資訊推薦

• 39. 如圖【8】所示之理想稽納(Zener)二極體電路，若 Vs = 18V ，則該電路之稽納二極體功率規格至少應為何？ (A) 225mW (B) 180mW (C) 170mW (D) 130M
• 40. 電晶體各接腳區的摻雜濃度之關係為 (A) E＞B＞C (B) B＞E＞C (C) C＞E＞B (D) E＞C＞B
• 41. 某電路能允許信號中的高頻成份通過，抑制低頻或直流成份，則此電路為何種濾波器？ (A)低通濾波器 (B)高通濾波器 (C)帶阻濾波器 (D)帶通濾波器
• 9.As viewed from the angle indicated, draw the Newman projection of the conformer of the following c
• 42. 試問下圖【9】為何種電子元件？(A) NPN電晶體 (B) PNP電晶體 (C) MOSFET (D) P-N二極體
• 43. 在製作電晶體時，單一顆電晶體無法代替下列何種元件？ (A)電阻 (B)二極體 (C)電容 (D)電感
• 44. NPN型BJT工作於飽和區時，下列敘述何者正確？ (A)集極電流與基極電流成正比 (B)適合作為訊號放大 (C)相同集極電流下，BJT消耗功率比工作於主動區小 (D)基-射極與基-集極間均為逆
• 45. 電晶體交換電路的速率，主要是由什麼極所儲藏的少數載子放電速率來決定？ (A)基極 (B)射極 (C)集極 (D)集極和射極
• 46. 有一電晶體放大電路，其電壓增益、電流增益、功率增益皆高，且輸出電壓與輸入電壓 相差180°。請問是屬下列何種放大電路組態？ (A)共射極放大器 (B)共集極放大器 (C)射極隨耦器 (D)共基
• 47. 有射極隨耦器之稱的電晶體組態是 (A)共基極電路 (B)共射極電路 (C)共集極電路 (D)共汲極電路
• 48. 關於共基極的參數描述，下列何者正確？ (A) Zo很小 (B) Zi很大 (C) Av ≈ 1 (D) Ai ≈ 1
• 49. 增強型n通道MOSFET若工作在主動區則 (A)閘汲極正電壓，閘源極正電壓 (B)閘汲極正電壓，閘源極負電壓 (C)閘汲極負電壓，閘源極正電壓 (D)閘汲極負電壓，閘源極負電壓
• 50. 如圖【10】所示為555之無穩態多諧振盪電路， 試問充電路徑包含哪幾個元件？ (A) R2及C (B) C (C) R1及R2 (D) R1及R2及C
• 10.For the following reaction sequence, which molecule is expected as the major product? (A)(B)(C)(
• 11.Examine the transforration shown below and then indicate which of the following statements is cor
• 12. A professor wanted to invent a C-H oxidation reaction, in which n-pentane could be oxidized to g
• 13. A graduate student found four reagent vials (I, II, III, IV) with unclear labels. A lab manager
• 14. One of the following chloronorbornanes undergoes E2 eiimination much faster than others. Conside
• 15.A student reported that an acid (H+X- ) promoted a reaction of the epoxide to give a product. By
• 16. Based on your knowledge of current organic chemistry, which of the following reactions leads to
• 17. What is the major product for the following reaction? (A)(B)(C)(D)(E)
• 18. Which of the following reactions will NOT give a ketone as a major product? (A)(B)(C)(D)(E)
• 19. Which of these reactions will NOT give a phenol as a major product? (A)(B)(C)(D)(E)
• 20.Which one of the listed compounds is consistent with the following NMR spectrum?(A)(B)(C)(D)(E)
• 21. Which pair of reagents would produce the highest yield of (R)-2-ethoxybutane? (A)sodium (S)-2-bu