10. The phase current produced by a certain 240V, Y-connected generator is 12A. The corresponding line current is 11. A certain Y-connected generator produces phase voltages of 30V. The magnitude of the line voltages are 12. When the turns ratio of a transformer is 30 and the primary ac voltage is 6V, the secondary voltage is 13. If 10W of power are applied to the primary of an ideal transformer with a turns ratio of 7, the power delivered to the secondary load is 14. The turns required to match a 500 source to a 2000 load is

10. The phase current produced by a certain 240V, Y-connected generator is 12A. The corresponding line current is 11. A certain Y-connected generator produces phase voltages of 30V. The magnitude of the line voltages are 12. When the turns ratio of a transformer is 30 and the primary ac voltage is 6V, the secondary voltage is 13. If 10W of power are applied to the primary of an ideal transformer with a turns ratio of 7, the power delivered to the secondary load is 14. The turns required to match a 500 source to a 2000 load is

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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Q2/A/ What are the conditions for satisfying parallel operation of single phase transformer? Deduce an expression for the load shared by the two transformers in parallel when the transformers have equal voltage ratio? Prove your answer. B/ A 50 KVA, 2300/230 V, 60 11z transformer has a high voltage winding resistance of 0.650 and a low-voltage winding resistance of 0.0065 2. Laboratory tests showed the following results: Open circuit test: V = = 230 V, I =5.7A, P = 190 W Short circuit test: V-41.5 V, I-21.7 A, P-No wattmeter was used. 18 (2) Compute the value of primary voltage needed to give rated secondary voltage when the transformer is connected as a step-up one and is delivering 50 KVA at a power factor of 0.8 lagging. (b) Compute the efficiency under conditions of part (a).
Question 2. Consider a 10 KVA, 200/400 V, 50 Hz single-phase transformer has the following test results: O.C. test: 200 V, 0.6 A, 63 W (L.V. side) S.C. test : 20 V, 25 A, 85 W (H.V. side) Determine : i) The efficiency at 75 % of full-load at 0.9 leading power factor. ii) The secondary terminal voltage on fiull-load at unity power factor.
3. A 4-KVA single-phase transformer with impedance of 5% and a power factor of a load is 80%. The primary voltage is 200-V while the copper loss is 60-W. Find the p.u. voltage regulation. Answer: VR = 4.1%
The primary of a certain transformer takes 0.7 A at a power factor of 0.5 when it isconnected across 200 V, 50 Hz supply and the secondary is on open circuit. The number ofturns on the primary is twice that on the secondary. A load taking 10 A at a lagging powerfactor of 0.8 is now connected across the secondary. Calculate the primary current andpower factor. Draw the phasor diagram.
what is the turns ratio or voltage ratio of the two transformers?
Draw phasor daigram
Following are the results of a test carried out on a 230/600 V single phase, 7.5 kVA transformer. O.C. Test : 230 V, 1.2 A, 280 W, on L.V side S.C. Test : LV winding is shorted. 26 V, 11A, 155 W, H.V. Both the full load efficiency and full load regulation of the transformer on the side are 0.8 lagging p.f Search on.
P:11) Solve all parts.
9. Electrical transformer is shown on the figure bellow. Secondary winding Ng turns Primary winding N, tums Magnetic Flux. Primary Secondary current current Primary votage Secondary valtage Transformer Core The ratio between the voltages at the secondary U, and the primary Up windings is equal to: U. b) U, N U а) U, N. U, , c) = 1 N, N U, P