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- The Full-looad and No-load of a regulator are 5.2V and 5.3V, respectively. Then the % load regulation is а. 0.1% b. 2.63% C. 1.92% d. 5.3%For the series circuits of the figure below, calculate the total impedance (ZT). R1 4 k2 XL1=4 k2 ZT Xei= 6 k2 Xc2= 3 k2 XL2= 4 k2 Z7= 17.4 kn, the angle is 76.7° Ob. Z7= 17.4 kn, the angle is 56.3° .Oc. Z7= 4.1 kn the angle is -14° Od. Z7= 7.2 kn the angle is 56.3°Desian aproblem for wye delta transform adions Determinc the eauivalend resistance between the terminals A andA B.
- Given the following phase currents: Ia= 3.5+j3.5; Ib=-j3; and Ic+-2.6+j1.5. Determine the negative sequence current for phase A. A. 0.313+j0.678 B. -0.313 -j0.678 C. -0.313+j0.678 D. 0.313-j0.6782. Two transformes A and B of ratings 5uokVA and 25okVA. Supplying a load kVA of 750 ato.8Pf lagging. open circunt valtajes are 400V and 410v respectively. Trusfarmn A has 1/ nsistance and 5/ ractance and traugformer B hay 1.$, mesistona and 41 reactance. Find (^) Crossacarent in the seandaries on no.load.ib) the load shared by euch transfarmer Their areProblem 10 – Transformation [6] A delta and star configuration shown in Figure 7. Transform the delta connection are to a star and determine the values impedances: (a) ZA (b) ZB (c) Zc of the following Z CAS zZAB wi B Impedance in polar notation. 2 BC Figure 7 ZAB = 27.3L0° Q ZBc = 27.3L-30° Q ZCA = 27.3L 30° Q
- A 220 Ω resistor is in series with an 80 mH inductor. The AC source is 48 at 1 kHz. The power factor is ________. Hint: Draw the circuit and get Vs and IsUse the information below to answer questions 24 und 25. The voltage across and the current through a load are (10+ j5Y and (2-jiArespecively. 24. What is the reactive power in VArconsumed? D. 0 A. 15 C. 20 D. 25 25. What is the pawer factor of the load? A. 0.8 leading B. 0.8 Jagging. -D. 0.6 ligging C 0.6 leadingProb. I and Vc For the following RMS phasor circuit, a coworker has determined values for 50 Ohms 50 Ohms i,- 225 2253.13° = 190.92 + 254.56 VRMS R1 + R2 Vc = 237.17/26.565° = 212.13+ 106.07 VRMS 100 2 -3Z98.13° =-0.4243 + J2.970 ARMS C -j60 Ohms For this problem provide at least 3 digits of precision for the answers. The results for the following calculations are to be answered in - a) Find the current I b) Determine the real (P) and reactive(Q) power DELIVERED by the source c) Determine the real (P) and reactive (Q) power ABSORBED by each impedance ( resistors R1 and R2, inductor and capacitor). The values for P and Q can be positive or negative. Remember S =P+jQ, so do not include the j with your answer for Q. Each of these answers will require two parts. For the phasor a magnitude and angle will be needed. For the powers, The real power P and the reactive power Q are required.
- The instantaneous power absorbed by the load in a single-phase ac circuit, for a general R LC load under sinusoidal-steady-state excitation. is (a) Nonzero constant (b) Zero (c) Containing double-frequency componentsI PERFORm THE FOLLOWING OPERATIONS. (EXPRESS THE ANSWERS IN RECTANGULAR PORM, & Stow THE COMPLET SOLUTIONS). a) (4+j3) C6-je). (34j3) -(2+j3) c) (6 /20°.) (201-46")sjs) 2 30° 2. 860 140 Q LO) +J00 tj400) 3tj9A 100-MVA synchronous generator supplies 62.5 MVA of power at 0.8 lagging power factor. The reactance between the load and the generator is normally 1.0 pu, but it increases to 3.0 pu because of a sudden three-phase short circuit. The fault is subsequently cleared and the generator then supplies 43.75 MVA at 0.8 lagging power factor. Determine the critical clearing angle. Select one: a. 88.58 b. None c. 78.58 d 68.58