课程名称︰电路学 课程性质︰大一必修 课程教师︰吴忠帜 开课学院：电资学院 开课系所︰电机系 考试日期（年月日）︰2019/5/9 考试时限（分钟）：1 hour 试题 : 1. (35%)Please use nodal analysis to determine the output voltage vo(t) shown in Fig.1 with the current source is(t) = 2cos(50t+30) A https://imgur.com/7j3ZWax.jpg 2. (30%)For the circuit shown in Fig.2, please use superposition to determine: (a) node voltage VA (20%) (b) source current Is (5%) (c) draw the phasor diagram of VA, Is, and Ic (5%) 3. (35%)As shown in Fig.3, the 60Hz voltage source Vs supplies the power to an induction motor load via a transmission line with (1 + j50) Ω. The induction motor is operated at an rms value of 200∠0 Vrms and 40kW with power factor 0.707 lagging. https://imgur.com/LuxJi0X.jpg Please determine: (a) the voltage source Vs at rms value (10%) (b) the average power supplied by the voltage source (5%) (c) the efficiency of the system (5%) (d) the capacitance needed at terminal AB to improve the load power factor to 0.95 lagging (10%) (e) the values of the source current Is before and after the capacitor is connected (5%) --

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