Elektrotegniek N5 — Document

April 2019 — N5 — Elektrotegniek

N5 2019 Nated Engineering

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🎯 100 marks ⏱️ 3h 📄 5 pages 📝 32 items found

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1.1Ho e kan die aantal parallel lbane ( parallel paths

1.2'n Sespool GS motor ( six

1.2.1Demagnetis eer en dwarsmagnetiserende amp re windings

1.2.2Addisionele veldstroom benodig om hierdie demagnetisering te neutraliseer as die veldwikkeling ( field winding

1.3'n 120 V GS sjuntmotor ( DC shunt motor

1.3.1Tot watter waarde die ankerstroom sal toeneem

1.3.2Tot watter spoed die motor sal versnel gnore er die induktiewe effek en ankerreaksie en veronderstel die las draaimoment ( load torque

2.1'n Kring het 'n weerstand van 8 ohm 'n induktansie van 0,6 henry

2.1.1apa itan sie om resonansie te gee (4\

2.1.2Spanning oor die weerstand die induktansie en die kapasitansie (3\ 8080085

2.2'n Spoel gebruik 'n stroom van 10 A en dissipeer 100 W as dit aan

2.2.1otal e stroom (11\

2.2.2Kragfaktor (2\ [20] VRAAG20

3.1Verduidelik die kragfaktor van 'n transform ator by nullas ( at no load \ met

3.2Noem DRIE metodes om 'n lekvloed ( leakage flu \in 'n

3.3'n 135 kVA enkelfase transormator ( single phase transformer

3.3.1

3.3.2Rea ktansie per eenheid (2\

3.3.3Weerstand ( esistance \r eenheid (2\

3.3.4Impedan sie per eenheid (2\ [20] VRAAG20

4.1Die kragtoevoer na 'n 200 driefase deltaverbinde induksiemotor (2 200 three

4.1.1Fasestroom ( hase current (3\

4.1.2

4.2'n Driefase bogrondse lyn ( three phase overhead line \wat 10 km lank is

4.2.1

4.2.2Op die hoeke van 'n driehoek waarvan die sye 40 cm, 70 cm en 100 cm

4.3Die tweewattmetermetode ( two wattmeter method \word t oegepas op 'n

5.1Noem TWEE metodes om die glip ( slip \an 'n induksiemotor te vind. (2\

5.2'n Driefase ster verbinde alternator van 50 Hz moet 'n lynspanning van 12 kV lewer as die masjien op oopkring is. Die vloed is 0,18 Wb

5.3'n Driefase sleepring nduksiemotor phase slip

5.3.1Rotorstroom per fase as die motor teen 4% glip slip loop

5.3.2Persentasie glip en rotorstroom per fase wanneer die motor maksimum draaimoment maximum torque ontwikkel (6\

Mark Allocation

Total100 marks

Sections20 + 20 + 20 + 20 + 20 = 100 marks

Paper information

TitleDocument

SubjectElektrotegniek

LevelN5

Document typeQuestion paper

Year2019

MonthApril

Pages5

Downloads1

Examination context

Decade2010s

Years ago7y

SeasonAutumn (SH)

Start dayMonday

Exam periodApril 2019

Days since exam2,751

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