Electric Motor Control
10th Edition
ISBN: 9781305177611
Author: Herman
Publisher: Cengage
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Chapter 42, Problem 11SQ
To determine
Explain how DC is obtained from a brushless rotor.
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The joint probability density function of two discrete random variables X and
Y is given by p(x, y)=c(2x+y), where x and y can assume all integers such that 0≤
x≤2, 0≤ y ≤ 3, and p (x, y)= 0 otherwise. a) Find the value of the constant c. (c)
Find P(X≥1, Y≤2). (b) Find P(X=2, Y= 1).
A wattmeter is connected with the positive lead on phase "a" of a three-phase system. The negative lead
is connected to phase "b". A separate wattmeter has the positive lead connected to phase "c". The
negative lead of this wattmeter is connected also to phase "b". If the input voltage is 208 volts line-to-
line, the phase sequence is "abc" and the load is 1200 ohm resistors connected in "Y", what is the
expected reading of each of the wattmeters? (Hint: draw a phasor diagram)
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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