Problem 4: A. The signal-flow graph of a system is shown in Figure 1.4-A. Use Mason's gain formula to determine the system's closed-loop transfer function, T(s) = Y(s) %3D R(s) Y(s) R(s) Figure 1.4-A Solution

Problem 4: A. The signal-flow graph of a system is shown in Figure 1.4-A. Use Mason's gain formula to determine the system's closed-loop transfer function, T(s) = Y(s) %3D R(s) Y(s) R(s) Figure 1.4-A Solution

Delmar's Standard Textbook Of Electricity

7th Edition

ISBN:9781337900348

Author:Stephen L. Herman

Publisher:Stephen L. Herman

Chapter15: Alternating Current

Section: Chapter Questions

Problem 4RQ: 4. What is frequency?

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Concept explainers

Types of Thyristors

With four layers of alternating P- and N- materials, a thyristor is a solid-state semiconductor device. It acts as a type of bi-stable switch and it conducts when the gate receives a current trigger and continues to conduct until the voltage is reverse biased across the device or by some means until the voltage is removed. The silicon-controlled rectifier is considered synonymous with thyristors by some sources. Thyristors are defined as more complex by other sources as it contains at least four-layer of alternating N-type and P-type substrate. They find large applications in the control of electrical power supplies, electric motor speed control, and ranging of light dimmers because thyristors can control large amounts of power supplies and voltage with a small device. The circuit symbol of the thyristor is given below.

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Problem 4:
A. The signal-flow graph of a system is shown in Figure 1.4-A. Use Mason's gain formula
to determine the system's closed-loop transfer function, T(s):
Y(s)
%3D
R(s)
Y(s)
R(s)
Figure 1.4-A
Solution

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