Spring 2015 Test 1 & Solutions - ASE 362K Test#1 Spring...

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Mechanics of Materials
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Chapter 3 / Exercise 3.7-6
Mechanics of Materials
Gere/Goodno
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ASE 362KTest #1Spring 2015March 3rd, 2014 Page 1of 3Name:Section 1 (Short-Answer Questions)(20/80 pts)Instructions:You may answer the following questions in the space provided. Use additional paper if necessary, and attach Pages 1 & 2 to the front of your work.1.Air flows through an insulated, converging-diverging nozzle in which the cross-sectional area changes gradually, so that gradients in the direction of the flow are small and properties are uniform across any cross-section. Does entropy increase, decrease or remain the same between the nozzle inlet and outlet? Justify your answer. (2 pts)2.Considering a stationary normal shock wave, answer (a), (b) and (c) below. (a)How do (i) pressure, (ii) temperature, (iii) density, (iv) Mach number and (v) entropy change (qualitatively) across the shock? (2 pts)(b)Circle the correct answer: “The post-shock Mach number is always subsonic / always supersonic / sometimes subsonic / always sonic.(1 pt)(c)What happens to the stagnation temperature and stagnation pressure across the shock? Discuss why. (2 pts)3.Air at 250 kPa and 375K is confined in an insulated chamber, as shown below. A piston is used to allow the gas to slowly expand to a pressure of 100 kPa. What is the temperature and density of the gas at this new state? (3 pts)
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The document you are viewing contains questions related to this textbook.
Mechanics of Materials
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Chapter 3 / Exercise 3.7-6
Mechanics of Materials
Gere/Goodno
Expert Verified
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