This is the Multiple Choice Questions (MCQs) in Chapter 15: Impedance and Admittance from the book Teach Yourself Electricity and Electronics, 5th edition by Stan Gibilisco. If you are looking for a reviewer in Electronics Engineering this will definitely help you before taking the Board Exam.
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⇐ Gibilisco: MCQ in Capacitive Reactance | ECE Board Exam
Choose the letter of the best answer in each questions.
1. The square of an imaginary number:
A. Can never be negative.
B. Can never be positive.
C. Might be either positive or negative.
D. Is equal to j.
Answer: Option B
Solution:
2. A complex number:
A. Is the same thing as an imaginary number.
B. Has a real part and an imaginary part.
C. Is one-dimensional.
D. Is a concept reserved for elite imaginations.
Answer: Option B
Solution:
3. What is the sum of 3 + j7 and 3 – j7?
A. 0 + j0
B. 6 + j14.
C. -6 – j14.
D. 0 – j14.
Answer: Option A
Solution:
4. What is (-5 + j7) – (4 – j5)?
A. -1 + j2.
B. -9 – j2.
C. -1 – j2.
D. -9 + j12.
Answer: Option D
Solution:
5. What is the product (-4 – j7) (6 – j2)?
A. 24 – j14.
B. -38 – j34.
C. -24 – j14.
D. -24 + j14.
Answer: Option B
Solution:
6. What is the magnitude of the vector 18 – j24?
A. 42.
B. -42.
C. 30.
D. -30.
Answer: Option C
Solution:
7. The impedance vector 5 + j0 represents:
A. A pure resistance.
B. A pure inductance.
C. A pure capacitance.
D. An inductance combined with a capacitance.
Answer: Option A
Solution:
8. The impedance vector 0 – j22 represents:
A. A pure resistance.
B. A pure inductance.
C. A pure capacitance.
D. An inductance combined with a resistance.
Answer: Option C
Solution:
9. What is the absolute-value impedance of 3.0 – j6.0?
A. Z = 9.0 Ω.
B. Z = 3.0 Ω.
C. Z = 45 Ω.
D. Z = 6.7 Ω.
Answer: Option D
Solution:
10. What is the absolute-value impedance of 50 – j235?
A. Z = 240 Ω.
B. Z = 58,000 Ω.
C. Z = 285 Ω.
D. Z = 185 Ω.
Answer: Option A
Solution:
11. If the center conductor of a coaxial cable is made to have smaller diameter, all other things being equal, what will happen to the Zo of the transmission line?
A. It will increase.
B. It will decrease.
C. It will stay the same.
D. There is no way to know.
Answer: Option A
Solution:
12. If a device is said to have an impedance of Z = 100 Ω, this would most often mean that:
A. R + jX =100 + j0.
B. R + jX = 0 + j100.
C. R + jX = 0 – j100.
D. You need to know more specific information.
Answer: Option A
Solution:
13. A capacitor has a value of 0.050 μF at 665 kHz. What is the capacitive susceptance?
A. j4.79.
B. –j4.79.
C. j0. 209.
D. –j0. 209.
Answer: Option C
Solution:
14. An inductor has a value of 44 mH at 60 Hz. What is the inductive susceptance?
A. –j0.060.
B. j0.060.
C. –j17.
D. j17.
Answer: Option A
Solution:
15. Susceptance and conductance add to form:
A. Impedance.
B. Inductance.
C. Reactance.
D. Admittance.
Answer: Option D
Solution:
16. Absolute-value impedance is equal to the square root of:
A. G2 + B2
B. R2 + X2.
C. Zo.
D. Y.
Answer: Option B
Solution:
17. Inductive susceptance is measured in:
A. Ohms.
B. Henrys.
C. Farads.
D. Siemens.
Answer: Option D
Solution:
18. Capacitive susceptance is:
A. Positive and real valued.
B. Negative and real valued.
C. Positive and imaginary.
D. Negative and imaginary.
Answer: Option C
Solution:
19. Which of the following is false?
A. BC = 1/XC.
B. Complex impedance can be depicted as a vector.
C. Characteristic impedance is complex.
D. G = 1/R.
Answer: Option C
Solution:
20. In general, the greater the absolute value of the impedance in a circuit:
A. The greater the flow of alternating current.
B. The less the flow of alternating current.
C. The larger the reactance.
D. The larger the resistance.
Answer: Option B
Solution:
Topics Included in the Test from Chapter 9 to Chapter 18
Complete List of Multiple Choice Questions from this Book
Check your work.
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