Challenging Chemical Engineering Quiz: Test Your Expertise
Assess deep knowledge of reaction engineering, separation processes, and safety calculations through rigorous objective questions.
Quiz Questions
Answer all questions below and test your knowledge.
- 1
A first‑order plug‑flow reactor has a space time of 4 min and a rate constant of 0.15 min‑1. What is the conversion of reactant A?
- 2
A binary distillation column separating ethanol and water operates at total reflux. Using the McCabe‑Thiele method, the intersection of the operating line and equilibrium curve occurs at x = 0.25, y = 0.35. How many theoretical stages are required to achieve a distillate composition of 0.95 mole fraction ethanol?
- 3
In the reaction 2 A + 3 B → C, 0.5 mol of A reacts with 0.6 mol of B. Which reactant limits the reaction?
- 4
A gas flows through a packed bed of spheres 0.02 m in diameter. The bed porosity is 0.4, superficial velocity is 0.1 m s‑1, fluid density 1.2 kg m‑3, viscosity 1.8×10‑5 Pa·s. Using the Ergun equation, what is the pressure drop per meter?
- 5
A vessel contains a flammable mixture at 2 bar absolute and 350 K. The design relief pressure is 2.5 bar. Using the ISO 4126 method, which relief valve setting (in bar absolute) ensures the valve opens before the vessel exceeds its design pressure?
- 6
A heat exchanger has NTU = 2 and a heat‑capacity ratio C* = 0.5. What is its effectiveness?
- 7
Water flows through a 0.05 m diameter pipe at a flow rate of 0.00013 m³ s‑1. The fluid density is 998 kg m‑3 and viscosity 1.0×10‑3 Pa·s. What is the Reynolds number and the flow regime?
- 8
A continuous‑stirred‑tank reactor (CSTR) operates at steady state with a volumetric flow rate of 2 m³ h‑1 and a volume of 1 m³. The first‑order reaction rate constant is 0.5 h‑1. What is the residence time mean (τ) and the conversion?
- 9
In a shell‑and‑tube heat exchanger, the fouling resistance is estimated at 0.0002 m² K W‑1. Which of the following total thermal resistances (including fouling, convection inside, convection outside, and conduction through tube wall) is closest?
- 10
Estimate the adiabatic flame temperature for stoichiometric combustion of methane in air at 298 K, assuming constant specific heats: Cp,CH4 = 35 J mol‑1 K‑1, Cp,CO2 = 37, Cp,H2O(g)=34, Cp,N2=29, and neglect dissociation. What is the approximate flame temperature?
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