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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 dispersion number of perfect mixed flow is__________________?
A 0
B > 150
C ∞
D < 2100
Correct Answer: ∞
Which of the following does not produce a change in the value of rate constant of a reaction ?
A Pressure
B Temperature
C Concentration and catalyst
D None of these
Correct Answer: Concentration and catalyst
For identical flow rate, feed composition and for elementary first order reactions, ‘N’ equal sized mixed reactors in series with a total volume ‘V’ gives the same conversion as a single plug flow reactor of volume ‘V’ for constant density systems. This is true, when the value of ‘N’ is ___________________?
A 1
B > 1
C ∞
D ≥ 1
Correct Answer: ∞
The energy of activation of a chemical reaction ?
A Is same as heat of reaction at constant pressure
B Is the minimum energy which the molecules must have before the reaction can take place
C Varies as fifth power of the temperature
D Both B. and C.
Correct Answer: Is the minimum energy which the molecules must have before the reaction can take place
If pore diffusion is the controlling step in a solid catalysed reaction, the catalyst___________________?
A Porosity is very important
B Porosity is of less importance
C Internal surface area is utilised efficiently
D None of these
Correct Answer: Porosity is of less importance
With the same reaction time, initial concentration and feed rate, the reaction 2A → B is carried out separately in CSTR and P.F. reactor of equal volumes. The conversion will be__________________?
A Higher in P.F. reactor
B Higher in CSTR
C Same in both the reactors
D Data insufficient; can’t be predicted
Correct Answer: Higher in P.F. reactor
Space time in flow reactor is____________________?
A Usually equal to the residence time
B The reciprocal of the space velocity
C A measure of its capacity
D Both A. and B.
Correct Answer: Both A. and B.
The rate of reaction does not decrease appreciably as the reaction proceeds in case of ______________ reactions?
A Autocatalytic
B Exothermic
C Endothermic
D Autothermal
Correct Answer: Autocatalytic
A space velocity of 5 hr-1 means that ___________________?
A Five reactor volumes of feed (at specified conditions) are being fed into the reactor per hour
B After every 5 hours, reactor is being filled with the feed
C Cent per cent conversion can be achieved in at least 5 hours
D A fixed conversion of a given batch of feed takes 5 hours
Correct Answer: Five reactor volumes of feed (at specified conditions) are being fed into the reactor per hour
The reaction A → B is conducted in an adiabatic plug flow reactor (PFR). Pure A at a concentration of 2 kmol/m3is fed to the reactor at the rate of 0.01 m3 /s and at a temperature of 500 K. If the exit conversion is 20%, then the exit temperature (in k) is (Data: Heat of reaction at 298 K = – 50000 kJ/ kmole of A reacted Heat capacities CPA = CPB = 100kJ/kmole. K (may be assumed to be independent of temperature)) ?
A 400
B 500
C 600
D 1000
Correct Answer: 600
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