13.1 Refer to the two magnetically coupled coils of Fig. 13.69(a). The polarity of the mutual voltage is: (a) Positive (b) Negative (a) Figure 13.69 For Review Questions 13.1 and 13.2. 13.2 For the two magnetically coupled coils of Fig. 13.69(b), the polarity of the mutual voltage is: (a) Positive (b) Negative 13.3 The coefficient of coupling for two coils having L = 2 H, L2 = 8 H, M = 3 H is: (a) 0.1875 (b) 0.75 (c) 1.333 (d) 5.333
13.1 Refer to the two magnetically coupled coils of Fig. 13.69(a). The polarity of the mutual voltage is: (a) Positive (b) Negative (a) Figure 13.69 For Review Questions 13.1 and 13.2. 13.2 For the two magnetically coupled coils of Fig. 13.69(b), the polarity of the mutual voltage is: (a) Positive (b) Negative 13.3 The coefficient of coupling for two coils having L = 2 H, L2 = 8 H, M = 3 H is: (a) 0.1875 (b) 0.75 (c) 1.333 (d) 5.333
Introductory Circuit Analysis (13th Edition)
13th Edition
ISBN:9780133923605
Author:Robert L. Boylestad
Publisher:Robert L. Boylestad
Chapter1: Introduction
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Chapter 13 Magnetically Coupled Circuits
Review Questions
13.1 Refer to the two magnetically coupled coils of
Fig. 13.69(a). The polarity of the mutual voltage is:
13.6 For the ideal transformer in Fig. 13.70(b),
Na/N, = 10. The ratio I/1, is:
(a) Positive
(b) Negative
(a) 10 (b) 0.1 (c) -0.1 (d) – 10
13.7 A three-winding transformer is connected as
portrayed in Fig. 13.71(a). The value of the output
voltage V, is:
M
M
(a) 10 (b) 6
(c) -6
(d) - 10
(a)
(b)
Figure 13.69
For Review Questions 13.1 and 13.2.
E2 V
2V
50 V
50 V
8 V
E8 V
13.2 For the two magnetically coupled coils of
Fig. 13.69(b), the polarity of the mutual voltage is:
(a)
(b)
Figure 13.71
For Review Questions 13.7 and 13.8.
(a) Positive
(b) Negative
13.3 The coefficient of coupling for two coils having
L = 2 H, L2 = 8 H, M = 3 H is:
:
13.8 If the three-winding transformer is connected as in
Fig. 13.71(b), the value of the output voltage V, is:
(a) 0.1875
(b) 0.75
(c) 1.333
(d) 5.333
(a) 10 (b) 6
(c) -6
(d) - 10
13.4 A transformer is used in stepping down or stepping up:
13.9 In order to match a source with intermal impedance
of 500 N to a 15-N load, what is needed is:
(a) de voltages (b) ac voltages
(c) both de and ac voltages
(a) step-up linear transformer
(b) step-down linear transformer
(c) step-up ideal transformer
13.5 The ideal transformer in Fig. 13.70(a) has
N2/N = 10. The ratio V2/V, is:
(d) step-down ideal transformer
(e) autotransformer
(a) 10 (b) 0.1 (c) -0.1
(d) – 10
13.10 Which of these transformers can be used as an
N:N2
N:N
isolation device?
(a) linear transformer (b) ideal transformer
(c) autotransformer
(d) all of the above
(a)
(b)
Answers: 13.1b, 13.2a, 13.3b, 13.4b, 13.5d, 13.6b,
Figure 13.70
For Review Questions 13.5 and 13.6.
13.7c, 13.8a, 13.9d, 13,10b.
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