3100_midterm_09

3100_midterm_09 - DALHOUSIE Nam U “WEE-.3113...

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Unformatted text preview: DALHOUSIE Nam U “WEE-.3113 ltl:;=rt'r:-:_t; lltIrIt-tltu' Dalheusie University Department ef Eleetriea] and Cempnter Engineering ECED 310i) Eleetrenteehanies MID - TERM EXAM {let twee Answer all questiens en the test sheet Questien 1 '[2 marks] A lead is te be driven by either Meter A er Meter B. The graph tn the right shews the twe meter speed vs terqne enrves and the lead curve. The tetal drive system mement ef inertia (inelnriing meter and lead) is 0.1333 leg—mI and frietien can be negleeted. a) Draw the speed vs time eurve fer eaeh ef the twe meters during start-up en the axis given ‘eelew {be as speeifie, with numbers, as pessihle}. h) After reaehing steady state, whieh meter delivers the rnest pewer tn the lead and why'?I FE; '. ‘l-L; at .e-ir 1_.,__ 4| [ii—J -|.r| s._l. E-tn Harmer ID. Bannor ID on wasn't? Ira-Ilu'uut: 11:sz DALHOUSIE Name: _F____——— Qnosfion 2 [4 marks] Tho diagram to tho right shows a portion of a Maawoll, finito-olotnont, magnotostatio solution of an air gap in tho rogion of a stool ooro. Tho linos shown aro flint linos. Tho stool ooro is 25 min doop (Lo. into tho pago}. a) If tho flu‘s donsin at tho top and bottom of tho piotnro is {15 T, what is tho fins. donsin at tho oontor of tho air gap? - I? _____ (firth availing _r 0-5 035333 '_- a: figs-sh j {5-1-1 b) What is tho rnagnotio offoot as shown in tho diagram oaliod'? QFi-fifljr‘nfi / o) How many Ampoto-t {PM _, 'H: I R: ll-q'flqtilfl‘ d) What foroo is tho lowot stool ooro osporionoing in tho X and Y ditootions'iI E '3} do"? a “J-(fififlf l' slid—“latnht I ii“ '1 | ____.--~— Banner ID DALHOUSIE Name ________————— u N I v e 115 L173; Lu _rl:r:n1.; him-tire Questiun 3 [4 marks] A tcreid has a radius cf 10 cm and a circular crcss-sectien cf Dflflflilml. It is came-used cf twre equal arc lengths cf cast iren and cast steel as shewn {the B-H curves are presided). a} Henr many amps are required in a 100 turn ccil (mapped arcund the tereid) tn establish 120 MM: cf magnetic flint in the care? Presses .4" rt' muffins Cast Steel ("slim was Eu "5% 23:3 :fiflt” : Leestntu' F .7 1&5 (asset!) IR“ _— £111.31!” J t .. @‘Wii'iifi‘m ,,__ - ‘ a??? bsmasnfit Iurd F as J! Li" Er 11:; imrb “Pi-'7'— :i.'$r2 ¢ {Mil “‘3 N11“ E :3, him. amines V: 1 {2. c) If a segment cf the cast steel is cut cut and replaced by a ferrite magnet ef equal cress sectiun, what length cf magnet will be needed Id be tc prcduce the same flux as in part a)? The ferrite characteristics are shown en the tighL )0 r {ENG-"cu. seam: fl I_.I_'I.I.L. um casserole hie-33' 1! H F K Le LJ flfl'fifl J Emmet; DALHOUSIE “31113 ____h_____ Bannar [D W U N I v E 115le ....-.'=I_-:1'r.':_; -'iJ.'HJ:~ 1.0 III-r " ll Silififlfitfifl “ VIII 1 A B T 0.6 ” Elfiflfl 0.4 ‘ . [Illa I Castirn r A 2013 400 600 300 1000 ...
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3100_midterm_09 - DALHOUSIE Nam U “WEE-.3113...

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