EBK DELMAR'S STANDARD TEXTBOOK OF ELECT
6th Edition
ISBN: 9781305537125
Author: Herman
Publisher: YUZU
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Chapter 28, Problem 6RQ
What is a disadvantage of an autotransformer?
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5. In relation to a compound d.c machine, choose the right statement from the following. (A) The resistance of the shunt field coil will be many times higher than the series field coil. (B) The resistance of the shunt field coil and the series field coil are of the same order. (C) The resistance of the series field coil will be many times higher than the shunt field coil. (D) Either of (A), (B) and (C) is true statement.
A de machine is controlled by the step-down de-de converter shown below.
The armature inductance La =0.2 mH and the armature resistance can be
neglected. The armature current is 5A. The Buck converter is operating at the
switching frequency is 30 kHz and the duty ratio is 0.8.
L₁
+
Answer the following questions:
1) Calculate the input voltage (Va) if the output voltage (ea = 200 V).
2) Find the ripple in the armature current (a).
3) Calculate the maximum and minimum values of the armature current (la).
4) Sketch the armature current (ia (t)) and the supply current (id (t)).
. Draw the circuit diagram for the four machine types that can be obtained
from the DC shunt wound machine. Name each type.
1987
1408
Chapter 28 Solutions
EBK DELMAR'S STANDARD TEXTBOOK OF ELECT
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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