20 multiple choice electronics semiconductors and transistors

Student ID: 22006482

Exam: 002904RR - Practical Exercise 4

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Questions 1 to 20: Select the best answer to each question. Note that a question and its answers may be split across a page break, so be sure that you have seen the entire question and all the answers before choosing an answer.

Use this illustration to answer the question.

1. Look at the circuit diagram shown in the figure. What would be the total measured capacitance across terminals 1 and 2? A. 0.15 μF B. 0.4 μF C. 0.33 μF D. 0.6 μF

Use this illustration to answer Questions 1 and 2.

2. Look at the two metal bars that are illustrated in the figure above. The magnetized condition of the bars is unknown to you. When you experiment with the bars, you find that one end of bar A attracts either end of bar B. Which of the following statements correctly describes the condition of the bars? A. Both bars are magnetized.

B. Only bar A is magnetized.

C. Only bar B is magnetized.

D. Either bar A or bar B is magnetized.

Use this illustration to answer the question.

3. Look at the characteristic curve that's shown in the figure. A diode that's biased at point A on the curve would be operating in the A. forward-biased area.

B. reverse-biased area.

C. reverse-breakdown voltage region.

D. zener region.

4. In contrast to a bipolar transistor, a field-effect transistor A. requires considerable power from the signal source.

B. causes more signal distortion.

C. has a higher voltage gain.

D. has a much higher input impedance.

Use this illustration to answer the question.

5. In the circuit shown in the figure, suppose that capacitor C3 develops a short. The total measured

capacitance across terminals 1 and 2 would now become A. 0.4 μF. B. 0.35 μF. C. 0.3 μF. D. 0.15 μF.

6. Imagine that you're working with the bars shown in Figure A-1. If one end of bar A repels one end of bar B and attracts the other end of bar B, your conclusion should be that A. both bars are magnetized.

B. only bar B is magnetized.

C. either bar A or bar B is magnetized.

D. only bar A is magnetized.

Use this illustration to answer the question.

7. In the circuit shown in the figure, suppose that you momentarily press and release switch S4. For how

long would switch S3 then have to be pressed to charge capacitor C1 to 6.3 V?

A. 5 seconds

B. 10 seconds

C. 1 second

D. 15 seconds

Use this illustration to answer the question.

8. Look at the circuit diagram that's shown in the figure. The circuit output is across points B and C, so this circuit probably functions as a/an A. electronic filter.

B. temperature compensator.

C. temperature alarm.

D. voltage regulator.

9. A forward-biased PN junction will have a positive voltage applied to the P side and a _______ voltage applied to the N side. A. negative

B. higher

C. lower

D. positive

Use this illustration to answer the question.

10. In the circuit shown in the figure, suppose that you momentarily press and release switch S4, and then

press switch S2 for 1 second. What would be the voltage across capacitor C1?

A. 10 V

B. 6.3 V

C. 0 V

D. 2 V

Use this illustration to answer the question.

11. The amplifier configuration shown in the figure is called a common-_______ circuit. A. base

B. junction

C. emitter

D. collector

Use this illustration to answer the question.

12. In the circuit shown in the figure, if the voltage from the variable DC power supply was 3 V, what would be the measured voltage between points B and C? A. 0 V

B. 2.6 V

C. 3 V

D. 5.6 V

Use this illustration to answer the question.

13. In the circuit shown in the figure, the zener diode is rated at 5.6 V and is operating in the zener region. If the voltage from the variable DC power source is 10 V, what would be the measured voltage between points A and B? A. 5.6 V

B. 0 V

C. 10 V

D. 4.4 V

Use this illustration to answer the question.

14. In the circuit shown in the figure, if the voltage from the variable DC power supply was 3 V, what would be the measured voltage between points A and B? A. 3 V

B. 0 V

C. 2.6 V

D. 5.6 V

15. On a transistor specification sheet, you notice that the beta is specified as 100. Therefore, you would expect a current of 1 mA in the base circuit to produce _______ in the collector. A. 0.1 A

B. 0.001 A

C. 0.0001 A

D. 0.01 A

16. Which of the following statements about capacitors is correct? A. Capacitors connected in series combine like resistors that are connected in series.

B. Capacitors connected in series combine like resistors that are connected in parallel.

C. Capacitors connected in parallel combine like resistors that are connected in parallel.

D. Capacitors connected in parallel combine like inductors that are connected in parallel.

Use this illustration to answer the question.

17. Refer again to the characteristic curve that's shown in the figure. A diode that's used as a regulating element in a 12 V power supply would most likely be operated close to the A. depletion region, between points A and B.

B. current-limiting point (point B).

C. forward junction breakover point (point A).

D. zener point (point B).

Use this illustration to answer the question.

18. Look at the circuit diagram shown in the figure. If you momentarily press and release switch S4, and

then momentarily press switch S1, what voltage would you measure across capacitor C1?

A. 10 V

B. 0 V

C. 6.3 V

D. 22 V

Use this illustration to answer the question.

19. A transistor amplifier circuit and its characteristic curve are shown in the figure. The transistor amplifier circuit is to be biased for linear operation so that the output signal is an amplified replica of the input signal. To achieve this goal, at which of the following points on the characteristic curve should this amplifier be biased? A. Midway between points A and B

B. At point C

C. Midway between points A and C

D. At point A

Use this illustration to answer the question.

End of exam

20. The schematic symbol for an N-channel JFET is shown in the figure. For this device to be biased properly, the gate must be A. at the same potential as the source.

B. negative with respect to the source.

C. at the same potential as the drain.

D. positive with respect to the source.