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Gibilisco: MCQ in Basic DC Circuits | ECE Board Exam

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

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.

Solution:

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

A. An engineerโs general circuit idea notebook.

D. A procedural flowchart.

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

Solution:

Topics Included in the Test from Chapter 1 to Chapter 8

Part 1: Direct Current
Chapter 6: MCQ in Resistors
Chapter 8: MCQ in Magnetism

Complete List of Multiple Choice Questions from this Book

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