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49. 6 極、60Hz 之繞線型感應電動機,若在滿載時的轉速為 1152rpm,又二次側每相之電阻為 4Ω,欲使轉速降為 960rpm,則應插入外部電阻值為?(A) 6Ω(B) 12Ω(C) 14Ω
問題詳情
49. 6 極、60Hz 之繞線型感應電動機,若在滿載時的轉速為 1152rpm,又二次側每相之電阻為 4Ω,欲使轉速降為 960rpm,則應插入外部電阻值為?
(A) 6Ω
(B) 12Ω
(C) 14Ω
(D) 16Ω
參考答案
答案:D
難度:
計算中
-1
書單:
沒有書單,新增
上一篇 :
48. 三相四極感應電動機,定子電源為 60Hz,若以外力使其轉子以 600rpm 的速度反磁場方向旋轉,該轉子的感應電勢頻率為?(A) 40 Hz(B) 60 Hz(C) 80 Hz(D) 100
下一篇 :
50. 12kW,100V 之直流分激式發電機,磁場電阻為 20Ω,電樞電阻為 0.08Ω,鐵損及機械損之和為 1250W,試求滿載效率是多少?(A) 75%(B) 77.5%(C) 80%(D) 8
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