Question i. Show that the power factor for a controlled full-wave rectifier with a resistive load is sin(2a) pf = T ii. The controlled single-phase rectifier full-wave bridge rectifier of Figure 2 has an RL load with R = 25N and L 50mH. The source is 240 V rms at 60 Hz. Determine = the average load current for a = 15° and a = 750 R V, (or) = Vm sin(ot) Vo Figure 2

(b) Discuss the impact of connecting a large capacitor filter across the load in Figure Q1(ii). Use appropriate waveform sketch to aid your discussion. + Vp - Us R2 RL Vs ( (i) (ii) Figure Q1. Single phase half bridge rectifier: (i) with a Thyristor (ii) with a Diode

3-phase-demos-3vi File Edit View Project Operate Tools Window Help Waveform Chart 8 21 2- 18- 16- 14- 12- 1- 08- 06 04- 02- 0 -02- 04- -06- 08- -1- -12- 14- Time རྔ་ལྷ་ལྟ་ Amplitude Time A-B (D1, DS) A-C (D1, D6) B-C (D2, D6) B-A (D2, D4) C-A (D3 D4) C-B (D3, D5) A-B A-CA B-C B-A C-A C-B KKKKKK 081 -0.92 -1.73 081 0.92 1.73

You are an electrician working on an overhead crane. The crane uses a large electromagnet to pick up large metal pipes. The magnet must have a minimum of 200 VDC to operate properly. The crane has an AC source of 240 V. You are given four diodes that have a peak voltage rating of 400 V each. These diodes are to be used to form a bridge rectifier to convert the AC voltage into DC voltage. Is the voltage rating of the diodes sufficient? To the nearest volt, what will be the DC output voltage of the bridge rectifier?