1) A three-phase half wave controlled rectifier is operated with a 17kVA, 460V Y connected transformer. If the load resistance is 10 2, a) Calculate the firing angle required to obtain 75% of maximum possible de voltage. b) Average current and RMS current(use basic definition and integration for RMS value) c) Average and RMS current of the SCR.

Q 3. The single-phase half-wave rectifier is supplied directly from a 120-V (rms), 60-Hz source through a step-down transformer with turns ration 10 : 1. The load resistance RL, is 10 N. Determine (a) the average output voltageVolav), (b) the average load current I(av), (c) the rms load voltage Volrms), (d) the rms load current I(rms), (e) the ripple factor RF of the output voltage, (f) the rms ripple voltage Vr(rms), (g) the average diode current Ip(av), (h) the rms diode current Ip(rms), (i) the peak inverse voltage PIV of the diode, (j) the average output power Po(AC), (k) the DC output power Po(DC), and (I) the frequency fr of the output ripple voltage. (

5. For the transformer coupled half- wave rectifier circuit shown below: detei peak secondary voltage of the transformer 4:1 120V, 60H3 R. 2.5KL

Consider the full-wave rectifier circuit shown below, where• vS(t) is a sinusoidal signal with a peak value (Vs = 5 V).• Diodes are modelled using constant voltage model with VDO = 0.7 V• The ac line voltage has an rms value of 120 V and a frequency (f) = 60 Hza) Calculate the transformer turns ratio.  b) Plot in the same graph signal vS(t) and the output signal vO(t) versus time (t) (show all details including amplitudes, time instances, etc.) c) Calculate the rms value of the output signal vO(t). (hint: sin2(x) = 0.5(1- cos(2x)))  d) If a capacitor C=3.58 F is connected across R = 10 k, repeat (b) in a new graph