UNIVERSITI SAINS MALAYSIA. First Semester Examination 2013/2014 Academic Session. December 2013/January 2014 EEE 105 CIRCUIT THEORY I [TEORI LITAR I]

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UNIVERSITI SAINS MALAYSIA First Semester Examination 2013/2014 Academic Session December 2013/January 2014 EEE 105 CIRCUIT THEORY I [TEORI LITAR I] Duration : 3 hours [Masa : 3 jam] Please check that this examination paper consists of TEN (10) pages of printed material before you begin the examination. [Sila pastikan bahawa kertas peperiksaan ini mengandungi SEPULUH (10) mukasurat bercetak sebelum anda memulakan peperiksaan ini.] Instructions: This question paper consists of FIVE (5) questions. Answer ALL questions. All questions carry the same marks. [Arahan: Kertas soalan ini mengandungi LIMA (5) soalan. Jawab SEMUA soalan. Semua soalan membawa jumlah markah yang sama.] In the event of any discrepancies, the English version shall be used. [Sekiranya terdapat sebarang percanggahan pada soalan peperiksaan, versi Bahasa Inggeris hendaklah digunapakai.] 2/-

-2- [EEE 105] 1. (a) Anda diberikan dua bahagian untuk satu litar lengkap seperti yang ditunjukkan dalam Rajah 1(a). Bahagian A adalah untuk disambungkan kepada bahagian B. Sambungan manakah yang akan menghasilkan arus yang lebih tinggi, sama ada di antara terminal dan atau terminal dan? Buktikan jawapan anda. You are given two parts of a complete circuit as shown in Figure 1(a). Part A is to be connected to part B. Which connection will produce higher current, either between terminal and or terminal and? Prove your answer. Bahagian A Part A Rajah 1(a) Figure 1(a) Bahagian B Part B 3/-

-3- [EEE 105] (b) Berdasarkan Rajah 1(b), dapatkan Based on Figure 1(b), find (i) Arus Norton pada terminal. Guna analisa jejaring. Norton current at terminal. Use mesh analysis. (ii) Rintangan setara Norton, pada terminal Norton equivalent resistance, at terminal (iii) Jika, cari If, find Rajah 1(b) Figure 1(b) 4/-

-4- [EEE 105] 2. (a) Dapatkan voltan untuk litar dalam Rajah 2(a) dengan hanya menggunakan konsep pembahagian arus atau voltan. (Jangan guna analisis nod atau jejaring) Determine the voltage for the circuit in Figure 2(a) by only the use of current or voltage division concepts. (Do not use nodal or mesh analysis) Rajah 2(a) Figure 2(a) (40 markah/marks) 5/-

-5- [EEE 105] (b) Dengan menggunakan analisis nod, dapakan voltan pada setiap nod dan kuasa yang dihantar ke sumber voltan bersandar dalam litar yang ditunjukkan dalam Rajah 2(b). By using nodal analysis, determine the voltage at each node and the power delivered to the dependent voltage source in the circuit shown in Figure 2(b). Rajah 2(b) Figure 2(b) (60 markah/marks) 6/-

-6- [EEE 105] 3. (a) Dapatkan, dan tenaga yang disimpan di dalam kapasitor dan induktor untuk litar ditunjukkan pada Rajah 3(a) dibawah keadaan. Determine, and the energy stored in the capacitor and inductor for circuit as shown in Figure 3(a) under conditions. Rajah 3(a) Figure 3(a) 7/-

-7- [EEE 105] (b) Litar dalam Rajah 3(b) menunjukkan satu sumber voltan tiga-fasa sambungan-y mengirimkan bekalan elektrik kepada beban seimbang tiga-fasa sambungan-y. The following circuit in Figure 3(b) shows a Y-connected three-phase voltage source supplying electricity to a balanced Y-connected three-phase load. (i) Kirakan arus-arus fasa I a, I b dan I c Calculate the phase currents I a, I b and I c (ii) Kirakan kuasa sebenar P dan kuasa regangan Q yang diterima oleh setiap beban. Calculate the real power P and reactive power Q absorbed in each load. Rajah 3(b) Figure 3(b) 8/-

-8- [EEE 105] 4. (a) Kirakan persamaan kompleks berikut dan berikan jawapan anda dalam format segiempat. Evaluate the following complex number and give your answer in rectangular form. (25 markah/marks) (b) Merujuk kepada Rajah 4(b), tukarkan litar domain masa berikut kepada litar setara domain pemfasa. Referring to Figure 4(b), transform the following time-domain circuit into the equivalent phasor domain circuit. Rajah 4(b) Figure 4(b) (25 markah/marks) (c) Kirakan arus I o dan berikan ia dalam domain masa. Calculate the current I o and express it in time domain. (25 markah/marks) (d) Kirakan voltan v o dan berikan ia dalam domain masa. Calculate the voltage v o and express it in time domain. (25 markah/marks) 9/-

-9- [EEE 105] 5. (a) Untuk litar di Rajah 5(a): For the circuit in Figure 5(a): (i) Kirakan arus Calculate the current (ii) Kirakan faktor kuasa bagi keseluruhan litar seperti dilihat oleh sumber voltan Calculate the power factor of the entire circuit as seen by the voltage source Rajah 5(a) Figure 5(a) 10/-

-10- [EEE 105] (b) Untuk litar di Rajah 5(b): For the circuit in Figure 5(b): (i) Kirakan kuasa sebenar P yang dihantar oleh sumber voltan Calculate the real power P delivered by the voltage source. (ii) Kirakan kuasa reaktif Q yang dihantar oleh sumber voltan Calculate the reactive power Q delivered by the voltage source Rajah 5(b) Figure 5(b) ooooooo