This is the Multiple Choice Questions (MCQs) in Chapter 4: Basic DC Circuits 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**

โ Gibilisco: MCQ in Measuring Devices | ECE Board Exam

**Choose the letter of the best answer in each questions.**

1. Suppose you double the voltage in a simple dc circuit, and cut the resistance in half. The current will become:

A. Four times as great.

B. Twice as great.

C. The same as it was before.

D. Half as great.

Answer: **Option A**

Solution:

2. A wiring diagram would most likely be found in:

A. An engineerโs general circuit idea notebook.

B. An advertisement for an electrical device.

C. The service/repair manual for a radio receiver.

D. A procedural flowchart.

Answer: **Option C**

Solution:

**NOTE: For questions 3 through 11, see Fig. 4-7.**

3. Given a dc voltage source delivering 24 V and a circuit resistance of 3.3 Kฮฉ, what is the current?

A. 0.73 A.

B. 138 A.

C. 138 mA.

D. 7.3 mA.

Answer: **Option D**

Solution:

4. Suppose that a circuit has 472 ฮฉ of resistance and the current is 875 mA. Then the source voltage is:

A. 413 V.

B. 0.539 V.

C. 1.85 V.

D. None of the above.

Answer: **Option A**

Solution:

5. The dc voltage in a circuit is 550 mV and the current is 7.2 mA. Then the resistance is:

A. 0.76 ฮฉ.

B. 76 ฮฉ.

C. 0.0040 ฮฉ.

D. None of the above.

Answer: **Option B**

Solution:

6. Given a dc voltage source of 3.5 kV and a circuit resistance of 220 ฮฉ, what is the current?

A. 16 mA.

B. 6.3 mA.

C. 6.3 A.

D. None of the above.

Answer: **Option D**

Solution:

7. A circuit has a total resistance of 473,332 ฮฉ and draws 4.4 mA. The best expression for the voltage of the source is:

A. 2082 V.

B. 110 kV.

C. 2.1 kV.

D. 2.08266 kV.

Answer: **Option C**

Solution:

8. A source delivers 12 V and the current is 777 mA. Then the best expression for the resistance is:

A. 15 ฮฉ.

B. 15.4 ฮฉ.

C. 9.3 ฮฉ.

D. 9.32 ฮฉ.

Answer: **Option A**

Solution:

9. The voltage is 250 V and the current is 8.0 mA. The power dissipated by the potentiometer is:

A. 31 mW.

B. 31 W.

C. 2.0 W.

D. 2.0 mW.

Answer: **Option C**

Solution:

10. The voltage from the source is 12 V and the potentiometer is set for 470 ฮฉ. The power is about:

A. 310 mW.

B. 25.5 mW.

C. 39.2 W.

D. 3.26 W.

Answer: **Option A**

Solution:

11. The current through the potentiometer is 17 mA and its value is 1.22Kฮฉ. The power is:

A. 0.24 ฮผW.

B. 20.7 W.

C. 20.7 mW.

D. 350 mW.

Answer: **Option D**

Solution:

12. Suppose six resistors are hooked up in series, and each of them has a value of 540 ฮฉ. Then the total resistance is:

A. 90 ฮฉ.

B. 3.24 Kฮฉ.

C. 540 ฮฉ.

D. None of the above.

Answer: **Option B**

Solution:

13. Four resistors are connected in series, each with a value of 4.0 Kฮฉ. The total resistance is:

A. 1 Kฮฉ.

B. 4 Kฮฉ.

C. 8 Kฮฉ.

D. 16 Kฮฉ.

Answer: **Option D**

Solution:

14. Suppose you have three resistors in parallel, each with a value of 68,000 ฮฉ. Then the total resistance is:

A. 23 ฮฉ.

B. 23 Kฮฉ.

C. 204 ฮฉ.

D. 0.2 Mฮฉ.

Answer: **Option B**

Solution:

15. There are three resistors in parallel, with values of 22 ฮฉ, 27ฮฉ, and 33 ฮฉ. A 12-V battery is connected across this combination, as shown in Fig. 4-11. What is the current drawn from the battery by this resistance combination?

A. 1.3 A.

B. 15 mA.

C. 150 mA.

D. 1.5 A.

Answer: **Option A**

Solution:

16. Three resistors, with values of 47 ฮฉ, 68 ฮฉ, and 82 ฮฉ, are connected in series with a 50-V dc generator, as shown in Fig. 4-12. The total power consumed by this network of resistors is:

A. 250 mW.

B. 13 mW.

C. 13 W.

D. Not determinable from the data given.

Answer: **Option B**

Solution:

17. You have an unlimited supply of 1-W, 100-ฮฉ resistors. You need to get a 100- ฮฉ, 10-W resistor. This can be done most cheaply by means of a series-parallel matrix of

A. 3 X 3 resistors.

B. 4 X 3 resistors.

C. 4 X 4 resistors.

D. 2 X 5 resistors.

Answer: **Option C**

Solution:

18. You have an unlimited supply of 1-W, 1000-ฮฉ resistors, and you need a 500-ฮฉ resistance rated at 7 W or more. This can be done by assembling:

A. Four sets of two 1000-ฮฉ resistors in series, and connecting these four sets in parallel.

B. Four sets of two 1000-ฮฉ resistors in parallel, and connecting these four sets in series.

C. A 3 X 3 series-parallel matrix of 1000-ฮฉ resistors.

D. Something other than any of the above.

Answer: **Option A**

Solution:

19. You have an unlimited supply of 1-W, 1000-ฮฉ resistors, and you need to get a 3000-ฮฉ, 5-W resistance. The best way is to:

A. Make a 2 X 2 series-parallel matrix.

B. Connect three of the resistors in parallel.

C. Make a 3 X 3 series-parallel matrix.

D. Do something other than any of the above.

Answer: **Option D**

Solution:

20. Good engineering practice usually requires that a series-parallel resistive network be made:

A. From resistors that are all very rugged.

B. From resistors that are all the same.

C. From a series combination of resistors in parallel.

D. From a parallel combination of resistors in series.

Answer: **Option B**

Solution:

### Topics Included in the Test from Chapter 1 to Chapter 8

**Part 1: Direct Current**

**MCQ in Basic Physical Concepts**

**MCQ in Electrical Units**

**MCQ in Measuring Devices**

**MCQ in Direct-Current Circuit Basics**

**MCQ in Direct-Current Circuit Analysis**

**MCQ in Resistors**

**MCQ in Cells and Batteries****MCQ in Magnetism**

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

### Check your work.

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