Electric Motor Control
Electric Motor Control
10th Edition
ISBN: 9781305177611
Author: Herman
Publisher: Cengage
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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. - 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
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