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3. 有一台水力發電機使用的絕緣材料為 F 絕緣等級,求其可容許最高溫度為何?(A) 90 ℃ (B) 130 ℃ (C) 155 ℃ (D) 180 ℃
問題詳情
3. 有一台水力發電機使用的絕緣材料為 F 絕緣等級,求其可容許最高溫度為何?
(A) 90 ℃
(B) 130 ℃
(C) 155 ℃
(D) 180 ℃
參考答案
答案:C
難度:
簡單
0.762
書單:
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2. 有一部 1.5 kW、100 V之直流電動機,滿載效率 75 %,求其滿載電流為何?(A) 10 A (B) 20 A (C) 25 A (D) 40 A
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4. 有一磁路已知磁阻為 4000 AT / Wb,鐵心上繞有 2000 匝的線圈,外加電流 5 A,則產生之磁通量為何?(A) 1 Wb (B) 2 Wb (C) 2.5 Wb (D) 4 Wb
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5. 變壓器鐵心如採用內鐵式,與外鐵式相比較,下列何者有誤?(A)絕緣散熱好 (B)適於高電壓、低電流(C)抑制機械應力好 (D)用鐵量少
6. 有關理想變壓器,下列何者有誤?(A)銅損 = 0、鐵損 = 0 (B)效率 η = 1(C)導磁係數 μ = ∞ (D)電壓調整率 ε = 1
7. 有一部配電用變壓器容量 15 kVA,鐵損為 150 W,滿載銅損為 400 W,負載功率因數為 0.8,求其在半載之效率為何?(A) 95 % (B) 96 % (C) 97 % (D) 98
8. 有一部 20 kVA、2000 V / 200 V之變壓器,求高壓側與低壓側額定電流各為何?(A) 1 A、10 A (B) 10 A、10 A(C) 10 A、100 A (D) 100 A、
9. 有一部單相 3300 V / 220 V變壓器,若高壓側電阻為 90 Ω,則等效至低壓側的電阻值為何?(A) 0.4 Ω (B) 4 Ω (C) 40 Ω (D) 400 Ω
10. 有一部單相變壓器匝數比為 20:1,滿載時二次側端電壓為 100 V,一次側端電壓為 2080 V,則其電壓調整率為何?(A) 2 % (B) 3 % (C) 4 % (D) 5 %
11. 有關變壓器之三相△連接,下列何者正確?(A)線電壓= 相電壓 (B)線電壓=相電壓(C)線電流=相電流 (D) 線電流=相電流
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