Electric Motor Control
10th Edition
ISBN: 9781305177611
Author: Herman
Publisher: Cengage
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Textbook Question
Chapter 48, Problem 6SQ
What is the purpose of the lockout relay or safety latch relay?
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Waveforms v1(t) and v2(t) are given by:v1(t) = −4 sin(6π ×10^4t +30◦) V,v2(t) = 2cos(6π ×10^4t −30◦) V.Does v2(t) lead or lag v1(t), and by what phase angle?
7.1 Express the current waveform
i(t) = -0.2 cos(6 × 10°1 +60°) mA
in standard cosine form and then determine the following:
(a) Its amplitude, frequency, and phase angle.
(b) i(t) at t=0.1 ns.
3. Consider the RC circuit with a constant voltage source shown in the diagram below. The
values of the resistor, capacitor, and input voltage are R = 50, C = 10 µF, and V = 6V,
respectively. Assume that there is initially no charge on the capacitor before the switch is
closed.
Vo
↑i(t)
R
w
C
When the switch closes at time t = 0, the current begins to flow as a function of time according
to the equation
i(t) = ioenc
Chapter 48 Solutions
Electric Motor Control
Ch. 48 - In Figure 482, what is the purpose of normally...Ch. 48 - Can a time-delay relay be used satisfactorily in a...Ch. 48 - Prob. 3SQCh. 48 - Prob. 4SQCh. 48 - Prob. 5SQCh. 48 - What is the purpose of the lockout relay or safety...Ch. 48 - What happens if the reverse push button is closed...Ch. 48 - Prob. 8SQCh. 48 - Prob. 9SQCh. 48 - In Figure 487, is it necessary to push the stop...
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