Chemical Engineering - MCQ Practice Questions

What is the primary advantage of using a plug flow reactor (PFR) over a continuous stirred tank reactor (CSTR) for reactions with activation energy greater than 50 kJ/mol?

In the Langmuir-Hinshelwood mechanism for catalytic reactions, what does the parameter K represent in the rate equation r = kK[A]/[1 + K[A]]?

In industrial practice, which method is most effective for controlling selectivity toward desired product in competitive parallel reactions?

The autocatalytic reaction A + B → 2B (where B is catalyst) exhibits which characteristic behavior?

In a fed-batch reactor for ester synthesis, maintaining the molar ratio of reactants at a specific value improves conversion. This strategy is known as:

In the design of a photocatalytic reactor for degradation of pollutants, which parameter has the most significant effect on reaction rate?

In a jacketed CSTR for an endothermic reaction, increasing the heat transfer area per unit volume of reactor primarily affects which parameter?

Which of the following best describes the role of the Damköhler number (Da) in reactor design?

For an isothermal CSTR processing a second-order reaction with inlet concentration C_A0 = 1 M and space time τ = 10 seconds, if k = 0.1 L/(mol·s), the outlet concentration is approximately:

In fermentation processes, the Monod equation describes microbial growth rate kinetics. Which substrate concentration results in 90% of maximum growth rate?

In a plug flow reactor (PFR) processing a first-order irreversible reaction with rate constant k = 0.5 min⁻¹, what is the space-time (τ) required to achieve 80% conversion?

A CSTR operating at steady state processes an exothermic reaction. If the inlet temperature increases by 10°C while maintaining constant coolant flow rate, which parameter is most likely to increase?

For a reversible reaction A ⇌ B with equilibrium constant Ke = 4, what is the maximum theoretical conversion in a batch reactor at equilibrium?

In a semi-batch reactor where reactant A is fed continuously to a batch of reactant B, which advantage is realized?

A series of 3 identical CSTRs in cascade is used to process a first-order reaction with overall conversion X = 90%. Which statement is true?

In a fixed-bed catalytic reactor, what is the primary cause of catalyst deactivation by sintering?

Which reactor configuration would be best suited for a fast, highly exothermic reaction where precise temperature control is critical?

In a membrane reactor for an equilibrium-limited reaction, what is the primary advantage?

The mean residence time in a reactor can be calculated from RTD data using:

In a tubular reactor with axial dispersion, increasing the Peclet number (Pe) results in: