# E-PolyLearning

 1. Overall distillation column efficiency for most of the refinery columns can be given by (for μ = 0.07 - 1.4 cp and relative volatility < 4) (where η = overall column efficiency, % μ = molal average viscosity of feed at average column temperature and pressure, cp Δp = pressure drop per tray, psi) a. A b. B c. C d. D

 2. For laminar flow (Nʀₑ < 2100) in steel pipe, the optimum inside pipe diameter is given by a. A b. B c. C d. D