5. A 380V, 10HP, four- pole, 60 Hz, Y- connected three phase induction motor has a full-load slip of 3 percent. Find the synchronous speed of this motor and the rotor speed of this motor at the rated load. (11%)

6. A 50 KVA, 2200: 220 V, 60 Hz distribution transformer has a leakage impedance of 0.62 + j 1.02 ohm in the high voltage winding and 0.006 + j 0.01 ohm in the low voltage winding. At rated voltage and frequency, the admittance of the shunt branch accounting for the exciting current is 0.003 - j 0.02 mho when viewed from the low voltage side. Draw the equivalent circuit referred to the high voltage side. (11%)

7a. A sine wave and triangle wave have the same (positive and negative) amplitude. The RMS value is the same for both waveforms. [2 pts]

7b. Average power is equivalent to real power, and RMS power is equivalent to reactive power. [2 pts]

7c. For a periodic waveform, the average valuc will always be the same or lower than the RMS value. [2 pts]

7d. For a periodic waveform, the maximum theoretical value for total harmonic distortion (THD) is 1. [2 pts]

7e. In the square-wave shown below, the amplitude of the fundamental' component is larger than A. [2 pts]

7f. The total harmonic distortion (THD) of a pure square wave (50% duty) is the same regardless of frequency and amplitude. [2 pts]

7g. For a diode rectification circuit with a resistive and inductive (R-L) load, the instantaneous output voltage (over the load) may become negative. [2 pts]

7h.Th. For an ideal buck converter operating in disco ontinuous conduction m node (DCM), the input- to-output voltage relationship does not depend on the output capacitor value C. [2 pts]

7i. A half-bridge inverter creates 2 different voltages over the output, while the full-bridge inverter creates 4 different voltages over the output. [2 pts]

110年 - 110 國立臺灣大學_碩士班招生考試_電機工程研究所乙組:電力工程(含電力系統、電機機械、電力電子)#101255

109年 - 109 國立臺灣大學_碩士班招生考試_電機工程研究所乙組:電力工程(含電力系統、電機機械、電力電子)#105857