[Q3) Consider the circuit shown in Fig. 3, where both the resistance R and the reactance X are variable. Answer the following questions. (1) The circuit on the left side of the terminal pair 1-1' in Fig. 3(a) is equivalent to the circuit in Fig. 3(b). Find the voltage Eo and the impedance Zo. (2) When the power consumption P at the re- sistance R is maximized with respect to R and X, find the maximized power con- sumption Pmax and the values of R and X. JD-je= Eo ΖΩ (a) Zo (b) Fig. 3 -jn 1' 1' R jX

B) A 3 phase full converter shown in fig.4 supply an inductive load with ripple free current. By assuming VyB= Vml sin wt and a=60° the following load voltage is obtained . Find x1,X2 and x3 I. P2 P3 R Y B N2 Ng Fig.4 X2 X3 2n 2n ot Output voltage wave form

Calculate the average and the root-mean-square value of the output voltage for the network in the figure below. Assume (VDI=VD2=0.5V) 10 V D2. D1 2k2 I t 3k2 3 k2 O 2.417V, 2.687V 2.421V, 2.736V 2.536V, 2.657V 2.173V, 2.824V O 2.517V, 2.876V O 2.714V, 2.766V

Fundamentals of Electrical Engineering 2020/2021 Dr. Yaseen H. Tahir Example: Rind the current lo in the network in Figure below. 6 kN エY 2V. V,, 12 kn V3 12 kn 6 kN Sv, 6 V Solution:bebni ghaonil (1-V mdh lleas eldong aidtsloo ab etlov sbon oors19ionnos (1- onib oi beriupon s il own bon ow(E-Vs.) asbon oerit asdowor o sonie lobo sd to sno worlomoa ti terb sion oanoups insbgobn pobrogabri onil ow st lo ono i noisu oistane ien tobianoo J enlov shon sh ani b eben +12 Aind

Exeras: 1. Be rebistance of a sm length of oire is cön sr. Detia) the resitance of an8m longth of the same wire, b) the ength of the seme wine when the res tfonce is 4W s. 2. A Piece f re of crss-cfisndd area 2 muy go0 sr. Finid the rebutance of a wie of the some length and maferial if the crss secfional area s SMm. b). the crosss so area of the wire of the some length ond maeriol of resisfance soD2 3. A oril cons o turns of oopperwirehaving a cm-seton area of 0.8 mmn, The maan Lengtb perfurn is s0 čm anithe nosiãfivity of Cu s 0.02 um. Finh the resistonca of the coil ond pwer absorbed 4. An aluminum wire 7.5m. Lang is consacfed parallel writha copper 201ire de m larg. uhen a curent of rdix passd throngh the Cmibination, iř in fannl tht the curent the aluminung wire ik 3Aup The diamefer of the alumsinum wire is 1,0 mm. Defermane the diamefer of the copper wire. has rebi tance of by the cril when camecfed acm8 110V&c supply?

11 Consider the following circuit used to provide power for an inductive RL load. The input voltage is Vs=150V and the load has a 30 impedance value. The thyristor is working at a frequency fs = 2 kHz. The discharge current is to be limited to 50A and the required dv/dt is 50V/us. If the value of Cs is equal to 0.158µF, then the snubber losses are equal to: put of question T: T R Vs Select one: O a. 4.56W O b. 2.56W Oc. 5.45W Od. 3.56W

For the circuit below, determine the circulating current and the voltages across each component. Draw a phasor diagram of the three component voltages. Also find the time delay between the voltages of the components (VR, VC).

4 - Which of the following is true regarding Kirchhoff's Rules?I. Joint Rule, the current from a node in the circuit tells us that the sum of the current from the node.II. If we pass an emf source in the circuit in the direction of the emf, the potential change we will get for Kirchhoff's voltage rule is +V.III. If we pass an emf source in the opposite direction of the emf in the circuit, the potential change we will get for Kirchhoff's voltage rule is +V.    A) Only I  B) II and III  C) I, II and III  D) Only II  E) I and II

The three-phase phase voltages in the 3- phase thyristor rectifier circuit in the figure are as follows Ts T: A Ts a Van = V m sin (314t + 0°) V bn = Vm sin (314t – 120°) Ven = Vm sin (314t – 240°) Van Vea A T: A T: taking into account the network phase- to-phase voltage waveforms given below VAC VBC VCA VCB AB BA св Vm -Vm O 15 30 45 60 75 90 105 120 135 150 165 180 195 210 225 240 255 270 285 300 315 330 345 360 a) Write the Natural Trigger Angles for Thyristors in the rectifier circuit in the spaces below with values between 0-360 degrees (example: 30, 330 ) Response rating for T1? Response rating for T2 ? Response rating for T3 ? Response rating for T4 ? Response rating for T5 ? Response rating for T6 ? b) In cases where a=75° for the thyristors in the above rectifier circuit, specify the Switches in Conduct for the following ranges in the rectifier output voltage. In the range of 45° to 90°.? keys are in transmission. Between 165° and 195° .? keys are in transmission. In the range…

Task 3 A three phase, four wire star connected load consisting of: ZR: a resistor of 9500 in series with a 3H inductor ZB: a resistor of 1950 ZY: a resistor of 1950 in series with a 4µF capacitor Using the equipment available in the power lab (Room T017), connect the given load to a three-phase supply available in the lab and: 3.1. Determine the current of each line and the neutral current and measure the total power supplied by the source. 3.2. Analytically, calculate all currents and the total power and compare with those obtained in measurements. 3.3. Device a method and measure the waveform of the neutral current. Discuss the obtained waveform and the reason for any distortion in the waveform 3.4. Validate your calculations using computer simulation