Delmar's Standard Textbook of Electricity (MindTap Course List)
6th Edition
ISBN: 9781285852706
Author: Stephen L. Herman
Publisher: Cengage Learning
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Chapter 28, Problem 5RQ
What is an autotransformer?
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Q1. In a Boost converter, L = 25 μH, Vin = 12 V, D = 0.4, P = 25 W, and fs
(i) if the output load is changing. Calculate the critical value of the output load P,below which
the converter will enter the discontinuous conduction mode of operation. Assume the total
turn-on loss is equal to 2 W.
(ii) Assuming the input voltage fluctuates from 10 V to 14 V and the output voltage is regulated
to 20 V. Calculate the critical value of the inductance L below which this Boost converter will
enter the discontinuous conduction mode of operation at P = 5 W.
(iii) Draw the waveforms for inductor voltage, inductor current, and the capacitor current for
this Boost converter at the output load that causes it to operate at the border of continuous and
discontinuous modes.
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Answer the following questions:
1- Write radiation resistance (R.) equation for infinitesimal dipole antenna.
2- Write the angle expression form of first null beam width (FNBW) for 2/2 dipole.
3- Define the Directivity of antenna.
4- Write radar cross section equation.
5- Write the input impedance (Z) expression of lossless transmission line.
Chapter 28 Solutions
Delmar's Standard Textbook of Electricity (MindTap Course List)
Ch. 28 - What is a transformer?Ch. 28 - What are common efficiencies for transformers?Ch. 28 - What is an isolation transformer?Ch. 28 - All values of a transformer are proportional to...Ch. 28 - What is an autotransformer?Ch. 28 - What is a disadvantage of an autotransformer?Ch. 28 - Explain the difference between a step-up and a...Ch. 28 - A transformer has a primary voltage of 240 V and a...Ch. 28 - A transformer has an output of 750 VA. The primary...Ch. 28 - A transformer has a turns ratio of 1:6. The...
Ch. 28 - What do the dots shown beside the terminal leads...Ch. 28 - A transformer has a primary voltage rating of 240...Ch. 28 - If the windings of the transformer in Question 12...Ch. 28 - The primary leads of a transformer are labeled 1...Ch. 28 - You are working in an industrial plant. You must...Ch. 28 - EP120VIPNP300TurnsRatioEs24IsNsZ=3Ch. 28 - EP240VIPNPRatioEs320VIsNs280Z=500Ch. 28 - EPIPNPRatio1:2.5Es160VIsNs80TurnsZ=12Ch. 28 - Prob. 4PPCh. 28 - Prob. 5PPCh. 28 - ES480VIPNS275turnsRatioESISNS525turnsZ=1.2kCh. 28 - ...Ch. 28 - ...
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