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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

Pick out the wrong statement ?
A Chemical reactions with high activation energy are very temperature sensitive
B A flat velocity profile exists in a plug flow reactor
C The residence time for all the elements of fluid in case of a P.F.R. need not be same
D Half life of a reaction increases with increased initial concentration for reaction orders more
Correct Answer: The residence time for all the elements of fluid in case of a P.F.R. need not be same
There is no correspondence between stoichiometric and the rate equation in case of a/an _____________ reaction?
A Elementary
B Multiple
C Autocatalytic
D Non-elementary
Correct Answer: Non-elementary
Specific rate constant for a second order reaction__________________?
A Is independent of temperature
B Varies with temperature
C Depends on the nature of the reactants
D Both B. and C.
Correct Answer: Both B. and C.
A spherical porous catalyst particle of radius R is subjected to reactant A which reacts to form B by a zero order surface reaction A → B. Film mass transfer resistance is negligible and pore diffusion of A is rate controlling. The effectiveness factor of the catalyst is reported as 7/8. Which of the following statement is true?
A Inner catalyst core of radius R/8 does not participate in reaction
B Inner catalyst core of radius R/2 does not participate in reaction
C Inner catalyst core of radius 7R/8 does not participate in reaction
D Effectiveness factor for a zero order reaction cannot be 7/8 as it must always be 1
Correct Answer: Inner catalyst core of radius R/8 does not participate in reaction
If the time required to complete a definite fraction of reaction varies inversely as the concentration of the reactants, then the order of reaction is________________?
A 1
B 2
C 3
D 4
Correct Answer: 2
Velocity of a reaction depends upon the_________________?
A Nature of the reactants
B Concentration of the reactants
C Temperature at which the reaction is carried
D All A., B. and C.
Correct Answer: All A., B. and C.
From among the following, choose one which is not an exothermic process ?
A Methanol synthesis
B Catalytic cracking
C Ammonia synthesis
D Oxidation of sulphur
Correct Answer: Catalytic cracking
A batch adiabatic reactor at an initial temperature of 373°K is being used for the reaction, A → B. Assume the heat of reaction is – 1kJ/mole at 373°K and heat capacity of both A and B to be constant and equal to 50J/mole.K. The temperature rise after a conversion of 0.5 will be ____________?
A 5°C
B 10°C
C 20°C
D 100°C
Correct Answer: 10°C
The most unsuitable reactor for carrying out reactions in which high reactant concentration favours high yields is________________________?
A Backmix reactor
B Plug flow reactor
C Series of CSTR
D PFR in series
Correct Answer: Backmix reactor
Pure ethanol vapor is fed to a reactor packed with alumina catalyst, at the rate of 100 kmole / hr. The reactor products comprise: ethylene: 95 kmole / hr, water vapour: 97.5 k mole / hr and diethyl ether: 2.5 kmole/hr. The reactions occuring can be represented by: C2H5OH → C2H4 + H2O 2C2H5OH → C2H5 – O – C2H5 + H2O The percent conversion of ethanol in the reactor is________________?
A 100
B 97.5
C 95
D 2.5
Correct Answer: 100
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