ThermoConcepts1a - ConcepTests in Chemical Engineering...

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Unformatted text preview: ConcepTests in Chemical Engineering Thermodynamics Note: Slides marked with JLF were adapted from the ConcepTests of John L. Falconer, U. Colorado. Cf. Chem. Eng. Ed. 2004,2007 1.3 What causes an azeotrope? A. The components cant be distilled. B. The components have similar boiling temperatures. C.The components like each other in the extreme. D.The components dislike each other in the extreme. Day1 Review 1.4 Whats the difference between a chemist and a chemical engineer? A. Engineers like numbers. B. About 20k$/yr. C.Engineers care more about profits. D.Engineers ask, How does it work? Day1 Review 1.1 What is temperature? A. Hotness. B. A measure of heat. C.A measure of kinetic energy. D.What a thermometer says. Day2 Preview 1.2 The picture below represents hard spheres colliding in a planar box (like an air hockey table). Which represents the area of the box that should be used to compute density? A. The blue area. B. The area inside the green (and grey) bars. C.None of the above. Day1 Review 2.1. Which of the following represents an ideal gas? (a) (b) (c) (d)-10-5 5 10 0.2 0.4 0.6 0.8 r (nm) u/k (K)-10-5 5 10 0.2 0.4 0.6 0.8 r (nm)-40-20 20 40 60 0.2 0.4 0.6 0.8 r (nm)- 1.5-1-0.5 0.5 1 0 1 2 Day2 Review 2.2 Which is characteristic of a liquid relative to a vapor? A. Liquid molecules move slower. B. Liquid has a higher pressure. C.Liquid molecules collide more. D.The liquid has more energy. Day2 Review 2.3 For water at 375 C and 10 MPa, find the internal energy (kJ/kg). A. 2596.9 B. 2699.6 C.2766.0 D.2833.1 Day2 Review 2.4 The outlet from a turbine consists of steam at 100C and an entropy (S) of 7 kJ/kg-K. What is its quality? A. 5% B. 10% C.90% D.95% E. 100% Day2 Review 3.1 When running a turbine, you want to recover as much energy as work as possible. If the efficiency is, say, 75% then 25% of the possible work must be lost. The lost work must show up in the turbine outlet stream somehow, but how? A. Its pressure is relatively higher. B. Its velocity is relatively higher. C.Its temperature is relatively higher. D.Its enthalpy is relatively higher. Day1 Review 3.2 What causes the efficiency of a turbine to be less than 100%? A. Reversibility. B. Pressure gradient. C.Disorder. D.Stirring. Day3 Review 4.1 Two molecules are bouncing in 2D with molecular weight of 16g/mole. Their velocities (m/s) are given by: <555, -432>, < -555,432>. Estimate the temperature in the box (K). . 7 0 0 A. 8 0 0 B. 9 0 0 C. 1 0 0 0 Day4 begin 2 kg gas vacuum 1 kg gas vacuum gas vacuum 4.2 In these piston/cylinders, when the red stop is slipped out, the gas expands, and the piston moves until it hits the black stops. Each system is adiabatic . Each starts at 10 atm and 25 o C and are ideal gases....
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This note was uploaded on 05/18/2011 for the course ENG 101 taught by Professor O'neill during the Spring '11 term at Alabama State University.

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ThermoConcepts1a - ConcepTests in Chemical Engineering...

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