Electric Motor Control
10th Edition
ISBN: 9781305177611
Author: Herman
Publisher: Cengage
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Chapter 43, Problem 5SQ
To determine
Explain the reasons for connecting the power to the shunt field even when the motor is not operating.
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1. Is1 = 2ls2 = 4 × 10-16 A, B₁ = ẞ2 = 100, and R₁ = 5 kQ. Find the VB such that lx = 1 mA.
(30 points)
R1
ww
Q2
+
VB
Figure 1
2-2) Lathi & Ding prob. 2.6-1
2.6-1 Find the correlation coefficient p between of signal x(t) and each of the four pulses g1(1), 82(1),
83(1), and g4(f) shown in Fig. P2.6-1. To provide maximum margin against the noise along the
transmission path, which pair of pulses would you select for a binary communication?
Figure P.2.6-1
x(f)
(a)
8(1)
(b)
82(1)
(c)
1
1
sin 2πt
sin 4πt
-sin 2
0
0.707
83(1)
0
1
(d)
0
M
P
0.707
84(1)
(e)
0
0.5
-0.707
2. Determine the operation point and the small-signal model of Q₁ for each of the circuits
shown in Fig. 2. Assume Is = 8 × 10-16 A, B = 100 and VA = ∞.
a) 20 points
b) 20 points
0.8 V
RC
50 Ω
+
Vcc = 2.5 V
4A"
Figure 2-a
Rc1kQ
+
Vcc = 2.5 V
Figure 2-b
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