# Exam_1 - indicating their angles Question # 2 For the...

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King Fahd University of Petroleum & Minerals Electrical Engineering Department EE205-02: Electric Circuits II MAJOR I Second Semester 2004-2005 ( 042 ) Instructor: Dr. Chokri Belhadj Ahmed Date Tuesday, March 22, 2005 Time 8:30 to10:30 PM Location Building 14-108 Student Name Student ID Question # 1 /40 Question # 2 /35 Question # 3 /25 TOTAL /100

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Question # 1 A) The delta connected load consists of three identical impedances 0f (8+j6) is supplied from a three phase, V AB = 208 0 o V source. If the sequence is positive, Draw the three phase load circuit and find 1) The load phase currents I AB , I BC , I CA 2) The line currents I aA , I bB , I cC 3) The total real power, the total reactive power and the total apparent. 4) The load Power factor B) Using V AB = 208 30 o V source and with the same positive sequence. The load is now to be connected in a Y connected balanced load. Each load phase impedance is (8+j6) . Find 1) The line currents I aA , I bB , I cC 2) Draw the phasor Diagram for all phase currents, phase voltages and line voltages

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Unformatted text preview: indicating their angles Question # 2 For the circuit shown below the switch has been open for long time before closing at t=0. For t < 0, find i L of the inductor = 20 mA and V c = 0 V of the capacitor a) Redraw the circuit at t= 0 + as a parallel RLC circuit step response form. b) Find i L (0 + ), di L (0+)/dt and the final value of the i L c) Find the neper frequency and the resonant frequency d) Calculate S 1,2 for the characteristic equation and specify the type of damping. e) Find i L (t) for t ≥ 0 Question # 3 For the circuit shown below (R a = 50 K Ω , C 1 = 0.1 µ F, R b = 100 K Ω , C 2 = 1 µ F, V cc1 = 9 V, V cc2 = 9 V, V o (0)= 0 V, V o1 (0)= 0 V, V g = 200 mV) a) Write the second order differential equation that describe the relation between the output voltage and the input source voltage b) Find V o (t) for t ≥ 0. c) How long does the circuit take to saturate. d) Does the first integrator saturate when the second saturates?...
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## This note was uploaded on 01/16/2010 for the course EE ee205 taught by Professor Profsyed during the Spring '09 term at King Fahd University of Petroleum & Minerals.

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Exam_1 - indicating their angles Question # 2 For the...

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