unreacted core model’ represents the reaction involving ______________________?

A Combustion of coal particles

B Roasting of sulphide ores

C Manufacture of carbon disulphide from elements

D None of these

Review Detailed Answer

Correct Answer: Roasting of sulphide ores

The value of Steric factor ‘P’ in the equation k = PZeE/RT usually ranges from ______________________?

A 1.0 to 10-8

B 1.1 to 102

C 0.1 to 0.9

D None of these

Review Detailed Answer

Correct Answer: 1.0 to 10-8

Half life period of a first order irreversible reaction A → B is ______________________?

A k/2

B ln k/2

C ln 2/k

D ln 0.5/k

Review Detailed Answer

Correct Answer: ln 2/k

A stirred tank reactor compared to tubular-flow reactor provides____________________?

A More uniform operating conditions

B Permits operation at the optimum temperature for a long reaction time

C Higher overall selectivity for a first order consecutive reaction

D All A., B. and C.

Review Detailed Answer

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

The rate of an autocatalytic reaction as shown in the bellow figure, is given by – rA = k . CA . CB. In this case, the__________________?

A Plot of – rA Vs CA is a straight line with slope k

B Plot of – rA Vs CA is a hyperbola

C Rate of disappearance of reactant A is maximum, where CA = CB

D Both B & C

Review Detailed Answer

Correct Answer: Both B & C

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Chemical Engineering Mcqs 9594 MCQs [All-Courses]

All Topics 9594

All Topics 9594

A chemical reaction occurs, when the energy of the reacting molecules is ________________ the activation energy of reaction?

For a _____________ order reaction, the units of rate constant and rate of reaction are the same ?

The conversion for a first order liquid phase reaction. A → B in a CSTR is 50%. If another CSTR of the same volume is connected in series, then the % conversion at the exit of the second reactor will be_____________________?

For the same residence time, which one will give the maximum conversion ?

The effectiveness factor for large value of Thiele modulus [L√(K/D1)] of a solid catalysed first order reaction is equal to (where, L = length of the reactor, cm, D1 = diffusion co-efficient, cm2/second) ?

‘Unreacted core model’ represents the reaction involving ______________________?

The value of Steric factor ‘P’ in the equation k = PZeE/RT usually ranges from ______________________?

Half life period of a first order irreversible reaction A → B is ______________________?

A stirred tank reactor compared to tubular-flow reactor provides____________________?

The rate of an autocatalytic reaction as shown in the bellow figure, is given by – rA = k . CA . CB. In this case, the__________________?