You have been hired as a consultation engineer for a manufacturing company to test anddiagnose a low voltage and overheating problem with a single phase transformer utilized tosupply their single phase loads.The company technicians informed you that the transfomer has a solid nickel core, insulatedahumimum windings and its nameplate ratings are 100 kVA, 6600/230 V, 60 Hz.(a) Given that the transformer is delivering 80% full load at 0.9 power factor lag, calculate:i) the output voltage assuming the input voltage is maintained at 6600Vii) the voltage regulation at this loadiii) the efficiency at this load

Given: Transformer ratings: 100 kVA, 6600/230 V, 50 Hz The transformer is delivering 80% of full…

You have been hired as a consultation engineer for a manufacturing company to test and diagnose a low voltage and overheating problem with a single phase transformer utilized to supply their single phase loads. The company technicians informed you that the transformer has a solid nickel core, insulated aluminum windings and its nameplate ratings are 100 kVA, 6600/230 V, 60 Hz (a) Given that the transformer is delivering 80% full load at 0.9 power factor lag calculate: 1) the output voltage assuming the input voltage is maintained at 6600V n the voltage regulation at this load iIm) the efficiency at this load

You have been hired as a consultation engineer for a manufacturing company to test and diagnose a low voltage and overheating problem with a single phase transformer utilized to supply their single phase loads. The company technicians informed you that the transformer has a solid nickel core, insulated aluminum windings and its nameplate ratings are 100 kVA, 6600/230 V, 60 Hz (a) Given that the transformer is delivering 80% full load at 0.9 power factor lag calculate: 1) the output voltage assuming the input voltage is maintained at 6600V n the voltage regulation at this load iIm) the efficiency at this load

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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The efficiency of a transformer will be maximum when ........................? (A) copper losses = hysteresis losses (B) hysteresis losses = eddy current losses (C) eddy current losses = copper losses (D) copper losses = hysteresis losses plus eddy current losses (E) None of the above.
A single phase 220/6 Volt, 50 Hz transformer has a rated primary current = 0.5 A. its maximum efficiency is at load current = 15 A and equal to 94% at unity p.f. Its efficiency at rated load, 0.65 p.f. lagging is: 087.8%. 092.3%. 090.9%. O None.
C2 (i). Draw the Schematic diagram and explain the working of LVDT and write any two applications of it. (ii) A 12 kVA, 56HZ, single-phase transformer has a turns ratio of 18 : 2 and is supplied from a 2.5 kV supply. Neglecting losses, determine (a) the secondary voltage, (b) the full load primary current, (c) the maximum flux and (d) the minimum value of load resistance which can be connected across the secondary winding without the kVA rating being exceeded secondary voltage primary current maximum flux secondary resistance
B/ Fill in the blanks: 1. The purpose of providing the iron core in the transformer is to 2. A transformer transforms... 3. Power transformers are designed to have maximum efficiency at 4. The transformer ratings are usually expressed in terms of menm
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Q5:Choose the correct answer from the given alternatives (answer five only) 1.In an ideal transformer, (a) windings have no resistance (b) core has infinite permeability (d) all of the above. (c) core has no losses 2. The primary and secondary induced e.m.fs. El and E2 in a two-winding transformer are always: (a) equal in magnitude (b) in-phase with each other (c) antiphase with each other (d) determined by load on transformer secondary. 3. In relation to a transformer, the ratio 20 : 1 indicates that (a) there are 20 turns on primary one turn on secondary (b) secondary voltage is 1/20th of primary voltage (c) primary current is 20 times greater than the secondary current. (d) for every 20 turns on primary, there is one turn on secondary. 4. A transformer has negative voltage regulation when its load power factor is: (a) zero (b) lagging. (d) unity (c) leading
4. Why the efficiency of the transformer is high at half load compared to full load?
Choose the correct answer from the given alternative: 1. In an ideal transformer, (a) windings have no resistance (c) core has no losses (b) core has infinite permeability (d) all of the above. 2. The primary and secondary induced e.m.fs. El and E2 in a two-winding transformer are always: (a) equal in magnitude (b) in-phase with each other (c) antiphase with each other (d) determined by load on transformer secondary. 3. In relation to a transformer, the ratio 20: 1 indicates that (a) there are 20 turns on primary one turn on secondary (b) secondary voltage is 1/20th of primary voltage (c) primary current is 20 times greater than the secondary current. (d) for every 20 turns on primary, there is one turn on secondary. 4. A transformer has negative voltage regulation when its load power factor is: (a) zero (b) lagging. (d) unity (c) leading 5. During short-circuit test, the iron loss of a transformer is negligible because: (a) the entire input is just sufficient to meet Cu losses only…
2- Proved that a resistance of (R¡ )in primary is equivalent to (R1 K’ )in secondary.? 3- A 40-kVA, 3,300/240-V, 50 Hz, 1-phase transformer has 660 turns on the primary. Determine (a) the number of turns on the secondary (b) the maximum value of flux in the core (c) the approximate value of primary and secondary full-load currents. Internal drops in the windings are to be ignored.