資訊推薦

• 12. 要利用戴維寧定理計算電路的總電阻時，對於電流源要如何處理？ (A)視為短路 (B)視為斷路 (C)視同電阻 (D)不予理會
• 13. 一交流負載其電阻和電抗之比為12:9，已知其視在功率為30kVA，則它的有功功率P和無功功率分別為 (A)12kW/9kvar (B)9kW/12kvar (C)18kW/24kvar (D)
• 14. 電源星形聯接時，在相電壓對稱情況下，三個線電壓也對稱，且線電壓比它們所對應的相電壓超前相位角多少度? (A)60 (B)90 (C)30 (D)120
• 15. 在電路中無效功率(感應功率)是由何種RLC元件所產生？ (A)電阻 (B)電流 (C)電感(D)電荷
• 16. 交流電路發生諧振時，電路呈何種性質？ (A)電容性 (B)電感性 (C)頻率性 (D)電阻性
• 17. 某一個交流電路中，其負載為三相對稱型電感負載，採用三角形接法，電源為220伏特，相功率為4.84千瓦，功率因數為0.8，其負載相電流為多少？ (A)15.8A (B)47.6A(C)27.5A
• 18. 對於變壓器而言，輸入電壓及輸出電壓的比值與一次側及二次側的匝數比為？ (A)等比例 (B)反比例 (C)不同比例 (D)等比例的平方
• 19. 下圖之電路，V=30伏特，： R1=15Ω,R2=30Ω,R3=10Ω,其戴维寧等效電阻為多少Ω(A)20 (B)30 (C)45 (D)50
• 44. =？(A) (B) (C) (D)
• ▲閱讀下文，回答第 19-20 題 在實驗室中製取氮氣的方法之一，就是共熱亞硝酸鈉與氯化銨的混合溶液，利用了亞硝酸銨的分解反應來產生氮氣。銨離子()在水溶液中與亞硝酸根離子() 的反應方程式為，某學生
• 32.設燃油之化學式為 ，則完全燃燒之化學反應式為 ，則式中之( C )應為下列何者?(A)n (B)m (C)n+m/4 (D)m/2
• 2. Find the relative extrema of the function . Round your answer to one decimal place. (A) Relative
• 3. Chen Shu-Chu is a person of _______ character. Although she is just a vegetable vendor, she donat
• 2. You should dress up yourself on this formal __________. To show respect to the host, no slippers
• 4. In the Indian culture, cows are thought to be _______ animals. They are respected in religious ac
• 6. The capable student was ________ the chairperson of the Student Association. He will be in charge
• 5. You will get sunburned if you are ________ to the scorching sun for too long without applying sun
• 7. Feeling like an outsider in the family, John doesn’t know how to chat with his siblings easily an
• 10. On Christmas Eve, all flights were cancelled _______ the heavy snowstorm. Many tourists were dis
• 8. Our homeroom teacher was _________ when she knew two students skipped class and smoked on campus.
• 9. After the cruel murder, all the elementary schools should take measures to ________ anyone suspic
• 11. The novelist ________ many speech invitations to concentrate on writing his next new novel.(A) b
• 13. It is dangerous for us to ________ without grasping the whole picture. We need to clarify all th
• 12. The supervisor plans to talk to his team ________ the meeting. He thinks a pre-discussion is nee
• 16. Astronauts will experience loss of appetite at the beginning of their time in space because thei