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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.

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

Fluid flow in a real packed bed can be approximated as ________________ model?

A Plug flow

B Dispersion

C Mixed flow

D Tank in series

Review Detailed Answer

Correct Answer: Dispersion

The first order gas phase reaction as shown in the bellow figure is conducted isothermally in batch mode. The rate of change of conversion with time is given by________________?

A dXA/dt = k1 (1 – XA)2 (1 + 2XA)

B dXA/dt = k1 (1 – XA) (1 + 0.5XA)

C dXA/dt = k1 (1 – XA)

D dXA/dt = k1 (1 – XA)/(1 + XA)

Review Detailed Answer

Correct Answer: dXA/dt = k1 (1 – XA)

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Chemical Engineering Mcqs 9594 MCQs [All-Courses]

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All Topics 9594

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__________________?

Fluid flow in a real packed bed can be approximated as ________________ model?

The first order gas phase reaction as shown in the bellow figure is conducted isothermally in batch mode. The rate of change of conversion with time is given by________________?