▶ A 25-KVA, 4000/400-V, 60-Hz transformer has the following parameters: ▶ R₁ =18 , XH = 25, R₂ 2, Xu = 180 m2, X₂ = 250 Χι m Ω, RcH =15 ΚΩ, and XΜΗ = 25 ΚΩ. ▸ If the open-circuit and short-circuit tests are performed on this transformer, what are the readings of the instruments in each case? > Voc= 400V; loc= 3.1A; Poc=1066.67W ос 1406.25W ос > Vsc= 385V; Isc= 6.25A; P, SC SC =

▶ A 25-KVA, 4000/400-V, 60-Hz transformer has the following parameters: ▶ R₁ =18 , XH = 25, R₂ 2, Xu = 180 m2, X₂ = 250 Χι m Ω, RcH =15 ΚΩ, and XΜΗ = 25 ΚΩ. ▸ If the open-circuit and short-circuit tests are performed on this transformer, what are the readings of the instruments in each case? > Voc= 400V; loc= 3.1A; Poc=1066.67W ос 1406.25W ос > Vsc= 385V; Isc= 6.25A; P, SC SC =

Introductory Circuit Analysis (13th Edition)

13th Edition

ISBN:9780133923605

Author:Robert L. Boylestad

Publisher:Robert L. Boylestad

Chapter1: Introduction

Section: Chapter Questions

Problem 1P: Visit your local library (at school or home) and describe the extent to which it provides literature...

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QUESTION 5 A real transformer is connected to a 120V RMS supply voltage on the primary and a 2.5knL40* load on the secondary. Np = 500, Ns = 1500, Rp = 100, Rs = 250, Xp = 40, and Xs = 200. Calculate the magnitude of the voltage across the load. O 463V RMS O 108V RMS O 285V RMS O 343V RMS
answer for the question. Which of the following conditions would be necessary in order for you to use an r-f transformer as a very sharply tuned band-pass device? OA. A series-tuned LC circuit must be connected across the secondary winding. OB. The primary and secondary windings should be overcoupled. O C. The primary and secondary windings must be shielded from each other. OD. A capacitor should be connected between the primary and secondary windings.
A 5 to 1 ratio, step-down 10 transformer has 230/460 V secondary voltages. The secondary winding being continuously wound but with the center tap brought out. Across one half of the winding is connected an induction motor drawing 50 A at 0.72 pf and 230 V. On the other half is connected an over-excited synchronous motor drawing 40 A at 0.9 pf and 230 V. (a) Determine the current thru the center tap (b) Assuming no-loss, determine the real power at the primary side 3.
Q 29
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Question-1 A complementary push-pull transformerless Class-AB power amplifier is driven from a single voltage source as indicated in the following circuit. If the output rms current i̟(rms)=130mA +%=20V VaEQı =VEBQ2 =0.7Vv R 1.0ka Vor=Voz=0.7V QI DI 2 D2 C3 Q2 -Vml R2 1.0kn in VE=-20V a) Calculate the total input average DC power and the output AC power b) Calculate the power-dissipation of two transistors Ql & Q2 c) Determine the Eficiency d) Calculate the maximum input DC power and the maximum output AC power e) Explain what is the cross-over distortion and how it could be eliminated
a=7
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