Državni izpitni center. Izpitna pola 1. Sobota, 27. avgust 2016 / 90 minut
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1 Š i f r a k a n d i d a t a : Državni izpitni center *M * JESENSKI IZPITNI OK Izpitna pola 1 Sobota, 7. avgust 016 / 90 minut Dovoljeno gradivo in pripomočki: Kandidat prinese nalivno pero ali kemični svinčnik, svinčnik, radirko, šestilo, trikotnika in računalo. Kandidat dobi dva konceptna lista in ocenjevalni obrazec. Priloga s konstantami in enačbami ter magnetilnimi krivuljami je na perforiranem listu, ki ga kandidat pazljivo iztrga. SPLOŠNA MATUA NAVODILA KANDIDATU Pazljivo preberite ta navodila. Ne odpirajte izpitne pole in ne začenjajte reševati nalog, dokler vam nadzorni učitelj tega ne dovoli. Prilepite kodo oziroma vpišite svojo šifro (v okvirček desno zgoraj na tej strani in na ocenjevalni obrazec). Svojo šifro vpišite tudi na konceptna lista. Izpitna pola vsebuje 8 nalog s kratkimi odgovori in 3 strukturirane naloge. Število točk, ki jih lahko dosežete, je 40. Za posamezno nalogo je število točk navedeno v izpitni poli. Pri reševanju si lahko pomagate z zbirko konstant in enačb v prilogi. ešitve, ki jih pišite z nalivnim peresom ali s kemičnim svinčnikom, vpisujte v izpitno polo v za to predvideni prostor, slike in diagrame pa rišite prostoročno s svinčnikom. Pišite čitljivo. Če se zmotite, napisano prečrtajte in rešitev zapišite na novo. Nečitljivi zapisi in nejasni popravki bodo ocenjeni z 0 točkami. Osnutki rešitev, ki jih lahko naredite na konceptna lista, se pri ocenjevanju ne upoštevajo. Zaupajte vase in v svoje zmožnosti. Želimo vam veliko uspeha. Ta pola ima 16 strani, od tega prazni. IC 016
2 /16 *M *
3 *M * 3/16 Konstante in enačbe Elektrina in električni tok 19 e 0 1, C Q ne0 DQ i = D t I JA m cit Električno polje 1 As 0 8, Vm QQ 1 F 4 d F QE Q E 4 r q E r E D E E U Ed 0 r UAB VA VB F e Q DA Q C U W CU Enosmerna vezja I 0 k m k U 0 m U 1 I G P UI W Pt l l A A C A d w ED Magnetno polje 7 Vs Am miil 1 F = p d F BIl F B A o I B r Ir B r 0 NI B l F=BA M IABsin Hl B H H m l A 0 r Inducirano električno polje Y = N F u i Y t vbl ui U m N F m L Y N A L i l W Li F B A 0 w BH Trifazni sistemi Y1U Y U Y3U V 0 Y Y Y Izmenična električna vezja f Tf 1 u U sin t i I sin t u j = a - a j e cos jsin U Z 1 I Y Z jx Y G jb Z Z L Z C jl 1 jc S P jq U I Q tan 1 0 LC 1 Q L 0 i 1 C Prehodni pojavi u i u L di d t i C du d t 0 u U 1 e t / / u Ue t C i I 1 e t / / i Ie t L i u 1 0 C 0 P P izh vh P perforiran list
4 4/16 *M *
5 *M * 5/16 1. Fizikalna veličina ima enoto Vs/Am. Poimenujte fizikalno veličino in zapišite njeno oznako. ( točki). Dovoljena gostota toka v vodniku je J = A/mm. Izračunajte dopustni tok I, če je premer vodnika d = mm. ( točki)
6 6/16 *M * 3. Postopek elektrolize bakra poteka pri gostoti toka A = 5 m J = 500 A/m, površina elektrod je, elektrokemijski ekvivalent bakra je c = 0,39 10 kg/c. Izračunajte, koliko bakra se izloči na elektrodah v času -6 t = 10 h. ( točki) 4. Z ampermetrom, ki ima merilno območje I A = 50 ma in notranjo upornost A = 3,6 W, želimo meriti toke do I = 500 ma. Izračunajte potrebno upornost S soupora. ( točki)
7 *M * 7/16 5. Dano je enosmerno vezje V V U U - Določite označeni napetosti U 1 in U. ( točki) 6. Na uporu sta dana harmonična napetost ut ( ) = 0sin(400t + 30 ) V in tok it ( ) = 40sin(400t + 30 ) ma. Izračunajte moč P na uporu. ( točki)
8 8/16 *M * 7. Zaporedno L-vezje smo priključili na vir harmonične napetosti efektivne vrednosti U = 50 V. Na uporu smo izmerili efektivno vrednost napetosti U = 30 V. Izračunajte efektivno vrednost napetosti U L, ki bi jo izmerili na tuljavi. ( točki) 8. Za narisano vezje S i L U = 0 V L = 4 H izračunajte upornost, da se bo prehodni pojav praktično končal v času t = s. ( točki)
9 *M * 9/16 Prazna stran OBNITE LIST.
10 10/16 *M * 9. Bakrena žica ima prerez A = 0, mm in dolžino l = 50 m -6-1 ( r = 0, W m, a = 0,0039 K ) Izračunajte upornost žice 0 pri sobni temperaturi T = 0 C. ( točki) 9.. Izračunajte upornost žice 60 pri delovni temperaturi T = 60 C. ( točki)
11 *M * 11/ Izračunajte toploto Q, ki se sprosti v žici v času t = 5 min, če jo priključimo na napetost U = 0 V. ( točki) 9.4. Izračunajte dolžino l 1, ki bi jo morala imeti žica, da bi imela pri delovni temperaturi T = 60 C enako upornost kakor 50-metrska žica pri sobni temperaturi. ( točki)
12 1/16 *M * 10. Na sliki je vezje s podatki: = 0 W, C = 0 m F, L = 40 mh, U = j0 V in w = 1000 rad/s. I I 1 I L C U Izračunajte impedanco Z 1 zgornje veje vezja. ( točki) 10.. Izračunajte kazalca I 1 in I. ( točki)
13 *M * 13/ Izračunajte kompleksno moč S. ( točki) Izračunajte elementa nadomestnega zaporednega vezja. ( točki)
14 14/16 *M * 11. V narisanem vezju (z U = 1 V, 1 = = 1 MW in C = 1 m F ) ob času t = 0 izklopimo stikalo S. U = 1 V 1 = 1 MW t = 0 S C = 1 mf u C = 1 MW Določite napetost U C0 na kondenzatorju C v trenutku pred razklenitvijo stikala. ( točki) 11.. Izračunajte časovno konstanto t prehodnega pojava. ( točki)
15 *M * 15/ Izračunajte energijo v kondenzatorju C po končanem prehodnem pojavu. ( točki) Skicirajte časovni diagram napetosti na kondenzatorju C med prehodnim pojavom. ( točki)
16 16/16 *M * Prazna stran
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