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
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