[試題] 108-2 劉志文電力工程導論期中考

看板NTU-Exam作者chun10396974 (娜嗲希口老公)時間5年前 (2020/04/22 16:45)推噓3(3推 0噓 1→)

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課程名稱︰電力工程導論課程性質︰電機工程學系複選必修暨離岸風力發電學分學程進階專業選修課程課程教師︰劉志文開課學院：電機資訊學院開課系所︰電機工程學系考試日期（年月日）︰2020/4/21 考試時限（分鐘）：14:20-16:50 試題 : 1-6題每題10分，第7題15分，第8題25分 1. In Figure 1, v(t) = √2 × 120cos(ωt + 30°) i(t) = √2 × 10cos(ωt － 30°) (a) Find p(t), S, P, and Q into the network. (b) Find a simple (two-element) series circuit consistent with the prescribed terminal behavior as described in this problem. Fig.1 https://imgur.com/AMluD69

2. A 1φ load draws 10kW from a 416-V line at a power factor of 0.9 lagging. (a) Find S = P ＋ jQ. (b) Find │I│. (c) Assume that ∠I = 0 and find p(t). 3. In Figure 2, find the total complex power delivered to the load. Assume that ZC = －j0.2 ZL = j0.1 R = 10 Fig.2 https://imgur.com/SGg3sKu

4. In the system shown in Figure 3, find Ia, Ib, Ic if (a) Za = Zb = j1.0, Zc = j0.9 (b) Za = Zb = Zc = j1.0 Hint: Use per phase analysis in part (b) Fig3. https://imgur.com/npT0iAw

5. The system shown in Figure 4 is balanced. Find Va'n, Vb'n, Vc'n, and Va'b' Fig4. https://imgur.com/Kx1SpcH

6. The system shown in Figure 5 is balanced. Assume that load inductors, ZL = j10 load capacitors, ZC = －j10 3φ Find Ia, Icap, and S . load Fig5. https://imgur.com/x0XnWIH

7. In Figure 6, assume that Ea = √2∠45° Eb = 1∠-90° Ec = 1∠180° Ia = 1∠-10° Fig6. https://imgur.com/gY65wze

The load is symmetrical and Z is not given. The sources are not balanced, 3φ but we noted that Ea + Eb + Ec = 0. Find S . load 8. Justify the formula l = 4 × 10^(－7)ln(D/r') henrys per meter for the round -trip inductance of a single-phase line made up of round wires of radius r separated by a distance D between centers. For simplicity, assume that D＞＞r and make reasonable simplifications. Note that the inductance "per conductor" is the same as the per phase inductance of a three-phase line, but the inductance is doubled because there are two conductors. -- A person can only murder another once. The act of murder is giving up the humanity that is within oneself. What is left is just emptiness. You can not lose humanity if it is already lost. The act of murder turns into the act of slaughter. They are two different things.—Ryougi Shiki《A Study in Murder》 https://imgur.com/cq2YDbl

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unmolk

04/22 20:15, 5年前 , 1^F

04/22 20:15, 1^F

真低佛，全都課本題，而且可以上網喔，嘻嘻 ※ 編輯: chun10396974 (140.112.245.134 臺灣), 04/22/2020 22:28:24 ※ 編輯: chun10396974 (140.112.245.134 臺灣), 04/22/2020 22:28:56

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unmolk

04/24 00:22, 5年前 , 2^F

04/24 00:22, 2^F

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unmolk

04/24 00:22, 5年前 , 3^F