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71.有台 20 馬力之三相感應電動機,若已知全壓起動電流為 90 安培,則採 Y-∆ 降壓起動時,起動電流應為若干?(A) 30 安培(B) 45 安培(C) 60 安培(D) 180 安培
問題詳情
71.有台 20 馬力之三相感應電動機,若已知全壓起動電流為 90 安培,則採 Y-∆ 降壓起動時,起動電流應為若干?
(A) 30 安培
(B) 45 安培
(C) 60 安培
(D) 180 安培
參考答案
答案:A
難度:
計算中
-1
書單:
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70.接於三相感應電動機之三條電源線,任意兩條互相對換二次,則電動機:(A) 改變轉向(B) 轉向不變(C) 停止轉動(D) 轉速升高
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72.有台4極 50 馬力 220 伏特之三相感應電動機工作於額定電壓,其起動轉矩為 300 牛頓-公尺,若將電壓降至 110伏特,則其起動轉矩變為若干牛頓-公尺?(A) 75(B) 100(C) 1
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