Državni izpitni center. Izpitna pola 1. Četrtek, 4. junij 2015 / 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 * SPOMLADANSKI IZPITNI ROK Izpitna pola 1 Četrtek, 4. junij 015 / 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 MATRA NAVODILA KANDIDAT 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. Rešitve, 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. RIC 015
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 A s 0 8, Vm QQ 1 F 4 d F QE Q E 4 r q E r E D E E 0 r Ed V V AB A B F e Q DA Q C W C Enosmerna vezja I 0 k m k 0 m C A d w ED R 1 I G P I W Pt l R l A A R 1 0 C R0 Pizh P vh Magnetno polje 7 Vs A m 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 R m l A 0 r Inducirano električno polje Y = N F u i Y t vbl ui m N F m L Y N A L i l W Li w BH F B A 0 Trifazni sistemi Y 1 Y Y3 V 0 Y Y Y Izmenična električna vezja f Tf 1 u sin t i I sin t i j = a - a j u e cos jsin Z 1 I Y Z R jx Y G jb Z R Z L Z C R jl 1 jc S P jq I Q tan 1 0 LC 1 0L Q 1 R CR Prehodni pojavi u Ri u L di d t i C du d t i 0 u 1 e t / u e t / RC i I 1 e t / i Ie t / L R u P perforiran list
4 4/16 *M *
5 *M * 5/16 1. Električni pretok. S katero enoto mednarodnega merskega sistema izražamo električni pretok? Izrazite osnovno enoto električnega pretoka z drugimi enotami SI.. Akumulator ima kapaciteto 36 Ah in se je pri stalnem toku I izpraznil v treh dneh. Izračunajte tok I praznjenja akumulatorja.
6 6/16 *M * 3. Jekleni valjanec preseka 40 mm 5 mm uporabimo za strelovodni vodnik. Ob streli je tok skozenj 5 ka. Kolikšna je takrat povprečna gostota električnega toka v njem? 4. Pri priključeni napetosti 30 V je moč grelca kw. Kolikšna bo njegova moč, če pade napetost na 00 V?
7 *M * 7/16 5. Na enosmerni vir z dano karakteristiko I - priključimo prilagojeno breme. I A V Določite upornost prilagojenega bremena. 6. Napetost na kondenzatorju s kapacitivnostjo C 150 F je ut 300cos400t 30 V. Zapišite izraz za trenutno vrednost toka kondenzatorja.
8 8/16 *M * 7. Admitanca kompleksnega bremena je Y 10 j0 ms. Izračunajte fazni kot bremena. 8. Zaporedno vezavo tuljave L 1 H in upora R 10 priključimo na vir enosmerne napetosti. V času t 100 ms tok doseže vrednost i 0,5 A. Izračunajte napetost, na katero je priključena zaporedna vezava.
9 *M * 9/16 Prazna stran OBRNITE LIST.
10 10/16 *M * 9. Dano je enosmerno vezje s podatki: IA 50 ma, 10 V, R1 R R3 1 k. I R 1 3 I A I X A R1 R3 + - R X 9.1. Izračunajte napetost na uporu R. 9.. Izračunajte napetost 1 na uporu R 1.
11 *M * 11/ Izračunajte tok I X skozi upor X R Izračunajte delo W X, ki se opravi na uporu R X v času t 30 min.
12 1/16 *M * 10. Podatki vezja so: R1 8, L 305,5 mh in R 50 ter f 50 Hz. Kazalec napetosti na uporu R 1 je 1 56 V. R I R 1 I 1 I R f L R Izračunajte impedanco tuljave Z L Izračunajte kazalec toka I 1.
13 *M * 13/ Izračunajte kazalec napetosti Izračunajte kazalec skupnega toka I.
14 14/16 *M * 11. Dano je vezje s podatki: R 0, C 10 F in 100 V. Kondenzator je naelektren z elektrino Q0 100 C. Stikalo S je razklenjeno. + - S t 0 R C + Q Izračunajte napetost C0 na kondenzatorju pred sklenitvijo stikala S Stikalo S sklenemo. Izračunajte časovno konstanto prehodnega pojava po sklenitvi stikala.
15 *M * 15/ Skicirajte časovni potek napetosti na kondenzatorju u t med prehodnim pojavom. C Zapišite enačbo za časovni potek napetosti u t med prehodnim pojavom. C
16 16/16 *M * Prazna stran
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