A three-phase six-pulse rectifier shown in Figure Q1b is used to power a highly inductive load. The AC input voltage VL is 415 Vand frequency is 50 Hz. The semiconductor switch triggering angle is 45° and the (b) load current is 11 A. Calculate: (i) The output voltage (in Volt). (ii) The output power (in Watt). (iii) The firing angle a that provides output voltage equal to 255 V. (assume load current is constant and supply inductance is 4.5 mH/phase). (iv) The commutation angle u for the case in part (iii). (v) The RMS value of fundamental component in the input current (in Ampere). (vi) The 5th and 7th harmonic currents (in Ampere). io = I, la Vab IT3 Highly inductive Vo + load Vhc ip3 ADI IDI D2 Figure Q1b Three-phase rectifier.

The power output of the half-wave rectifier is rated at 6.4 W with a load resistor of 10 ohms. The peak voltage at the output is:

Find Vpc if VAN = VBn = Vcn= 120 volts... Half-wave Three-phase Rectifier Conduction Waveform Periodic Time (T) A B A 90° 180° 360 450° 540 time 270° -V VAN VeN VaN VaN VEN Voc4 Voc 150 120° 270 390 510° time 30 Output Voltage Waveform

A 60 Hz sinusoidal voltage is applied to an SCR full-wave rectifier. If the DC output voltage is 162 V and the firing angle of the SCR is 60 degrees, the peak voltage of the input sinusoidal would be: O A. 197 V O B. 228 V O C. Can't tell; need more information. O D. 340 V O E. None of the other choices are correct