(d) Please find V_c and i_c during discharge (4%).

(e) Please estimate how long will the transient last. (4%)

6. In Fig. 6, please find ZL for maximum average power transfer and please compute the maximum average power supplied to the load. (10%)

1. A 380 V, 20HP, 60 Hz four-pole Y-connected three phase induction motor has the following impedances in ohms per phase referred to the stator circuit: R1 =0.6 ohm, Xl = 1 ohm, R2=0.3 ohm, X2 =0.45 ohm, (magnetizing reactance) =25 ohm. The total rotational losses are 1000W and are assumed to be constant. The core loss is neglected. For a rotor slip of 2 percent at the rated voltage and rated frequency, find the motor's stator current. (10%)

2. The synchronous reactance for a round rotor synchronous generator is 1.0 and the armature resistance is negligible. Find the real power delivered by the generator when the terminal voltage is and the open-circuit voltage is(10%)

(a) Compute the per unit values for the resistances and leakage reactance for the two windings. (10%)

(b) When the low voltage winding delivers power to a load of 20KW, 0.9 power factor lagging at 200V, find the per unit voltage at the high voltage side. (6%)

4. Given the 60 Hz, balanced three-phase system shown below, find when(10%)

5. Assume tha . Find the maximum value for (10%)

6. The radius of each sub-conductor is 1 cm for the following 345 KV, 60 Hz, completely transposed balanced three phase lines. Find the per phase inductance In H/m and per phase capacitance to neutral in F/m. (10%)

(a) How many modes if the converter operates in continuous conduction mode (CCM)? Draw the equivalent cireuit of each mode. (4%)

110年 - 110 國立臺灣大學_碩士班招生考試_生醫電子與資訊學研究所甲組:應用電子學(含電路學、二極體、電晶體及基本電路、放大器)#101254