Free FE Chemical Practice Questions
15 free practice questions with detailed solutions covering key FE Chemical exam domains
These questions cover thermodynamics, fluid mechanics, heat transfer, material balances, chemistry, and more. Each includes a step-by-step solution.
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A standard normal distribution has μ = 100 and σ = 10. What is the z-score for x = 110?
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Answer: A
z = (x - μ)/σ = (110 - 100)/10 = 1.0.
A 10 kg mass accelerates at 2 m/s². What is the net force?
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Answer: A
Newton's 2nd law: F = ma = 10(2) = 20 N.
A material has Young's modulus E = 200 GPa and strain ε = 0.001. What is the stress?
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Answer: A
Hooke's law: σ = Eε = 200 × 10³ MPa × 0.001 = 200 MPa.
What is the pH of a 0.001 M HCl solution?
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Answer: A
HCl is a strong acid, fully dissociates. [H⁺] = 0.001 M = 10⁻³. pH = -log(10⁻³) = 3.
Water (ρ = 1000 kg/m³, μ = 0.001 Pa·s) flows at 1.0 m/s through a 50 mm pipe. What is the Reynolds number?
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Answer: A
Re = ρVD/μ = 1000(1.0)(0.050)/0.001 = 50,000. This is turbulent flow.
A Carnot engine operates between 600 K and 300 K. What is the maximum thermal efficiency?
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Answer: A
η_Carnot = 1 - Tc/Th = 1 - 300/600 = 0.50 = 50%.
A feed of 1000 kg/h enters a separator. Top product is 400 kg/h at 80% A. Bottom is 600 kg/h. What is the mass fraction of A in the bottom?
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Answer: A
Mass balance on A: 1000x_F = 400(0.80) + 600(x_B). If feed is 60% A: 600 = 320 + 600x_B → x_B = 280/600 = 0.467.
A flat wall (k = 2 W/(m·K), thickness 0.1 m) has surfaces at 100°C and 20°C. What is the heat flux?
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Answer: A
q = k·ΔT/L = 2(100-20)/0.1 = 2(80)/0.1 = 1,600 W/m².
What is the present worth of $5,000 received 5 years from now at i = 10%?
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Answer: A
P = F/(1+i)ⁿ = 5000/(1.10)⁵ = 5000/1.6105 = $3,105.
For an ideal gas at constant pressure, 2 moles are heated from 300 K to 400 K. Cp = 29 J/(mol·K). What is ΔH?
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Answer: A
ΔH = nCpΔT = 2(29)(400-300) = 2(29)(100) = 5,800 J.
Water flows through a pipe that narrows from 100 mm to 50 mm diameter. If inlet velocity is 2 m/s, what is the outlet velocity?
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Answer: A
Continuity: A₁V₁ = A₂V₂. V₂ = V₁(D₁/D₂)² = 2(100/50)² = 2(4) = 8 m/s.
Balance the reaction: _Fe + _O₂ → _Fe₂O₃. The coefficient for Fe is:
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Answer: A
4Fe + 3O₂ → 2Fe₂O₃. Iron coefficient = 4.
Which corrosion mechanism occurs when two dissimilar metals are in electrical contact in an electrolyte?
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Answer: A
Galvanic corrosion occurs between dissimilar metals with different electrode potentials in an electrolyte. The more anodic metal corrodes preferentially.
Equipment cost $80,000 in 2018 (CEPCI = 603). Estimate cost in 2024 (CEPCI = 800).
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Answer: A
Cost₂ = Cost₁ × (Index₂/Index₁) = 80,000 × (800/603) = 80,000 × 1.327 = $106,100.
A 5 kg object is lifted 10 m. How much work is done against gravity? (g = 9.81 m/s²)
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Answer: A
W = mgh = 5(9.81)(10) = 490.5 J.
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