Malvino Chapter 3 With Answers Electronics ECE Board Exam

Malvino Chapter 3 With Answers Electronics ECE Board Exam

1 . When the graph of current versus voltage is a straight line, the device is referred to as

a. Active

b. Linear

c. Nonlinear

d. Passive

b

2. What kind of device is a resistor?

a. Unilateral

b. Linear

c. Nonlinear

d. Bipolar

b

3. What kind of a device is a diode?

a. Bilateral

b. Linear

c. Nonlinear

d. Unipolar

c

4. How is a nonconducting diode biased?

a. Forward

b. Inverse

c. Poorly

d. Reverse

d

5. When the diode current is large, the bias is

a. Forward

b. Inverse

c. Poor

d. Reverse

a

6. The knee voltage of a diode is approximately equal to the

a. Applied voltage

b. Barrier potential

c. Breakdown voltage

d. Forward voltage

b

7. The reverse current consists of minority-carrier current and

a. Avalanche current

b. Forward current

c. Surface-leakage current

d. Zener current

c

8. How much voltage is there across the second approximation of a silicon diode when it is forward biased?

a. 0

b. 0.3 V

c. 0.7 V

d. 1 V

c

9. How much current is there through the second approximation of a silicon diode when it is reverse biased?

a. 0

b. 1 mA

c. 300 mA

d. None of the above

a

10. How much forward diode voltage is there with the ideal-diode approximation?

a. 0

b. 0.7 V

c. More than 0.7 V

d. 1 V

a

11. The bulk resistance of a 1N4001 is

a. 0

b. 0.23 ohm                        

c. 10 ohm            

d. 1 kohm

b

12. If the bulk resistance is zero, the graph above the knee becomes

a. Horizontal

b. Vertical

c. Tilted at 450

d. None of the above

b

13. The ideal diode is usually adequate when

a. Troubleshooting

b. Doing precise calculations

c. The source voltage is low

d. The load resistance is low

a

14. The second approximation works well when

a. Troubleshooting

b. Load resistance is high

c. Source voltage is high

d. All of the above

d

15. The only time you have to use the third approximation is when

a. Load resistance is low

b. Source voltage is high

c. Troubleshooting

d. None of the above

a

16. How much load current is there in Fig. 3-19 (see your textbook) with the ideal diode?

a. 0

b. 14.3 mA

c. 15 mA

d. 50 mA

c

17. How much load current is there in Fig. 3-19 (see your textbook) with the second approximation?

a. 0

b. 14.3 mA

c. 15 mA

d. 50 mA

b

18. How much load current is there in Fig. 3-19 with the third approximation?

a. 0

b. 14.3 mA

c. 15 mA

d. 50 mA

b

19. If the diode is open in Fig. 3-19, the load voltage is

a. 0

b. 14.3 V

c. 20 V

d. -15 V

a

20. If the resistor is ungrounded in Fig. 3-19, the voltage measured with a DMM between the top of the resistor and ground is

closest to

a. 0

b. 15 V

c. 20 V

d. -15 V

b

21. The load voltage measures zero in Fig. 3-19. The trouble may be

a. A shorted diode

b. An open diode

c. An open load resistor

d. Too much supply voltage

b