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SULIT UNIVERSITI MALAYSIA PERLIS Peperiksaan Akhir Semester Dua Sidang Akademik 2011/2012 June 2012 EKT 308 Modern Control System [Sistem Kawalan Moden] Masa: 3 Jam Please make sure that this question paper has ELEVEN (11) printed pages including this front page before you start the examination. [Sila pastikan kertas soalan ini mengandungi SEBLAS (11) muka surat yang bercetak termasuk muka hadapan sebelum anda memulakan peperiksaan ini.] This question paper has SIX (6) questions. Answer any FIVE (5) questions only. Each question contributes 20 marks. [Kertas soalan ini mengandungi ENAM (6) soalan. Jawab mana-mana LIMA (5) soalan sahaja. Markah bagi tiap-tiap soalan adalah 20 markah]
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SULIT (EKT 308) SULIT -2- Question 1 [Soalan 1] (a) Feedback is an important process in control system engineering. Briefly explain feedback with a relevant diagram. [Suapbalik adalah satu proses penting dalam kejuruteraan sistem kawalan. Terangkan secara ringkas tentang suapbalik dengan rajah berkenaan.] [2 Marks / Markah ] (b) Briefly comment on the positive features of the feedback of a control system. [Komen secara ringkas tentang sifat-sifat suapbalik dalam sistem kawalan yang baik.] [3 Marks / Markah ] (c) Consider the block diagram of a control system shown in Figure 1.1 [Pertimbangkan gambarajah blok sistem kawalan dalam Rajah 1.1] Figure 1.1 [Rajah 1.1] i) Determine the overall transfer function of the system. [Tentukan fungsi rangkap pindah sistem ini.] [3 Marks / Markah ] ii) Show the poles and zeros of the system in the s-plane. [Tunjukkan kutub dan sifar sistem tersebut dalam planar s] [2 Marks / Markah ] (d) An electrical circuit is shown in Figure 1.2. [Satu litar elektrik ditunjukkan dalam Rajah 1.2] i) Determine transfer function 𝐺 𝑠 = 𝐼 ( 𝑠 )/ 𝐸 ( 𝑠 ) of the electrical system. [Tentukan fungsi rangkap pindah 𝐺 𝑠 = 𝐼 ( 𝑠 )/ 𝐸 ( 𝑠 ) sistem elektrik ini.] [6 Marks / Markah ] ii) If a unit step is applied to the system as input, evaluate output of the system.
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