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.

**Start Practice Exam Test Questions**

⇐ 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 + *j*7 and 3 – *j*7?

A. 0 + *j*0

B. 6 + *j*14.

C. -6 – *j*14.

D. 0 – *j*14.

Answer: **Option A**

Solution:

4. What is (-5 + *j*7) – (4 – *j*5)?

A. -1 + *j*2.

B. -9 – *j*2.

C. -1 – *j*2.

D. -9 + *j*12.

Answer: **Option D**

Solution:

5. What is the product (-4 – *j*7) (6 – *j*2)?

A. 24 – *j*14.

B. -38 – *j*34.

C. -24 – *j*14.

D. -24 + *j*14.

Answer: **Option B**

Solution:

6. What is the magnitude of the vector 18 – *j*24?

A. 42.

B. -42.

C. 30.

D. -30.

Answer: **Option C**

Solution:

7. The impedance vector 5 + *j*0 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 – *j*22 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 – *j*6.0?

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 – *j*235?

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 *Z*o 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 *+ *j*X =100 + *j*0.

B. *R *+ *j*X = 0 + *j*100.

C. *R *+ *j*X = 0 – *j*100.

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. *j*4.79.

B. –*j*4.79.

C. *j*0. 209.

D. –*j*0. 209.

Answer: **Option C**

Solution:

14. An inductor has a value of 44 mH at 60 Hz. What is the inductive susceptance?

A. –*j*0.060.

B. *j*0*.*060.

C. –*j*17.

D. *j*17.

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. *G*2 + *B*2

B. *R*2 + *X*2.

C. *Z*o.

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

**Part 2: Alternating Current**

**MCQ in Alternating-Current Basics**

**MCQ in Inductance****MCQ in Capacitance**

**MCQ in Phase**

**MCQ in Inductive Reactance**

**MCQ in Capacitive Reactance**

**MCQ in Impedance and Admittance****MCQ in RLC and GLC Circuit Analysis**

**MCQ in Transformers and Impedance Matching**

### Complete List of Multiple Choice Questions from this Book

### Check your work.

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