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 system. (15M) Q3(B)What are the power system conversion for any device and how controlled for all the (10M) system? Q4(A) Single phase H.W controlled rectifier with purely resistive load and trigger angle equal to find, 1- The rectification efficiency 2- The ripple factor 3- FF 4-The peak inverse voltage of the thy. 5-Distortion factor. Q4(B) 3 [choose One Only] (10M) 1- What are the steps involved in designing power electronics equipment? 2- What do the thyristor turn on methods and give the protection techniques for this device? Q5(A)/[choose One Only ] [ 10M] (15M) 1- Discuss the Cubb-fortescue method and what are the different with S.G method? Give examples for all methods. 2- What are the types of Inverters? And give me the applications of this with block diagrams? Q5(B) two converters are used in bipolar HVDC transmission system. The ac system is three phases;11kv;50 Hz;90A. The i/p transformers have a leakage inductance of 8. The inverter marginal is 18° and rectifier angle is 25°. Compute current in dc line; o/p rectifier; dc link voltage and p; reactive power in (A, B); EA, EB. (15M)