2. Draw the circuit diagram of linear voltage regulator for fixed output voltage using IC78xx and IC79xx. Describe its principle of operation at input voltage. increasing

A three phase fullwave controlled rectifier has an input voltage which is 480vrmsat 60hz. the load modelled as a series resistance and inductance with R=10ohm and l=50mH. determine the delay angle to produce an average of 50ain the load.

Análisis de rectificador onda completa Consider the capacitor-filter rectifier circuit as shown in Figure 1. The input is a single-phase source that is derived from a 220 Vrms mains. Tasks for analysis: (a) Rig up the circuit as shown in Figure land plot V andi versus time. (b) Why is there ringing on the current wave-form? (c) What is the series impedance of the circuitệ (d) Plot V and V. versus time. What is the ripple? How does ripple depend on load, capacitor C; and frequency of input wave-form? (e) Measure the current and voltage waveform across the rectifier diode. (f) Estimate the average and ms currents through the rectifier diode, Calculate the diode power dissipation. (g) What should be the peak current rating of the diode? (h) Change the initial charge voltage on the capacitor Cr. What is the effect on the input surge current? (i) Change the phase angle of the input V, at start up. Observe the effect on current i. What happens and why? 1) Under whaf conditions do you get…

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1. Calculate the theoretical output DC voltage of the half-wave rectifier circuit and compare it with measured value. For the capacitive filter, obtain the theoretical values of the DC output voltage and the ripple voltage and compare these values with the measured quantities. Determine also the practical and theoretical values of the ripple factor. 2. Calculate the theoretical output DC voltage of the center-tapped full-wave rectifier circuit and compare it with measured value. For the capacitive filter, obtain the theoretical values of the DC output voltage and the ripple voltage and compare these values with the measured quantities. Determine also the practical and theoretical values of the ripple factor. 3. Repeat the calculations for the full-wave bridge rectifier and filter circuit. 4. Determine the peak inverse voltage (PIV) on each diode in the three rectifier circuits. 5. If diode D4 in the bridge rectifier circuit of Figure 5 was removed or burned, explain the operation of…

a-Draw the cct Q1/(A) For the waveforms of s phase angle control Ac-Ac converter: - diagram and complete other waveforms. b- Derive the equation of V Mean and V Effective. c-If a л/6 compute the i/p P.F, average i/p current and o/p in this cct. (15M). Q1(B) Prove that the single phase half wave rectifier with load inductive that:- vdc= Vmax 2π [1+cos(+0)] (10M) Q2/(A) Design parallel inverter to generate square wave with frequency 400 Hz to supply resistive load 120 2,240 v, if the battery voltage 12. (15M) Q2/(B)What are the meaning of the following: - [choose five only] (10M) 1-PWM 2- Combined inverter 3-UPS 4- Triac. 5- Smart technology device 6-Switching mode regulator 7-Throsold v. Q3/(A) Three phase F.W.R is operated from a star connection 208v,60 Hz supply, RL=1002, this rectifier must supply a load of 40 2 at half its max. O/P v. Find: -1- Firing angle. 2-r.m. s and average o/p current 3- o/p frequency. 4- if the firing angle smaller than 60° 5-Draw the waveforms for all…

3 A peak rectifier (peak tollower) Cir cuit is gian below. Vs is a GOH3 Sinuscidal Vollge with peak value Upz50V. 50V. The load resistance R= Sk . Find the Vallke of the capacitance C Such that the peak- to-peak ripple 2 volts. (idenl diede) Voltage Vr Vs

Q3) A. A step down de chopper is connected to an R=52 and L=10 mH. The de supply voltage is 100 V. The chopper is switching at a frequency of 1 kHz with a duty cycle of 50%. Determine the load current, lo and the peak to peak ripple current as an absolute value and as percentage of de value.

Explain the concept of power semiconductor devices such as Insulated Gate Bipolar Transistors (IGBTs) and Thyristors. How do these devices enable efficient power control and switching in high-power applications?

6-If the collector resistance is shorted,the ac output voltage will a-Decrease. b-Increase. c-Remain the same. 9 d-Equal zero. 7-If input impedance of the second stage decreases, the voltage gain of the first stage will a-Decrease. b-Increase. c-Remain the same. d-Equal zero. 8-If the load resistance of second stage opens, the voltage gain of the first stage will a-Decrease. b-Increase. c-Remain the same. d-Equal zero. 9-The feedback resistor a-Increases voltage gain. b-Reduces distortion. c-Increases collector resistance. d-Decreases input impedance. 10-when the emitter resistance Rp doubles the ac emitter resistance a-Increases. b-decreases. c-Remains the same. d-Cannot be determined. 11-To reduce the distortion in a CE amplifier, reduce the a-DC emitter current. b-Base-emitter voltage. c-Collector current. d-AC base voltage. 12-The output voltage of a CE amplifier is a-Amplified. b-Inverted. c-180° out of phase with the input. d-All of the above.