Chemical Engineering - MCQ Practice Questions

In a reversible elementary reaction A ⇌ B with forward rate constant kf = 0.1 s⁻¹ and reverse rate constant kr = 0.02 s⁻¹, what is the equilibrium constant K?

Which catalyst property is most important for industrial applications requiring high selectivity in parallel reactions?

For an exothermic reaction, operating a CSTR at higher conversion requires:

In industrial polymerization reactions, what is the primary role of chain termination reactions?

For a reaction A + B → C where both reactants are supplied in stoichiometric ratio, if reaction order with respect to A is 1 and B is 1, and initial concentrations are each 2 mol/L, the integrated rate law shows conversion X varies as:

Which of the following statements about residence time distribution (RTD) in reactors is incorrect?

For a first-order consecutive reaction A → B → C where k₁ = 0.1 min⁻¹ and k₂ = 0.05 min⁻¹, the maximum concentration of intermediate B occurs at approximately:

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?