Q5) Choose the correct answer:1. Three phase, Y-connected transformer is normally supplied form.a. AC input voltage.b. DC input voltage.c. Both of Them.2. Short circuit test of transformer is handle on:a. Low voltage side.b. High voltage side.3. Ideal transformer means.a. Input power equal to outputb. Efficiency is 100%c. Loss equal zerod. All of above4. The magnetizing branch parameters of 1-phase transformers are calculated using.a. Open circuit testb. Short circuit testc. DC test5. The efficiency of V-V connection transformer is:a. 100 %b. 57%с. 66%6. Three winding transformer is consisting of.a. Two primary and one secondary windingsb. Two primary windings and autotransformerc. One primary and two secondary7. The speed of magnetic flux of the stator winding in 3-phase induction motor is.a. Ns=120f/sb. Ns=120f/pc. Ns=2w/s8. Speed control by change the number of stator polis is used with.a. Cage rotor induction motorb. Slip ring induction motorc. None of them.

As per the guidelines of Bartleby we supposed to answer 1st three sub part of the question . for…

Q5) Choose the correct answer: 1. Three phase, Y-connected transformer is normally supplied form. a. AC input voltage. b. DC input voltage. c. Both of Them. 2. Short circuit test of transformer is handle on: a. Low voltage side. b. High voltage side. 3. Ideal transformer means. a. Input power equal to output b. Efficiency is 100% c. Loss equal zero d. All of above

Q5) Choose the correct answer: 1. Three phase, Y-connected transformer is normally supplied form. a. AC input voltage. b. DC input voltage. c. Both of Them. 2. Short circuit test of transformer is handle on: a. Low voltage side. b. High voltage side. 3. Ideal transformer means. a. Input power equal to output b. Efficiency is 100% c. Loss equal zero d. All of above

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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Complete the blank An isolating transformer is a (..........................)ratio transformer with several important applications.
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1. How is the performance of a transformer measured? Why low voltage regulation and high efficiency is better? What is the meaning of positive and negative voltage regulations?
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A one-phase transformer has 400 and 1000 turns in primary and secondary, respectively. The cross-sectional area of the core is 60 cm?. The primary of the transformer is connected to a supply of one-phase, 50 Hz, 500 V. Determine the secondary voltage of the transformer.
The label values of the single-phase transformer whose electrical equivalent circuit is given below are 20 kVA, 15400V / 240V, 50 Hz. This transformer Calculate what is required below. a. What is the value of the active power measured in the short circuit test? b. What is the value of the active power measured in the idle test? c. Voltage regulation was found to be 0.1% at 0.8 back power factor. Accordingly, using any method you want Find out how many kVA the transformer draws from the network (primary apparent power).
Describe the difference of output for a power supply versus control power transformer.
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…
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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
5. Write down the equations of a single phase transformer at no-load mode. Give the names of the resistances, reactance, e.m.f.'s, currents and voltages.