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Chemical Engineering MCQs: 8,342 practice questions with answer choices and available explanations. Page 222 of 557.

Chemical Engineering MCQs

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For turbulent flow (NRe > 2100) of low viscosity fluid (μ > 20cp) in steel pipes, the optimum inside pipe diameter is given by(where, Q = fluid flow rate, ft3/sec, ρ = fluid density, lb/ft3 μ = fluid viscosity, centipoise Di = optimum inside pipe diameter, inches)?

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A.Di, opt = 3.9 Q0.45 ρ0.13
B.Di, opt = 3 Q0.36. μ0.88
C.Di, opt = 4.7 Q0.36. μ3.2ρ0.13
D.Di, opt = 3.9 Q0.45. μ0.95
Explanation: The correct answer is Di, opt = 3.9 Q0.45 ρ0.13.

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The rate of the heterogeneous catalytic reaction A(g) + B(g) → C(g) is given by -rA = k.KA.pA.PB/(1 + KA.PA + Kc.pc), where KA and Kc are the adsorption equilibrium constants. The rate controlling step for this reaction is________?

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A.Surface reaction between A in the gas phase and absorbed B
B.Surface reaction between absorbed A and B in the gas phase
C.Absorption of A
D.Surface reaction between absorbed A and absorbed B
Explanation: The correct answer is Surface reaction between absorbed A and B in the gas phase.

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