Malvino Chapter 5

Chapter 5 

1. What is true about the breakdown voltage in a zener 
diode? 
a. It decreases when current increases. 
b. It destroys the diode. 
c. It equals the current times the resistance. 
d. It is approximately constant. 

2. Which of these is the best description of a zener 
diode? 
a. It is a rectifier diode. 
b. It is a constant-voltage device. 
c. It is a constant-cuffent device. 
d. It works in the forward region. 

3. A zener diode 
a. Is a battery 
b. Has a constant voltage in the breakdown region 
c. Has a barrier potential of 1 V 
d. Is forward-biased 

4. The voltage across the zener resistance is usually 
a. Small 
b. Large 
c. Measured in volts 
d. Subtracted from the breakdown voltage 

5. If the series resistance decreases in an unloaded 
zener regulator, the zener current 
a. Decreases 
b. Stays the same 
c. Increases 
d. Equals the voltage divided by the resistance 

6.In the second approximation, the total voltage across 
the zener diode is the sum of-the breakdown voltage and 
the voltage across the 
a. Source 
b. Series resistor 
c. Zener resistance 
d. Zener diode 

7. The load voltage is approximately constant when a 
zener diode is 
a. Forward-biased 
b. Reverse-biased 
c. Operating in the breakdown region 
d. Unbiased 

8. In a loaded zener regulator, which is the largest 
current? 
a. Series current 
b. Zener current 
c. Load current 
d. None of these 

9. If the load resistance decreases in a zener regulator, 
the zener current 
a. Decreases 
b. Stays the same 
c. Increases 
d. Equals the source voltage divided by the series 
resistance 

10. If the load resistance decreases in a zener regulator, 
the series current 
a. Decreases 
b. Stays the same 
c. Increases 
d. Equals the source voltage divided by the series 
resistance 

11. When the source voltage increases in a zener 
regulator, which of these currents remains approximately 
constant? 
a. Series current 
b. Zener current 
c. Load current 
d. Total current 

12. If the zener diode in a zener regulator is connected 
with the wrong polarity, the load voltage will be closest to 
a. 0.7 V 
b. 10 V 
c. 14 V 
d. 18 V 

13. At high frequencies, ordinary diodes don't work 
properly because of 
a. Forward bias 
b. Reverse bias 
c. Breakdown 
d. Charge storage 

14. The capacitance of a varactor diode increases when 
the reverse voltage across it 
a. Decreases 
b. Increases 
c. Breaks down 
d. Stores charges 

15. Breakdown does not destroy a zener diode provided 
the zener current is less than the 
a. Breakdown voltage 
b. Zener test current 
c. Maximum zener current rating 
d. Banier potential 

16. To display the digit 8 ina seven-segment indicator, 
a. C must be lighted 
b. G must be off 
c. F must be on 
d. All segments must be on 

17. A photodiode is normally 
a. Forward-biased 
b. Reverse-biased 
c. Neither forward- nor reverse-biased 
d. Emitting light 

18. When the light increases, the reverse minority carrier 
current in a photodiode 
a. Decreases 
b. Increases 
c. Is unaffected 
d. Reverses direction 

19. The device associated with voltage-controlled 
capacitance is a 
a. Light-emitting diode 
b. Photodiode 
c. Varactor diode 
d. Zener diode 

20. If the depletion layer gets wider, the capacitance 
a. Decreases 
b. Stays the same 
c. Increases 
d. Is variable 

21. When the reverse voltage increases, the capacitance 
a. Decreases 
b. Stays the same 
c. Increases 
d. Has more bandwidth 

22. The varactor is usually 
a. Forward-biased 
b. Reverse-biased 
c. Unbiased 
d. Operated in the breakdown region 

23. The device to use for rectifying a weak ac signal is a 
a. Zener diode 
b. Light-emitting diode 
c. Varistor 
d. Back diode 

24. Which of the following has a negative-resistance 
region? 
a. Tunnel diode 
b. Step-recovery diode 
c. Schottky diode 
d. Optocoupler 

25. A blown-fuse indicator uses a 
a. Zener diode 
b. Constant-cuffent diode 
c. Light-emitting diode 
d. Back diode 

26. To isolate an output circuit from an input circuit, which 
is the device to use? 
a. Back diode 
b. Optocoupler 
c. Seven-segment indicator 
d. Tunnel diode 

27. The diode with a forward voltage drop of 
approximately 0.25 V is the 
a. Step-recovery diode 
b. Schottky diode 
c. Back diode 
d. Constant-current diode 

28. For typical operation, you need to use reverse bias 
with a 
a. Zener diode 
b. Photodiode 
c. Varactor 
d. All of the above 




Also try:

Malvino Chapter 1
Malvino Chapter 2
Malvino Chapter 3
Malvino Chapter 4
Malvino Chapter 6
Malvino Chapter 7
Malvino Chapter 8
Malvino Chapter 9
Malvino Chapter 10
Malvino Chapter 11
Malvino Chapter 12
Malvino Chapter 13
Malvino Chapter 14
Malvino Chapter 15
Malvino Chapter 16
Malvino Chapter 17
Malvino Chapter 18
Malvino Chapter 19
Malvino Chapter 20
Malvino Chapter 21
Malvino Chapter 22
Malvino Chapter 23
Malvino Chapter 24