This is the Multiple Choice Questions (MCQs) in Chapter 5: Direct Current Circuit Analysis 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

1. In a series-connected string of holiday ornament bulbs, if one bulb gets shorted out, which of these is most likely?

- A. All the other bulbs will go out.
- B. The current in the string will go up.
- C. The current in the string will go down.
- D. The current in the string will stay the same.

**NOTE: For questions 2, 3, 8, 9, see Fig. 5-9.**

2. Four resistors are connected in series across a 6.0-V battery. The values are *R*1 = 10 Ω, *R*2 = 20 Ω, *R*3 = 50 Ω, and *R*4 = 100 Ω as shown in Fig. 5-9. The voltage across R2 is:

- A. 0.18 V.
- B. 33 mV.
- C. 5.6 mV.
- D. 670 mV.

3. In question 2 (Fig. 5-9), the voltage across the combination of *R*3 and *R*4 is:

- A. 0.22 V.
- B. 0.22 mV.
- C. 5.0 V.
- D. 3.3 V.

**NOTE: For questions 4, 5, 6, 7, 10 and 11 see Fig. 5-10.**

4. Three resistors are connected in parallel across a battery that delivers 15 V. The values are *R*1 = 470 Ω, *R*2 = 2.2 KΩ, *R*3 = 3.3 KΩ(Fig. 5-10). The voltage across *R*2 is:

- A. 4.4 V.
- B 5.0 V.
- C. 15 V.
- D. Not determinable from the data given.

5. In the example of question 4 (Fig. 5-10), what is the current through *R*2?

- A. 6.8 mA.
- B. 43 mA.
- C. 150 mA.
- D. 6.8 A.

6. In the example of question 4 (Fig. 5-10), what is the total current drawn from the source?

- A. 6.8 mA.
- B. 43 mA.
- C. 150 mA.
- D. 6.8 A.

7. In the example of question 4 (Fig. 5-10), suppose that resistor R2 opens up. The current through the other two resistors will:

- A. Increase.
- B. Decrease.
- C. Drop to zero.
- D. No change.

8. Four resistors are connected in series with a 6.0-V supply, with values shown in Fig. 5-9 (the same as question 2). What is the power dissipated by the whole combination?

- A. 200 mW.
- B. 6.5 mW.
- C. 200 W.
- D. 6.5 W.

9. In Fig. 5-9, what is the power dissipated by *R*4?

- A. 11 mW.
- B. 0.11 W.
- C. 0.2 W.
- D. 6.5 mW.

10. Three resistors are in parallel in the same configuration and with the same values as in problem 4 (Fig. 5-10). What is the power dissipated by the whole set?

- A. 5.4 W.
- B. 5.4 uW.
- C. 650 W.
- D. 650 mW.

11. In Fig. 5-10, the power dissipated by *R*1 is:

- A. 32 mW.
- B. 480 mW.
- C. 2.1 W.
- D. 31 W.

12. Fill in the blank in the following sentence. In either series or a parallel circuit, the sum of the s in each component is equal to the total provided by the supply.

- A. Current.
- B. Voltage.
- C. Wattage.
- D. Resistance.

**NOTE: For questions 13 and 14 see Fig. 5-5.**

13. Refer to Fig. 5-5A. Suppose the resistors each have values of 33 Ω. The battery provides 24 V. The current I1 is:

- A. 1.1 A.
- B. 730 mA.
- C. 360 mA.
- D. Not determinable from the information given.

14. Refer to Fig. 5-5B. Let each resistor have a value of 820 Ω. Suppose the top three resistors all lead to light bulbs of the exact same wattage. If I1 = 50 mA and I2 = 70 mA, what is the power dissipated in the resistor carrying current I4?

- A. 33 W.
- B. 40 mW.
- C. 1.3 W.
- D. It can’t be found using the information given.

**NOTE: For questions 15 and 16 see Fig. 5-6.**

15. Refer to Fig. 5-6. Suppose the resistances *R*1, *R*2, *R*3, and *R*4 are in the ratio 1:2:4:8 from left to right, and the battery supplies 30 V. Then the voltage*E*2 is:

- A. 4 V.
- B. 8 V.
- C. 16 V.
- D. Not determinable from the data given.

16. Refer to Fig. 5-6. Let the resistances each be 3.3 KΩand the battery 12 V. If the plus terminal of a dc voltmeter is placed between *R*1 and *R*2 (with voltages *E1* and *E*2), and the minus terminal of the voltmeter is placed between *R*3 and *R*4 (with voltages *E*3 and *E*4*), *what will the meter register?

- A. 0 V.
- B. 3 V.
- C. 6 V.
- D. 12 V.

17. In a voltage divider network, the total resistance:

- A. Should be large to minimize current drain.
- B. Should be as small as the power supply will allow.
- C. Is not important.
- D. Should be such that the current is kept to 100 mA.

18. The maximum voltage output from a voltage divider:

- A. Is a fraction of the power supply voltage.
- B. Depends on the total resistance.
- C. Is equal to the supply voltage.
- D. Depends on the ratio of resistances.

**NOTE: For questions 19 and 20 see Fig. 5-7.**

19. Refer to Fig. 5-7. The battery *E *is 18.0 V. Suppose there are four resistors in the network: *R*1 = 100 Ω, *R*2 = 22.0 Ω, *R*3 = 33.0 Ω, *R*4 = 47.0 Ω. The voltage E3 at P3 is:

- A. 4.19 V.
- B. 13.8 V.
- C. 1.61 V.
- D. 2.94 V.

20. Refer to Fig. 5-7. The battery is 12 V; you want intermediate voltages of 3.0, 6.0 and 9.0 V. Suppose that a maximum of 200 mA is allowed through the network. What values should the resistors, *R*1, *R*2, *R*3, and *R*4 have, respectively?

- A. 15 Ω, 30 Ω, 45 Ω, 60 Ω.
- B. 60 Ω, 45 Ω, 30 Ω, 15 Ω.
- C. 15 Ω, 15 Ω, 15 Ω, 15 Ω.
- D. There isn’t enough information to design the circuit.