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A: THD stands for total harmonic distortion. It is a measure of harmonics on AC side of converter.
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A: “Since you have posted a question with multiple sub-parts, we will solve the first three sub-parts…
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A: Fig. 1 Shows the circuit of a circuit of a three-phase bridge inverter with star-connected load.
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- Which termination would result to a phase change of 180 degrees at the load if Zo = 100 ohm? a. 50 ohm b. short circuit c. 75 ohm d. all of these What is the purpose of impedance matching? a. maximum return loss b. maximum SWR c. maximum load power d. maximum reflection A short piece of transmission line that may be open or shorted and used for impedance matching purposes. a. converter b. decoder c. stub d. transformerAn8pole50Hz,threephaseinductionmotorrunsataspeedof720rpm whendeliveringfullloadtorque.Itsstandstillrotorresistanceandreactance are0.1ohm and0.6ohm perphaserespectively.Anadditionalresistanceof 0.5ohm perphaseisinsertedintherotorcircuittocontrolthespeed. Calculatethespeedatwhichthemotorrunsnow withfullloadtorque remainingthesame.5.5 kW, 1450 rpm. L-type equivalent circuit and parameters for a continuous sinusoidal phase of a star connected 3-phase ASM with line voltage 220 V and frequency 50 Hz are given as follows, ignoring core (iron) losses: R1=0.21 Ohm, R2=-0.18 Ohm, X1=X2-0.66 Ohm and Xm = 9.9 Ohm How many times the inrush current will be the rated current when the ASM is started directly? Answer options group 8.0815 2.6455 4.3763 7.1534 1.2558 6.3414 5.2280 3.7473
- 1-Which function we call for three phase short circuit occurs in synchronous generator armature terminals at no load condition a.symshort b.lgfault c.llfault d.symfault 2-The FACTS devices support to control a.susceptance b.reactive power c.real power d.apprant power15. A symmetrical 440-V, 3-phase system supplies a star-connected load with the following branch impedances: Zr=100 Ω, Zy=j5Ω, Zb=-j5Ω. Calculate the voltage drop across each branch and the potential of the neutral point to earth. The phase sequence is RYB. Draw the vector diagram. [18800∠-30, 84152∠-315°, 8420-∠-28.5°, 8545∠150◦] AnswerUse Millman’s theorem and determine the magnitude of the neutral displacement voltage,(Vsn) in the phasor form. Use Millman’s theorem and determine the phase voltage (Vbs) of the load in polar form. Use Millman’s theorem and determine the phase voltage (Vbs) of the load in polar form. Use Millman’s theorem and determine the current,(Ib) in phase b of the load in phasor form. Use Millman’s theorem and determine the current,(Ib) in phase b of the load in phasor form. Use Millman’s theorem and determine the reading on the wattmeter connected in line B of the circuit.
- Consider a 10 kVA, 200/400 V, 50 HZ: single-phase tranformer has the folloving test results:0.C. test: 200 V, 0.6A, 63 W (L.V.side)S.C. test : 20 V, 25A, 85 W (H.V. side)Deternine:i- The eficiengy at 75 % offiull-load at 0.9 leading power factor.ii -The secondary terminal voltage on fill-load at tunity power factona shunt generator supplies a load of 5,500w at 110v through a pair of feeder conductors having a resistance of 0.02 ohm each. the armature, shunt field resistances are 0.15 ohm and 50 ohms respectively, find the emf generated.If a load is symmetric with 50 ohm of series impedance and 13 ohms of mutual impedance, what are the sequence impedances? a. z11 = z22 = 63 ohm, z33 = 89 ohm, else 0 b. z11 = z22 = 33 ohm, Z00 = 76 ohm, else 0 c. z11 = z22 = 50 ohm, Z00 =89 ohm, else 0
- Can you explain the theory behind why the inductor in phase R and phase B become in series when phase Y is disconnected? And why do the voltage of phase R and phase B become to be equal to line voltage of 400V if phase Y and Neutral are short circuited?Use WYE-DELTA or DELTA-WYE Transformation if necessaryA440V,22.5-hp,50Hz,3-phase,4-pole,star-connectedinductionmotorhasthefollowing impedances in ohms per phase referred to the stator circuit:R1 = 0.55Ω R2 = 0.35ΩX1 = 1.105Ω X2 = 0.456Ω XM = 27.1ΩThe total rotational losses are 1105 W and are assumed to be constant. The core loss is lumped in with the rotational losses. For a rotor slip of 2.3% at the rated voltage and rated frequency, calculate:g) The shaft torque of the motor at rated load