7921. To maximise the formation of R in the simultaneous reaction A + B → R , rR = 2CA0.5.CB2 A + B → S , rS = 1.5 CA . CB We should have
Low CA, low CB
Low CA, high CB
High CA, low CB
High CA, high CB
✅ The correct answer is option B.
Chemical Engineering
Prepare with the best Chemical Engineering MCQs with answers and detailed explanations for exams and job tests. Our collection covers key topics such as chemical process calculations, thermodynamics, fluid mechanics, heat transfer, mass transfer, reaction engineering, instrumentation, and plant design. These Chemical Engineering multiple-choice questions are ideal for students, competitive exam aspirants, and professionals preparing for NTS, PPSC, FPSC, PEC exams, GATE, university entry tests, and job interviews. Practice online with updated Chemical Engineering MCQs to strengthen your concepts and improve technical problem-solving skills.
7922. Which of the following is not a dimension-less group used in catalysis ? (where, D = dispersion co-efficient, cm² /sec.D1 = diffusion co-efficient; cm²/sec L = length of the reactor, cm t = time, sec, v = volumetric flow rate, cm³/sec . V = volume, cm³.)
Reactor dispersion number (D/vL)
Reduced time (vt/V)
Thiele modulus (L√(k/D1)
None of these
✅ The correct answer is option D.
7923. An autothermal reactor is
Most suitable for a second order reaction
Most suitable for a reversible reaction
Completely self-supporting in its thermal energy requirements
Isothermal in nature
✅ The correct answer is option C.
7924. Transition state theory relates the above quantities as
K ∝ e-E/RT
K ∝ T.eE/RT
K ∝ √T
K ∝ T1.5
✅ The correct answer is option B.
7925. The rate constant of a reaction depends on the
Initial concentration of reactants
Time of reaction
Temperature of the system
Extent of reaction
✅ The correct answer is option C.
7926. The extent of a reaction is
Different for reactants and products
Dimensionless
Depends on the stoichiometric co-efficient
All of the above
✅ The correct answer is option D.
7928. Non-catalytic fluid-solid reactions are represented by __________ model.
Continuous reaction
Unreacted core
Both A and B
Neither A and B
✅ The correct answer is option C.
7929. N’ plug flow reactors in series with a total volume ‘V’ gives the same conversion as a single plug flow reactor of volume ‘V’ for __________ order reactions.
First
Second
Third
Any
✅ The correct answer is option D.
7930. Half life period of a chemical reaction is proportional to CA0-1 , if the reaction is of __________ order.
First
Zero
Second
Third
✅ The correct answer is option C.