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

The correct answer is C: Reaction rate and operating temperature stability. Increased heat transfer area improves heat supply rate for endothermic reactions, allowing higher operating temperatures with better temperature control and stability.

The Maxwell relation that can be derived from Gibbs free energy is:

The correct answer is B: (∂S/∂P)ₜ = -(∂V/∂T)ₚ. From dG = -SdT + VdP, the Maxwell relation is (∂S/∂P)ₜ = -(∂V/∂T)ₚ. This relates entropy-pressure change to volume-temperature change.

A pharmaceutical company is designing an absorption tower for NH₃ removal from air using H₂SO₄ solution. The Henry's law constant for NH₃ at 25°C is very small. What does this indicate about the system?

The correct answer is A: Gas phase controls the mass transfer. A small Henry's law constant (H) for NH₃ indicates high solubility in the liquid phase. Since 1/K_L = 1/k_L + H/k_G, a small H means the gas phase resistance dominates.

Which process is represented by a horizontal line on a T-S (Temperature-Entropy) diagram?

The correct answer is C: Isothermal process. On a T-S diagram, horizontal line means constant temperature (T = const), which is an isothermal process. A vertical line would represent isentropic process (S = const).

In a once-through steam generator (OTSG) for heat recovery, the effectiveness-NTU relation for counterflow is ε = 1 - exp(-NTU(1-C_r))/(1-C_r·exp(-NTU(1-C_r))) where C_r = C_min/C_max. When C_r = 1, this simplifies to:

The correct answer is A: ε = NTU/(1 + NTU). For C_r = 1 (equal capacity rates), counterflow relation simplifies to ε = NTU/(1 + NTU), same as parallel flow.

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Chemical Engineering
Chemical Reaction Engineering

Process design, thermodynamics, reactions

23 Q 5 Topics Take Mock Test

Difficulty: All Easy Medium Hard 21–23 of 23

Topics in Chemical Engineering

All Mass Transfer 100 Heat Transfer 100 Fluid Mechanics 100 Chemical Reaction Engineering 100 Thermodynamics 97

Q.21 Easy Chemical Reaction Engineering

Which statement is correct about the residence time distribution (RTD) in an ideal plug flow reactor?

A All molecules spend different residence times

B All molecules spend the same residence time τ

C RTD follows Gaussian distribution

D RTD is exponential

Correct Answer: B. All molecules spend the same residence time τ

EXPLANATION

In ideal PFR, E(t) = δ(t-τ), meaning all molecules have identical residence time equal to τ

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Q.22 Easy Chemical Reaction Engineering

For a zero-order reaction, the integrated rate law is:

A [A] = [A]₀ - kt

B ln[A] = ln[A]₀ - kt

C 1/[A] = 1/[A]₀ + kt

D [A] = [A]₀e^(-kt)

Correct Answer: A. [A] = [A]₀ - kt

EXPLANATION

Zero-order integrated rate law: [A] = [A]₀ - kt, linear with time

Test

Q.23 Easy Chemical Reaction Engineering

A first-order reaction has a rate constant of 0.693 min⁻¹. What is its half-life?

A 1 minute

B 0.693 minutes

C 2 minutes

D 0.5 minutes

Correct Answer: A. 1 minute

EXPLANATION

For first-order reactions, t₁/₂ = 0.693/k = 0.693/0.693 = 1 minute

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