Malvino Chapter 6

Chapter 6 

1. A transistor has how many doped regions? 
a. 1 
b. 2 
c. 3 
d. 4 

2. What is one important thing transistors do? 
a. Amplify weak signals 
b. Rectify line voltage 
C. Regulate voltage 
d. Emit light 

3. Who invented the first junction transistor? 
a. Bell 
b. Faraday 
c. Marconi 
d. Schockley 

4. In an npn transistor, the majority carriers in the base 
are 
a. Free electrons 
b. Holes 
c. Neither 
d. Both 

5. The barrier potential across each silicon depletion 
layer is 
a. 0 
b. 0.3 V 
c. 0.7 V 
d. 1 V 

6. The emitter diode is usually 
a. Forward-biased 
b. Reverse-biased 
c. Nonconducting 
d. Operating in the breakdown region 

7. For normal operation of the transistor, the collector 
diode has to be 
a. Forward-biased 
b. Reverse-biased 
c. Nonconducting 
d. Operating in the breakdown region 

8. The base of an npn transistor is thin and 
a. Heavily doped 
b. Lightly doped 
c. Metallic 
d. Doped by a pentavalent material 

9. Most of the electrons in the base of an npn transistor 
flow 
a. Out of the base lead 
b. Into the collector 
c. Into the emitter 
d. Into the base supply 

10. Most of the electrons inthe base of an npn transistor 
do not recombine because they 
a. Have a long lifetime 
b. Have a negative charge 
c. Must flow a long way through the base 
d. Flow out of the base 

11. Most of the electrons that flow through the base will 
a. Flow into the collector 
b. Flow out of the base lead 
c. Recombine with base holes 
d. Recombine with collector holes 

12. The current gain of a transistor is the ratio of the 
a. Collector current to emitter current 
b. Collector current to base current 
c. Base current to collector current 
d. Emitter current to collector current 

13. Increasing the collector supply voltage will increase 
a. Base current 
b. Collector current 
c. Emitter current 
d. None of the above 

14. The fact that only a few holes are in the base region 
means the base is 
a. Lightly doped 
b. Heavily doped 
c. Undoped 
d. None of the above 

15. In a normally biased npn transistor, the electrons in 
the emitter have enough energy to overcome the barrier 
potential of the 
a. Base-emitter junction 
b. Base-collector junction 
c. Collector-base junction 
d. Recombination path 

16. When a free electron recombines with a hole in the 
base region, the free electron becomes 
a. Another free electron 
b. A valence electron 
c. A conduction-band electron 
d. A majority carrier 

17. What is the most important fact about the collector 
current? 
a. It is measured in milliamperes. 
b. It equals the base current divided by the current gain. 
c. It is small. 
d. It approximately equals the emitter current. 

18. If the current gain is 200 and the collector current is 
100 mA, the base current is 
a. 0.5 mA 
b. 2 mA 
c. 2 A 
d. 20 A 

19. The base-emitter voltage is usually 
a. Less than the base supply voltage 
b. Equal to the base supply voltage 
c. More than the base supply voltage 
d. Cannot answer 

20. The collector-emitter voltage is usually 
a. Less than the collector supply voltage 
b. Equal to the collector supply voltage 
c. More than the collector supply voltage 
d. Cannot answer 

21. The power dissipated bya transistor approximately 
equals the collector current times 
a. Base-emitter voltage 
b. Collector-emitter voltage 
c. Base supply voltage 
d. 0.7 V 

22. A small collector currentwith zero base current is 
caused by the leakage current of the 
a. Emitter diode 
b. Collector diode 
c. Base diode 
d. Transistor 

23. A transistor acts like a diode and a 
a. Voltage source 
b. Current source 
c. Resistance 
d. Power supply 

24. If the base current is 100 mA and the current gain is 
30, the collector current is 
a. 300 mA 
b. 3 A 
c. 3.33 A 
d. 10 A 

25. The base-emitter voltage ofan ideal transistor is 
a. 0 
b. 0.3 V 
c. 0.7 V 
d. 1 V 

26. If you recalculate the collector-emitter voltage with 
the second approximation, the answer will usually be 
a. Smaller than the ideal value 
b.. The same as the ideal value 
c. Larger than the ideal value 
d. Inaccurate 

27. In the active region, the collector current is not 
changed significantly by 
a. Base supply voltage 
b. Base current 
c. Current gain 
d. Collector resistance 

28. The base-emitter voltage of the second 
approximation is 
a. 0 
b. 0.3 V 
c. 0.7 V 
d. 1 V 

29. If the base resistor isopen, what is the collector 
cuffent? 
a. 0 
b. 1 mA 
c. 2 mA 
d. 10 mA 




Also try:

Malvino Chapter 1
Malvino Chapter 2
Malvino Chapter 3
Malvino Chapter 4
Malvino Chapter 5
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