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Chemical Engineering Mcqs 9594 MCQs [All-Courses]

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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.

All Topics  9594

Fluid flow in a real packed bed can be approximated as ________________ model?
A Plug flow
B Dispersion
C Mixed flow
D Tank in series
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)
Correct Answer: dXA/dt = k1 (1 – XA)
Three plug flow reactors (PFR’s) of 4, 5 & 6 m3 volumes are arranged in two branches as shown below in the figure. If the total feed rate is 300 tons/hr, then for the same conversion in each branch, the feed rate through branch II should be ______________ tons/hr ?
A 100
B 150
C 200
D 225
Correct Answer: 100
An irreversible first order reaction is being carried out in a CSTR and PFR of same volume. The liquid flow rates are same. The relative conversion will__________________?
A Be more in CSTR than in PFR
B Be more in PFR than in CSTR
C Be same in both cases
D Depend on the temperature
Correct Answer: Be more in PFR than in CSTR
For an ideal mixed flow reactor (CSTR), the exit age distribution E(t) is given by __________________?
A A Dirac delta function
B A step function
C A ramp function
D None of the above
Correct Answer: None of the above
In case of a P.F.R., there__________________________?
A May be lateral mixing of fluid
B Should not be any mixing along the flow path
C Both A. and B.
D Neither A. nor B.
Correct Answer: Both A. and B.
The rate of the reaction, X → Y, quadruples when the concentration of ‘X’ is doubled. The rate expression for the reaction is, r = K Cx n, the value of ‘n’ in this case will be_______________________?
A 0
B 1
C 2
D 3
Correct Answer: 2
The rate of a homogeneous reaction is a function of__________________?
A Temperature and pressure only
B Temperature and composition only
C Pressure and composition only
D All temperature, pressure and composition
Correct Answer: All temperature, pressure and composition
For series reaction, the relative yield__________________?
A Is always greater for plug-flow reactor than for the single CSTR of the same volume
B Statement in A. is wrong
C Decreases with increasing conversion
D Both A. and C. hold good
Correct Answer: Both A. and C. hold good
In autocatalytic reactions ?
A One of the reactants acts as a catalyst
B One of the products acts as a catalyst
C Catalysts have very high selectivity
D No catalyst is used
Correct Answer: One of the products acts as a catalyst
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