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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

Which of the following is used for calcination of limestone and dolomite in industrial practice?
A Fluidised bed reactor
B Moving bed reactor
C Fixed bed reactor
D None of these
Correct Answer: Moving bed reactor
A chemical reaction is of zero order, when the reaction rate is (where, CA = concentration of reactant) ?
A ∝ CA
B ∝ 1/CA
C Independent of temperature
D None of these
Correct Answer: None of these
According to the ‘law of mass action’, the rate of reaction is directly proportional to the__________________?
A Equilibrium constant
B Volume of the reaction vessel
C Nature of the reactants
D Molar concentration of the reactants
Correct Answer: Molar concentration of the reactants
In a chemical reaction as shown in the bellow figure, it is observed that the (i) Rate of formation of ‘P’ is doubled on doubling the concentration of ‘X’ (ii) Rate of formation of ‘P’ is quadrupled on doubling the concentration of ‘Y’ (iii) Doubling the concentration of ‘Z’ does not affect the rate of formation of ‘P’ What is the order of the above chemical reaction ?
A Zeroth order
B First order
C Second order
D Third order
Correct Answer: Third order
With an increase in pressure in gaseous phase chemical reactions, the fractional conversion ______________ when the number of moles decreases?
A Increases
B Decreases
C Remain unaffected
D Unpredictable from the data
Correct Answer: Increases
A liquid phase reaction is to be carried out under isothermal conditions. The reaction rate as a function of conversion has been determined experimentally and is shown in the figure given below. What choice of reactor or combination of reactors will require the minimum overall reactor volume, if a conversion of 0.9 is desired ?
A CSTR followed by a PFR
B PFR followed by a CSTR
C CSTR followed by a PFR followed by a CSTR
D PFR followed by a CSTR followed by a PFR
Correct Answer: CSTR followed by a PFR
What is the order of chemical reaction as shown in the bellow figure, if it is found that the reaction rate doubles on doubling the concentration of B and also the reaction rate doubles when the concentrations of both A & B were doubled and quadrupled when the concentrations of both B & C were doubled ?
A 1
B 2
C 3
D 4
Correct Answer: 2
For the reaction, A + B → 2B + C,___________________?
A rA = rB
B rA = -rB
C rA = 2rB
D rA = rB/2
Correct Answer: rA = -rB
The reaction rate constants at two different temperatures T1 and T2 are related by _________________?
A ln (k2/k1) = (E/R) (1/T2 – 1/T1)
B ln (k2/k1) = (E/R) (1/T1 – 1/T2)
C exp (k2/k1) = (E/R) (1/T2 – 1/T1)
D exp (k2/k1) = (E/R) (1/T1 – 1/T2)
Correct Answer: ln (k2/k1) = (E/R) (1/T1 – 1/T2)
The size of plug flow reactor (PFR) for all positive reaction orders and for any given duty, is _____________________ that of mixed reactor?
A Greater than
B Equal to
C Smaller than
D Unpredictable from the data
Correct Answer: Smaller than
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