A 3 phase half wave controlled rectifier has a 3 phase line to line supply voltage of 416 V rms at 50 Hz for 13 ohm and 2 H load. If the average output voltage is 210 V then __________________ is the firing angle for this condition.   Answer

3-phase half wave controlled rectifier is fed from 3-phase, 250V, 50HZ source and is connected to resistive load taking a constant current of 20A. (a) Draw the waveform of output voltage. (b) Calculate average value of load voltage for a firing angle of 20° (c) average load power.

The time period of the output voltage of a single phase bridge rectifier is 25/3 ms. The supply frequency will be _____ Hz.

Q4 / three phase half wave controlled rectifier is used to feed a resistor load of ( 10 ohm) the source is (208 volt) star connected: calculate: 1- The average value of the voltage and current on the terminal load if angle (45). 2- The average of the voltage on the terminal load if angle (80). 3- The angle required to get 7 amp. 4- Draw the circuit.

Question (2) A controlled half-wave rectifier has a 240 V rms 60Hz ac source, The load a is R=30 Ohm resistor (a) Determine the delay angle such that the average load current is 2.5A (b) Determine the power absorbed by the load (c) Determine the power factor.

Q1. A 3-phase full wave controlled rectifier is fed from 3-phase, 400V,50HZ source and is connected to load taking a constant current of 35A. (a) Draw the waveform of output voltage. (b) Calculate average value of load voltage for a firing angle of 20 (c) average load power.

Question (2) A controlled half-wave rectifier has a 240 V rms 60Hz ac source, The load a is R=30 Ohm resistor (a) Determine the delay angle such that the average load current is 2.5A (b) Determine the power absorbed by the load (c) Determine the power factor.

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.