2020APS110TestMCQSOLUTIONS

.pdf

School

University of Toronto *

*We aren’t endorsed by this school

Course

110H!

Subject

Mechanical Engineering

Date

Dec 6, 2023

Type

pdf

Pages

24

Uploaded by LieutenantTankFox40

Report
CONCEPT VERSION UNIVERSITY OF TORONTO FACULTY OF APPLIED SCIENCE AND ENGINEERING Multiple Choice Assessment Due: October 29t 2020 by 2359 Eastern Daylight Time (Toronto) First Year APS110 - INTRODUCTORY CHEMISTRY AND MATERIALS SCIENCE Exam Type: X (Open Book; Internet, if not communicated /posted during test: no communication with others) Examiners: M Kortschot, CQ Jia, SD Ramsay Note: as thes 13 a final assessmend, late submessions wnll not be accepled. This means that if you do not submit your responses successfully to Crowdmark by the deadline you will not be able to submit and you will need Lo submsl an official petilron. Therefore, il +s higyhly advisable thal you make plans to complete and submit your final responses 2-3 hours early. Instructions: ¢ You must correctly indicate your test version code on your the Microsoft [orm. If you do not, or [ill this in incorrectly, vour [inal assessment will not be graded. ¢ Answer all questions. e Fill in the answers on the Microsoft Form. Concept version Page 1 of 24
. oL Af: /.09~ /" + §HOwm : 4o (o )P« . yo(w"). 21 . gs(10*)P <= YO )gqo 6(!)« s 65 NMN& 1. Which of the following are the correct units for strain? (a)”Dimensionless b) mm (¢) m (d) inches Correct answers: (a)/ . The Abraham Lincoln DBridge, spanning the Ohio River from Louisville, Kentucky to Jeffersonville, Indiana, is designed with ex- pansion joints to provide for 1.04m of linear thermal expansion along the length of the bridge. Consider if this bridge had been built with- out these expansion joints and 1.04m of linear expansion occurred, but the bridge was rigidly [ixed at both ends, preventing this expan- sion. If the elastic modulus of the concrete in the bridge is 40 GPa and the compressive fracture strex of the concrete is 28 MPa, what stress would you expect to be imposed, _on the bridge? LTo'tc.\ S éqOM OJ\’/ (Expansion joint data from www.rjwatson.com/Projects/ohio-river- bridge-rjw-linger-joints, accessed October 25, 2020, Image [rom Censusdata at English Wikipedia, commons.wikimedia.org/wiki/ File:2016 WIKI_AbrahamLincolnBridgeLouKYJunel2.jpg, CC BY-SA 4.0 creativecommons.org/licenses/by-sa/4.0, via Wikimedia Commons.)) @ MPa 5] 21 MPa (c) 3MPa (d) 6 GPa Correct answers: (a) Concept version Page 2 of 24
/_—:;— ) &/ Cwol T SR o IRCE Y - [ ] _ O.D’L - b PpT7xcC 7 3. T'wo ropes are cut, the first to 1m in length and the second to 3m in length. Both pieces of rope are then stretched by 2 cm. What will 2 the ratio of the strain in the first to the strain in the second be? b Ore ‘g' - qual because strain is sample size independent - 3 ? Z(u)'l) (c) 0.33 ) 2 Correct answers: (a) \_/ -’) 4. Referring to the figure below, noting that both cylinders are made from the sai aterjal, which of the following statements are correct cvlinders ®A” and "B"? AII " B” lo RCLLDR (a) ABoth cylinders have the ame stress and the same strain F F . : E (b) Both cylinders have the | same stress only = (c) Both cylinders have the same strain only Iy+Al (d) Ir‘npossablg to detgrmme - from information provided PO " s ~ Cp - LY 4 Correct answers: (a) Concept version Page 3 of 24
5. A sample of a heavily cold worked 316L stainless steel is heated for several hours in a furnace at 1065°C. The sample is then allowed to ¢ o room temperature. Relative to the value before the heat treatment, the Young’s modulus after this' heat t.roat.menét_swill be which of the following? Sow Heat Less v —=ne.ohen - ok S 5) Greater than (‘l'b Qron Size A b botend Spmly m v ? (d) Unable to determine with information provided Correct answers: (a) 6. A sample of a heavily cold worked 316L stainless steel is heated for several hours in a furnace at 1065°C. The sample is then allowed to cool to room temperature. Relative to the value before the heat treatment, the vield strength after this heat treatment, will be which of the following? I/’G‘;'i'o'( et T a) Less than Lsy, Chy ¥Rz Ghwe (b) Greater than\/ Lp grew she b Ly Gudots f 1> 6)'*9“,5%5'4\ The same as (d) Unable to determine with information provided Correct answers: (a) 7. A sample of a heavily cold worked 316L stainless steel is heated for several hours in a furnace at 1065°C. The sample is then allowed to cool_to room temperature. Relative to the value before the heat treatment, the plastic deformation at fracture after this heat treat- } N . . . . ? . ) ment will be which of the following’ ol NN % D *"""U v Greater than ess than The same as (d) Unable to determine with information provided Correct answers: (a) Concept version Page 4 of 24
8. Referring to the stress-strain curve below, which of the following is closest to the value for the yield strength? RS R R R LA A AN AN LR RN LA AR o) @ = e = o~ [ - ~ =] > =} = = = ) » - c o (=] = oD (=1 60 MPa ) 150 MPa (¢) 300MPa Concept version Page 5 of 24
9. Referring to the stress-strain curve below, which of the following is closest to the value for the ultimate tensile strength? 33 - %_‘-\\ % 4 0 : : : : i 2504 . - 0 .Fo,e 4 . (A : Rond*j - 200 ( [ -] - Dow» - c = L ——— 100 - —4 4 e RS RREES RN RR AR AR RN RAR RS AR LA AR AR RRRAR C 2] - O -~ @ [~ o o~ [ C ] o o o =} -] o - o - - - - o o o o o o o o o o o o S (¢) 200MPa (d) 260 MPa Correct answers: (a) / Concept version Page 6 of 24
Your preview ends here
Eager to read complete document? Join bartleby learn and gain access to the full version
  • Access to all documents
  • Unlimited textbook solutions
  • 24/7 expert homework help