· The synchronous machines are associated with the names of Ferraris · Name the scientists who first studied electrical phenomena Coulomb · The DC machines are associated with the names of Jacobi Henry · The leading companies in the world market of electrical drive engineering are Mitsubishi · · The electromagnetic torque is born in air gap · What kind of drives the majority of drive systems present low accuracy · The induction machines are associated with the names of Dolivo-Dobrovolsky Tesla · One of the first eletrical motors has been built by Jacobi · Electromagnetic efficiency is measured in tesla · Time constants are measured by ms s hours · Who is the author of the first electrical motor Henry · Which rectifier cannot be built without a transformer 3-phase midpoint · Call the benefits of 3-phase rectifiers upon the 1-phase ones output voltage · Which rectifier has more diodes 3-phase bridge
Test VIII - cumulative test by Piigli, Mets, Parker, Kauler "Top delusion" question / answers are red. Test I The induction machines are associated with the names of Dolivo - Dobrovolsky, Tesla. The synchronous machines are associated with the name of Ferraris. The DC machines are associated with the names of Jacobi and Henry. The electromagnetic torque is born in air gap. The torque is proportional to the current in dc motor. Which equations are correct? P = sW; oomega = tuletis fii'st The angular frequency is 2*pi()*n / 60 ja 2*pi()f The motor torque is equal to TL + J * oomega tuletis aja järgi The inductor supplies the motor with flux.
ringliikumise korral). Pinge perioodiliste muutuste sageduseks on Euroopa riikides (sh. Eestis) valitud 50 hertsi (võnget sekundis) ning perioodiks T seega 20 millisekundit: 1 1 T = = = 0,02 s = 20 ms . f 50 Hz 11 Kolmefaasilise vahelduvvoolu patenteeris 08.03.1889.a. Saksa firma AEG peainsener Michael von Dolivo Dobrovolsky. 68 Meil kasutatakse vahelduvpinget, mille pinge väärtus on 220 V, mujal Euroliidus on normiks 230 V. Võib küsida, et mis vahelduvpinge see on, kui pinge väärtus ei muutu, on 230 V ? Väärtus muutub eespool toodud sagedusega (50 Hz), see 230 V on aga nn. efektiivpinge Uef, mis on võrdne alalispingega, mis teeks sama aja jooksul samapalju tööd kui antud vahelduvvoolgi.
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