EBK ELECTRIC MOTOR CONTROL
10th Edition
ISBN: 9780100784598
Author: Herman
Publisher: YUZU
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Chapter 57, Problem 8SQ
(a)
To determine
Explain whether the resistance of the rheostat is to be increased or decreased to increase the generator voltage.
(b)
To determine
Explain the condition of current change in the generator’s shunt field winding to increase the generator voltage.
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Show that the input impedance of a lossy transmission line of length L connected to a load
impedance of Z is given by
Z₁Cosh(yL) + ZoSinh(yL)
Zin = Zo ZoCosh(YL) + Z₁Sihh(YL)
ex
Where Cosh(x) =
and Sinh(x) =
are the hyperbolic cosine and sine, respectively.
2
2
A sinusoidal source of V = 10 and Z = 50 - j40 is connected to a 60 lossless
transmission line of length 100 m with ẞ = 0.25. What is the Thevenin's equivalent of this
system seen looking into the load end of the transmission line?
2. On a distortionless transmission line, the voltage wave is given by
v(L,t) = 110e0.005L Cos(10³t + 2L) +55e-0.005L Cos(108t-2L)
where L is the length of the transmission line as measured from the load. If Z = 30002, find
a,ẞ, vp, and Zo.
Chapter 57 Solutions
EBK ELECTRIC MOTOR CONTROL
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