1- A 1-phase transformer has 400 primary and 1000 secondary turns. The net cross-sectional area of the core is 60 cm². If the primary winding be connected to a 50 Hz supplyat 500V. calculate a/ the peak value of the flux density in the core, and by the voltageinduced in the secondary winding.[a/ 0.94 wb/m²; b/1250V]2- Determine the number of turns per-phase in each winding of a 3-phase transformerwith a ratio of 20000/2000v. to work on a 50Hz network. The high-voltage winding isdelta connected and the low-voltage is star-connected. Each core has a gross sectionalarea of 560 cm². Assume a flux density of about 1.2 wb/m².[1490/86]3- A 3-phas step-down transformer is connected to 6600V mains, and takes 10A. Calculatethe secondary line voltage, line current and the output for the following connections:a. Delta/delta b. star/star c. delta/star d. star/delta.The ratio of turns perphase is 12. Neglect losses.[(a) and (b) 550V, 120A; (c) 953 V, 69.4 A; (d) 318 V, 208A output 114.3 kVA]4-A 1-phase transformer has 180 and 90 turns respectively in its secondary and primarywindings. The respective resistances are 0.23302 and 0.067 2. Calculate the equivalentresistance of:a. The primary in terms of the secondary winding.b. The secondary in terms of the primary winding.c. The total resistance of the transformer in terms of the primary.[0.268 2; 0.058 2; 0.125 02]

Answered: Image /qna-images/answer/bb0bbaaf-50aa-4df3-b7cb-ccbc96391751.jpg

1- A 1-phase transformer has 400 primary and 1000 secondary turns. The net cross- sectional area of the core is 60 cm². If the primary winding be connected to a 50 Hz supply at 500V. calculate a/ the peak value of the flux density in the core, and b/ the voltage induced in the secondary winding. [a/ 0.94 wb/m²; b/ 1250V]

1- A 1-phase transformer has 400 primary and 1000 secondary turns. The net cross- sectional area of the core is 60 cm². If the primary winding be connected to a 50 Hz supply at 500V. calculate a/ the peak value of the flux density in the core, and b/ the voltage induced in the secondary winding. [a/ 0.94 wb/m²; b/ 1250V]

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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