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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

The concentration of A in a first order reaction, A → B, decreases_____________________?
A Linearly with time
B Exponentially with time
C Very abruptly towards the end of the reaction
D Logarithmically with time
Correct Answer: Exponentially with time
Time required for 50% decomposition of a liquid in an isothermal batch reactor following first order kinetics is 2 minutes. The time required for 75% decomposition will be about _______________ minutes?
A 3
B 4
C 6
D 10
Correct Answer: 4
The preferred reacting system for oxidation of o-xylene to phthalic anhydride is _____________________?
A Jacketed liquid phase CSTR
B Jacketed steam heated multitubular reactor
C Multitubular reactor with cooling
D Multistage multitubular reactor with interstage cooling
Correct Answer: Jacketed liquid phase CSTR
The gas phase reaction 2A ⇌ B is carried out in an isothermal plug flow reactor. The feed consists of 80 mole % A and 20 mole % inerts. If the conversion of A at the reactor exit is 50%, then CA/CA0 at the outlet of the reactor is _______________________?
A 2/3
B 5/8
C 1/3
D 3/8
Correct Answer: 5/8
Which of the following is the optimum operating condition for an exothermic reversible reaction taking place in a plug-flow reactor ?
A Temperature should be high in the beginning and decreased towards the end of the reaction
B Very low temperature should be used throughout the reaction
C Very high temperature should be used throughout the reaction
D None of these
Correct Answer: Temperature should be high in the beginning and decreased towards the end of the reaction
What is the order of a chemical reaction whose rate is deter-mined by the variation of one concentration term only ?
A Zero
B First
C Second
D Third
Correct Answer: First
When a catalyst increases the rate of chemical reaction, the rate constant_____________________?
A Decreases
B Increases
C Remain constant
D Become infinite
Correct Answer: Increases
A reaction which is catalysed by a base is catalysed by all substances which have a tendency to_______________________?
A Lose a proton
B Gain a proton
C Gain an electron
D None of these
Correct Answer: Gain a proton
If ΔG (free energy change) for a chemical reaction is very large and negative, then the reaction is_______________________?
A Not feasible
B Just feasible
C Very much feasible
D Unpredictable as ΔG is no measure of feasibility of a reaction
Correct Answer: Very much feasible
______________ catalytic reaction is involved in the thermal cracking of gas oil ?
A Homogeneous
B Non-Homogeneous
C Heterogeneous
D Non-Heterogeneous
Correct Answer: Homogeneous
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