Electric Motor Control
10th Edition
ISBN: 9781305177611
Author: Herman
Publisher: Cengage
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Textbook Question
Chapter 42, Problem 6SQ
What influence do both of the polarized field frequency relay (PFR) coils exert on the normally closed contact?
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7.29 The current source in the circuit of Fig. P7.29 is given by
is(t) = 12 cos(2л × 10¹t — 60°) mA.
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Apply the phasor-domain analysis technique to determine ic(t),
given that R= 20 2 and C = 1 μF.
PROBLEMS
7.33 Find ia(t) in the circuit of Fig. P7.33, given that
Us(t) = 40 sin(200t -20°) V.
7.25 Determine the impedances of the following elements:
(a) R 1 k at 1 MHz
=
(b) L= 30 μH at 1 MHz
*(c) C = 50 μF at 1 kHz
Chapter 42 Solutions
Electric Motor Control
Ch. 42 - What are the two basic methods of automatically...Ch. 42 - What is an out-of-step relay?Ch. 42 - Why is an out-of-step relay used on automatic...Ch. 42 - Under what conditions will the out-of-step relay...Ch. 42 - What is the last control contact that closes on a...Ch. 42 - What influence do both of the polarized field...Ch. 42 - Prob. 7SQCh. 42 - Approximately how much time (in terms of...Ch. 42 - How does the AC coil of the PFR receive the...Ch. 42 - Why is a control relay (CR1) used in Figure 426?...
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