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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

Following isothermal kinetic data are obtained in a basket type of mixed flow reactor for a porous catalyst. Determine the role of pore diffusion and external mass transfer processes ?
A Strong pore diffusion control and mass transfer not controlling
B Both pore diffusion and mass transfer not controlling
C Both pore diffusion and mass transfer controlling
D Mass transfer controlling
Correct Answer: Strong pore diffusion control and mass transfer not controlling
A second order liquid phase reaction, A → B, is carried out in a mixed flow reactor operated in semi batch mode (no exit stream). The reactant A at concentration CAF is fed to the reactor at a volumetric flow rate of F. The volume of the reacting mixture is V and the density of the liquid mixture is constant. The mass balance for A is_______________________?
A d(VCA)/dt = -F (CAF – CA) – kCA2V
B d(VCA)/dt = F (CAF – CA) – kCA2V
C d(VCA)/dt = -FCA – kCA2V
D d(VCA)/dt = FCAF – kCA2V
Correct Answer: d(VCA)/dt = FCAF – kCA2V
For a first order isothermal chemical reaction in a porous catalyst, the effectiveness factor is 0.3. The effectiveness factor will increase if the____________________?
A Catalyst size is reduced or the catalyst diffusivity is reduced
B Catalyst size is reduced or the catalyst diffusivity is increased
C Catalyst size is increased or the catalyst diffusivity is reduced
D Catalyst size is increased or the catalyst diffusivity is increased
Correct Answer: Catalyst size is reduced or the catalyst diffusivity is increased
Batch process is preferred over continuous process, when the___________________?
A Product yields and quality cannot be achieved in continuous process, because of long
B Sales demand of product is not steady
C Same equipment cannot be used for several processes of the same nature
D All A., B. & C.
Correct Answer: All A., B. & C.
Rate of a chemical reaction is not affected by the____________________?
A Catalyst
B Temperature
C Reactant’s concentration
D Number of molecules of reactants taking part in the reaction
Correct Answer: Number of molecules of reactants taking part in the reaction
On application of pressure to the equilibrium system, ice ⇌ water; which of the following phenomenon will occur ?
A Water will evaporate
B Equilibrium will not be attained
C More ice will be formed
D More water will be formed
Correct Answer: More water will be formed
B.E.T. method can be used to determine the ___________________ of a porous catalyst?
A Solid density
B Pore volume
C Surface area
D All A., B. and C.
Correct Answer: Surface area
In an exothermic reaction, the energy of the reacting substances as compared to that of products is____________________?
A More
B Less
C Same
D Either A. or B., depends on order of reaction
Correct Answer: More
Semibatch reactor is preferred, when a/an__________________?
A A highly exothermic reaction is to be controlled
B Undesirable side reaction (at high concentration of one of the reactants) is to be avoided
C A gas is to be reacted with liquid (e.g. hydrogenation of fat)
D All A., B., and C.
Correct Answer: All A., B., and C.
The half life period ‘t’ of a zero order reaction as shown in the bellow figure, is equal to_________________?
A CA0/2K
B CA0/K
C 0.693/K
D 1/K
Correct Answer: CA0/2K
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