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?

The correct answer is B: 5.0. For reversible reactions, K = kf/kr = 0.1/0.02 = 5.0. This represents the ratio of forward to reverse rate constants at equilibrium

Which of the following is the SI unit of kinematic viscosity?

The correct answer is A: m²/s. Kinematic viscosity is dynamic viscosity divided by density. Its SI unit is m²/s (or Stokes in CGS, where 1 Stoke = 10⁻⁴ m²/s).

A spherical tank of diameter 1 m containing hot liquid at 90°C is placed in ambient air at 15°C. If h = 8 W/m²·K and k_insulation = 0.05 W/m·K with 50 mm insulation thickness, calculate the heat loss rate.

The correct answer is A: 112.4 W. Surface area A = 4πr² = 4π(0.5)² = 3.14 m². Convection resistance R_conv = 1/(h·A) = 1/(8×3.14) = 0.0398 K/W. Conduction resistance (spherical) can be neglected due to small thickness. Q = ΔT/(R_conv) = 75/0.67 ≈ 112 W

For parallel reactions A→B and A→C, the selectivity of B over C is defined as:

The correct answer is A: Rate of B formation/Rate of C formation. Selectivity = rate of desired product formation/rate of undesired product formation

In a wetted wall column for gas absorption, the liquid film thickness (δ) affects the mass transfer rate. Increasing δ will:

The correct answer is B: Decrease the mass transfer rate. The liquid phase mass transfer coefficient k_L is inversely related to film thickness: k_L = D_AB/δ. Increasing δ decreases k_L and hence the mass transfer rate.

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Chemical Engineering
Chemical Reaction Engineering

Process design, thermodynamics, reactions

51 Q 5 Topics Take Mock Test

Difficulty: All Easy Medium Hard 51–51 of 51

Topics in Chemical Engineering

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

Q.51 Medium Chemical Reaction Engineering

Which type of reactor provides the best conversion for a reversible exothermic reaction?

A Batch reactor with cooling

B CSTR at high temperature

C Plug flow reactor with heat removal

D Fixed bed reactor without temperature control

Correct Answer: C. Plug flow reactor with heat removal

EXPLANATION

PFR with heat removal maintains optimal temperature profile and continuous removal of products, favoring forward reaction equilibrium

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