Elektrotegnologie N3 — Document

April 2019 — N3 — Elektrotegnologie

N3 2019 Nated Engineering

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🎯 100 marks ⏱️ 3h 📄 7 pages 📝 46 items found

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1.1Die borsels wat in GS masjiene DC machines

1.2Die anker samestel armature assembly van

1.3Dui aan of die volgende stellings WAAR of ONWAAR is. Kies die ant woord en

1.3.2\in die ANTWOORDBOEK neer. Korrigeer die stelling indien dit ONWAAR is.

1.3.1Die rigting van vervorming van die vloed flux in 'n motor is

1.3.2Grafietborsels is meganies sterk. (2 [10] VRAAG10

2.1Die werking van 'n GS generator is afhanklik van die opwekking van sy veldspoel

2.2Teken die ken kromme characteristics curve van

2.3'n Omtakgenerator ( shunt wound generator \moet 'n

2.3.1Die grootte van die ankerstroom armature current (3\

2.3.2Die grootte van die ontwikkelde EM K ( generated EMF

3.1Elektriese masjiene word geb ruik om een vorm van energie in 'n ander vorm van energie om te skakel. Verduidelik die funksie van 'n GS motor

3.2Omtak motors Shunt wound motors

3.3Die volgende data is bekend oor 'n sekere GS serie motor: Aantal p le:

3.4'n Kopergrafietborsel is een van die soorte borsel in 'n GS

4.1'n 22 kW, GS generator met omtakwikkeling ( DC shunt

4.1.1Die ankerstroom armature current (3\

4.1.2Die koperverlies in die anker ( armature copper loss (2\

4.1.3Die koperverlies in die omtakveld ( shunt field copper loss (1\

4.1.4Die masjien se persentasie rendement efficiency

4.2Yster , wrywing en windingsverliese is konstante verliese wat in alle GS masjiene voorkom. Noem TWEE plekke in

5.1'n Alternator e uitsetspanning word deur 'n sinusgolfvorm voorgestel Verduidelik die volgende terme

5.1.1Oomblik waarde nstantaneous value

5.1.2

5.2'n Alternatiewe EMK word beskryf deur die uitdrukking e = 525sin (942,478t\ epaal die volgende

5.2.1Die EM se frekwensie

5.2.2Die golf se effek tiewe WGK waarde

5.2.3Die EM se oomblik waarde 1 ms na die aanvang van 'n

6.1Bereken die grootte van die fasehoek phase angle (1\

6.2Bereken die grootte van die stroom wat deur die las get trek word (2\

6.3

6.4Bereken die impedansie van die las. (2\

6.5Teken 'n geskikte vektordiagram om die spanning en stroomvektore as ook die fasehoek te toon. (3\

7.1Drie soorte krag word met 'n isselstroombaan

7.2Groot induksiemotors word aangeskakel terwyl hulle in ster verbind is en loop in delta. Toon

7.3In 'n driefase stelsel is daar lynspanning en fasespanning. Noem die verhouding tussen hierdie twee spannings in 'n stelse

8.1Drie enkelfase transformators kan elektries verbind word om vier verskillende driefase transformator konfigurasies te lewer

8.2'n 50 kVA transfor mator wat in delta ster verbind is,

8.2.1

8.2.2

8.2.310

9.1Werwelstroom demping ddy current damping ook bekend as

9.2'n Galvanometer met 'n toon vol e defleksie as 'n

9.3'n eheermeganisme e funksie is om beheermoment controlling torque

10.1'n Gelykrigter kring rectifier circuit word ge

10.2

Mark Allocation

Total100 marks

Sections10 + 10 + 10 + 10 + 10 + 10 + 10 + 10 + 10 + 10 = 100 marks

Paper information

TitleDocument

SubjectElektrotegnologie

LevelN3

Document typeQuestion paper

Year2019

MonthApril

Pages10

Downloads3

Examination context

Decade2010s

Years ago7y

SeasonAutumn (SH)

Start dayMonday

Exam periodApril 2019

Days since exam2,750

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