資訊推薦

• 43.一台 110 伏特之分激電動機，其電樞電阻為 0.5 歐姆，分激場電阻為 55 歐姆，電刷壓降為 2 伏特，滿載時線路電流為 30 安培，轉速為 1500rpm，若不考慮電樞反應，則滿載反電勢為
• 50.某直流長分路複激式發電機，當負載電流 IL為 40 安培時，端電壓 VL為 110 伏特，分激場電流 If為 2 安培，電樞電阻 Ra 為 0.2 歐姆，串激場電阻 Rs 為 0.3 歐姆，若不
• 46.某 100kW 直流發電機，定值損失為 8kW，滿載時的可變損失為 6kW，若此發電機於一天內滿載 6小時，半載 12 小時，其餘時間停止運轉(斷電狀態)，則此電機全日電能損失為多少？(A) 2
• 49.某三相 4 極感應電動機，已知 R2＝0.1 Ω，X2＝0.4 Ω，欲使啟動時產生最大轉矩，則轉子應串接多少 Ω 的電阻？(A) 0.4 Ω (B) 0.3 Ω(C) 0.2 Ω (D) 0.1
• 48.關於兩部同步發電機並聯運轉之敘述，下列何者錯誤？(A)增減任一發電機的激磁電流，可以改變發電機間無效功率之分擔(B)兩部發電機的容量須相同才可並聯運轉，否則絕不可並聯運轉(C)增減任一發電機的激
• 47.某三相 4 極感應電動機，採用直接啟動時啟動電流(IS)為 120A，啟動轉矩(TS)為 30 牛頓－公尺。若改為 Y–Δ 降壓啟動，則啟動電流(IS)與啟動轉矩(TS)分別為何？(A) IS
• 44.有一步進電動機，轉速為 300rpm，每秒共有 2000 步，試求步進角為幾度？(A) 7.2° (B) 3.6° (C) 1.8° (D) 0.9°
• 45.有一三相感應電動機，在某一負載時其轉差率為 0.04，若將轉部電阻增加為 3 倍而轉矩保持不變，則轉差率應變為多少？(A) 0.12 (B) 0.06 (C) 0.03 (D) 0.015
• 1. 下列有關植物體的化學組成之敘述，何者錯誤？(A) 甜菜根的紅色色素是屬於水溶性色素(B) 蛋白質是由碳、氫、氧、氮、硫等元素所組成之有機化合物(C) DNA複製時，其中一條會先複製出小片段，再黏
• 二、文法測驗【請在下列各題中選出最適當的答案】34. She is ________ than any other girl in her class.(A) taller (B) tallest (
• 27. It’s ________ today. You’d better put on a jacket.(A) chilly (B) modest (C) gentle (D) previous
• 28. Bananas are grown in ________ regions, where the climate is hot and wet.(A) magnetic (B) reliabl
• 三、克漏字測驗【請依照段落上下文意，選出最適當的答案】    Around the world, one in four people will have some kind of mental il
• 29. I usually ________ money from ATMs, which are more convenient than banks.(A) surrender (B) trans
• 40. ________, please keep me in the know right away.(A) You should know the answer (B) Should you kn
• 30. He ________ everything for his family. And he never complained.(A) penetrated (B) sacrificed (C)
• 31. Walking is a good way to ________ a city. You can see almost every corner of the place.(A) assem
• 32. This school is famous for beautiful campus and advanced ________.(A) continents (B) facilities (
• 33. It’s ________ clear that he did it. All the evidence showed he killed the boy for sure.(A) cryst
• 35. I’ve spent hours ________ out the problems. I finally made it.(A) work (B) worked (C) working (D
• 36. He’s been living in Taiwan ________ 2012.(A) before (B) for (C) in (D) since
• 38. ________ he was good at math was known to everybody in his class.(A) That (B) Unless (C) Which (
• 四、閱讀測驗【請依照段落上下文意，選出最適當的答案】   Are you tired of your home country? Do you dream of better opportunitie
• 37. I ________ you the news if I knew it last week. But I found it out just now.(A) should tell (B)
• 【題組】42. (A) Though (B) For (C) Why (D) Yet