資訊推薦

• 32.一部他激式電動機之速度控制實驗，輸出轉矩固定，磁場繞組電壓固定、激磁電流不變，當電樞電壓接上200V時，測得轉速為1500rpm，若將電樞電壓調整為180V時，則測得之轉速約為多少 rpm？ (
• 33.一部單相220V\/110V變壓器之滿載負載實驗時，負載為純電阻，測得一次側電壓與電流分別為220V與10A，功率因數接近1，二次側電壓與電流分別為110V與19A，則此變壓器之滿載效率約為多
• 34.用三部22.8kV\/380V、100kVA單相變壓器接成Δ-Δ接線之三相變壓器，當有一台單相變壓器故障時，下列敘述何者錯誤？ (A)總輸出容量為173kVA (B)二次側線電壓為380V (
• 35.在三相感應電動機電樞繞組連接實驗時，將電動機設計為2極36槽且採雙層繞，若A相繞組始端置於第1槽，則B相繞組始端應由第幾槽開始放置？ (A)第2槽 (B)第7槽 (C)第13槽 (D)第24槽
• 36.關於三相感應電動機之無載實驗，下列敘述何者錯誤？ (A)可估算得到每相繞組等效電路之參數值 (B)可估算得到激磁等效電路之參數值 (C)可估算得到無載功率因數 (D)可測得無載損失
• 37.關於三相感應電動機之堵住實驗，下列敘述何者錯誤？ (A)可測得定子和轉子繞組之銅損和 (B)可估算得到激磁等效電路之參數值 (C)可估算得到每相繞組等效電路之參數值 (D)可估算得到堵住(短路)
• 38.使用二明一滅法檢驗二部三相同步發電機是否可滿足並聯運轉條件時，若出現三燈皆滅情況，下列敘述何者正確？ (A)表示兩機之相位稍異 (B)表示兩機之頻率稍異 (C)表示兩機之電壓大小稍異 (D)表示
• 39.關於三相同步電動機之激磁特性(V形曲線)量測實驗，下列敘述何者正確？ (A)V形曲線的縱軸為激磁電流、橫軸為電樞電流 (B)負載越重時，電樞電流越小 (C)某一負載下，當激磁電流由很小增加到使電
• 40.在步進電動機驅動實驗時，若使用四相30個凸極的可變磁阻型步進電動機，則其步進角為何？ (A)3度 (B)5度 (C)7度 (D)9度
• 19.將布林代數式F(W,X,Y,Z)=Σ(5,12,13,14,15)化簡之後，其 SOP(SumofProduct)最簡式為何？ (A) (B) (C) (D)
• 25. 圖(十六)為全球的降水季節分布示意 圖，可分成全年有雨、全年少雨、夏季降水為主、冬季降水為主等四大類 型，圖例中的甲、乙、丙、丁何者是夏季降水為主？(A)甲 (B)乙 (C)丙 (D)丁
• 2. What is the name given to the specific location of a gene on a chromosome? (A) operon (B) locus (
• 3. To replicate DNA, which of the following is NOT required? (A) DNA primer (B) DNA template (C) DNA
• 4. DNA polymerase IIl synthesizes the leading strand as a continuous strand. The lagging strands are
• 5. If adenine makes up 20% of the bases in a DNA helix, what percent of the bases is guanine? (A)20%
• 6. As the two strands of DNA are unraveled, an enzyme relieves the strain on the two strands. The en
• 7. Gel electrophoresis separates DNA fragments primarily on the basis of differences in their_______
• 8. Which of the following enzymes removes the primers used for DNA replication? (A) DNA polymerase I
• 9. Which of the following are removed from mRNAs during processing? (A) exons (B) noncoding sequence
• 10. Consider the following sequence:5'AUGGCUACAGAUAGCUGGGGCUGAAAAAAAAAAAAAAAA3'The given s
• 11. The \"central dogma\" for gene expression cannot describe which of the following phe
• 12. Which of the following factors recognizes the UAG, UAA, and UGA codons? (A) RNA polymerase (B) i
• 13. Which nucleic acid structure has its bases methylated after synthesis? (A) DNA (B) mRNA (C) tRNA
• 14. Which of the following is not required for both DNA replication and RNA transcription? (A) DNA (
• 15. Proximity-ligation assays are used to detect a specific (A) DNA. (B) RNA. (C) protein-protein in