複選題

27. 在印刷控制導表中，監測「灰色平衡」的主要功能包括哪些？
(A) 監控 CMY 三原色等量重疊後的色彩
(B) 判斷印刷過程中是否有色彩偏移現象
(C) 作為調整整體墨量平衡的參考基準
(D) 測量單一色墨的濃度值

複選題28. 關於印刷估價，下列哪些敘述正確？ (A) 1 磅約等於 453.6 克 (B) 紙張放損率通常會隨著印刷張數增加而降低 (C) 紙張令數的計算通常須包含成品用量與放損張數 (D) 印刷令數與版費無關，但與印色數及印刷張數相關

複選題29. 平版印刷中，金色油墨的顏色表現，主要取決於其含有的金屬粉末比例，包含： (A) 銅粉 (B) 鋅粉 (C) 鋁粉 (D) 鉛粉

複選題30. 關於印刷後加工的敘述，下列哪些符合一般雜誌或海報的製作流程？ (A) 上霧面 PP 膜可增加紙張耐磨性與質感 (B) 局部上光可用於強調特定視覺重點 (C) Trapping 是在印刷機上由師傅手動完成的 (D) 印刷後的摺紙方式會直接影響內頁的頁序安排

1. In the following cross-section figure, four straight current-carrying wires are devised out of the page. IA = I, IB = 3I, IC = 2I, ID = 5I If a counter-clockwise Amperian loop enclosing wire A only gives = -μ₀I, what Amperian loop would give= 4μ₀I? (A) A clockwise loop that encloses wires A, B and C only. (B) A clockwise loop that encloses wires B, C and D only. (C) A counter-clockwise loop that encloses wires A and D only. (D) None of the above

2. A circular coil with a radius of R has N turns. A uniform magnetic induction B = B₀sin(ωt) passes perpendicularly through the coil. What is the time-dependent electromotive force produced in the coil? (A) -NπR²B₀ωcos(ωt) (B) NR²B₀cos(ωt) (C) N²πR²B₀ωcos(ωt) (D) None of the above

3. There is a current distribution with the density of J₀ A/m² in the volume between the planes y=a and y=-a. What is the magnetic flux density in the region of -a＜y＜a due to the current distribution? (A)(B) (C)(D) None of the above

4. There is a common boundary in between two magnetic media with permeabilities μ₁ and μ₂ as shown in the following figure. The magnetic field intensity in the medium 1 at the point P has a magnitude H₁ and makes an angle α₁ with the normal, what is the angle α₂? (A) (B)(C)(D) None of the above

5. A rectangular metallic waveguide has dimension of a=3 cm and b=2 cm along x and y directions respectively. Now the waveguide is to transmit 12 GHz signal. How many guided modes can this waveguide support? (A) 1 mode (B) 2 modes (C) 4 modes (D) None of the above

6. A rectangular metallic waveguide has dimension of a and b along x and y directions respectively. Which of the following modes have the same cut-off frequency, assuming the dimensions a = 2b: (A) TE₀₁ & TM₀₁ (B) TE₂₀ & TM₀₁ (C) TE₁₁ & TM₁₁ (D) None of the above

7. Which of the following waveguide can support guided TEM mode: (A) Rectangular waveguide (B) Circular waveguide (C) Microstrip (D) None of the above

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