Chapter 22: Bipolar Transistors
MULTIPLE CHOICE
1. A transistor consists of ____ alternately doped regions.
a.
two
c.
four
b.
three
d.
five
2. Most transistors are identified by a number. This number begins with a 2 and the letter N and has up to
____ more digits.
a.
two
c.
four
b.
three
d.
five
3. In a transistor, the barrier voltage is produced across the ____ junction.
a.
emitter-base
c.
collector-emitter
b.
collector-base
d.
emitter-external voltage
4. As in diodes, the internal barrier voltage is 0.3 V for ____ transistors and 0.7 V for ____ transistors.
a.
carbon, silicon
c.
silicon, carbon
b.
silicon, germanium
d.
germanium, silicon
5. The reverse-bias voltage applied to the collector-base junction is usually ____ the forward-bias voltage
across the emitter-base junction.
a.
much lower than
c.
equal to
b.
much higher than
d.
zero with respect to
6. In testing a transistor with an ohmmeter, in one meter connection the resistance should be high, ____
ohms or more.
a.
1,000
c.
10,000
b.
5,000
d.
15,000
7. Each junction of a transistor exhibits a ____ resistance when it is forward biased and a ____ resistance
when reverse biased.
a.
low, high
c.
negative, positive
b.
high, low
d.
positive, negative
8. The ____ in the ohmmeter is the source of the forward- and reverse-bias voltage.
a.
generator
c.
conductor
b.
resistor
d.
battery
9. An ____ can not only determine whether the transistor is good or defective, but also determine the
leakage current.
a.
ohmmeter
c.
out-of-circuit transistor tester
b.
in-circuit transistor tester
d.
ammeter
10. If the collector voltage is ____ the emitter voltage, then it is an NPN device.
a.
negative with respect to
c.
positive with respect to
b.
zero with respect to
d.
equal to
COMPLETION
1. The most common transistor package identifier consists of the letters ____________________
followed by a number.
2. In a properly biased transistor, the ____________________ is forward biased and the collector
junction is reverse biased.
3. There are two methods for checking a transistor to determine if it is functioning properly: with a(n)
____________________ and with a transistor tester.
SHORT ANSWER
1. List the various ways of classifying transistors.
2. Describe the purposes of the transistor package.
