QI: Fill in the blanks for the following: 1- The transformer called step-up transformer, when the number of greater than winding winding. 2- At no-load the power input to transformer equal to 3- The value of resistance between primary and secondary winding practically equal to 4- The developed in armature winding. power losses its difference between mechanical power and power 5- If the armature resistance Ra increases, the Emf will

QI: Fill in the blanks for the following: 1- The transformer called step-up transformer, when the number of greater than winding winding. 2- At no-load the power input to transformer equal to 3- The value of resistance between primary and secondary winding practically equal to 4- The developed in armature winding. power losses its difference between mechanical power and power 5- If the armature resistance Ra increases, the Emf will

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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Two transformers A and B have the following data Transformer A: 6600/440 V, (250 KVA ) requires ( 6%) of rated voltage to circulate (90%) of full load current at power factor (0.25) when the low voltage winding is short circuited and the no load loss is equal to (2500 W). Transformer B: 6600/420 V, (600 KVA) requires (9%) of rated voltage to circulate (80%) of full load current at power factor (0.16) when low voltage winding is short circuited and no load loss is equal to (4500 W). Calculate the followings: If both transformers are connected in parallel to supply a load (1.2 + j 2.3) ohm, find the output power of each transformer.
Q1: During the separation of transformer core losses experiment: 1. Why should always keep the ratio of V/F constant? 2. If the transformer is operated at rated frequency but at voltage lower than rated value, how do you expect the following quantities to change? And why? i. Hysteresis loss ii. Eddy current loss iii. No-load current rotod
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A transformer core is laminated in order to ....................................? (A) reduce hysteresis loss and eddy current loss (B) reduce only hysteresis loss (C) reduce copper loss (D) reduce all of the above losses (E) None of the above.
Find the elements of the equivalent circuit relative to the secondary of a single-phase transformer. The no- load voltages in the primary and secondary circuit are 200 and 400 volts, respectively, and at a frequency of 50 Hz. The primary no-load current at a voltage of 200 volts is 0.7 amps and the losses in the core are 70 watts. The resistance and reactance of the primary are 3.2 and 1.25 ohms, respectively. Secondary resistance and reactance 6. 0, 0.07 ohms, respectively. Draw the equivalent circle, showing the values of its elements.
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Find the elements of the equivalent circuit relative to the secondary of a single-phase transformer. The no-load voltages in the primary and secondary circuits are 200,400 volts, respectively, at a frequency of 50 Hz The primary no-load current at voltage 200 equals 0.7 amps and pulp losses equal to 70 watts Primary resistance and reactance 3.2 , 1.25 In order, the reactance of the resistance and the coil 0.6 , 0.7 Then draw the equivalent circle, explaining the values
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Core losses of a single phase 440/240 V, 24 kVA, 50 Hz transformer is 750 W. Maximum efficiency of the transformer is 90% at 15 kVA load and a certain power factor. Find the efficiency of the transformer at the same power factor and full load.
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Q5/A single phase, 50-Hz transformer has 80 turns on the primary winding and 400 turns on the secondary winding. The net cross-sectional area of the core is 200 cm2. If the primary winding is connected to 240-V, 50-Hz supply, determine (a) the emf induced in the secondary winding, and (b) the maximum flux density in the core. ()
Consider the following open circuit transformer as shown in figure below which operate at: the voltage sources at no load (Voc)=170 V no load current (Ioc) = 85 m A iron losses power (Poc) = 14 W power factor = cos∅= 0.968 Compute the No load transformer parameter magnetizing (Im) and copper losses current (Ic) , (R0) and (X0) ?