Chapter 28: Amplifier Basics
MULTIPLE CHOICE
1. In each configuration of transistor amplifier circuits, the ____ junction is forward biased, while the
collector-base junction is reverse biased.
a.
emitter-collector
c.
collector-emitter
b.
base-emitter
d.
emitter-base
2. All transistor amplifiers require ____ voltage(s) for proper biasing.
a.
one
c.
three
b.
two
d.
four
3. An amplifier that is biased so that the current flows throughout the entire cycle is operating as a ____
amplifier.
a.
class A
c.
class B
b.
class AB
d.
class C
4. An amplifier that is biased so that the output current flows for less than a full cycle but more than a
half cycle is operating as a ____ amplifier.
a.
class A
c.
class B
b.
class AB
d.
class C
5. An amplifier that is biased so that the output current flows for only half of the input cycle is operating
as a ____ amplifier.
a.
class A
c.
class B
b.
class AB
d.
class C
6. An amplifier that is biased so that the output current flows for less than half of the AC input cycle is
operating as a ____ amplifier.
a.
class A
c.
class B
b.
class AB
d.
class C
7. ____ amplifiers find wide application where the full signal must be maintained, as in the amplification
of audio signals in radios and televisions.
a.
Class A
c.
Class B
b.
Class AB
d.
Class C
8. ____ amplifiers are used as output stages of stereo systems and public address amplifiers, and in many
industrial controls.
a.
Class A
c.
Class B
b.
Class AB
d.
Class C
9. ____ amplifiers are used for high-power amplifiers and transmitters where only a single frequency is
amplified, such as the RF (radio frequency) carrier used for radio and television transmission.
a.
Class A
c.
Class B
b.
Class AB
d.
Class C
10. ____ amplifiers provide a uniform current or voltage gain over a wide range of frequencies.
a.
Transformer-coupled
c.
Impedance-coupled
b.
Direct-coupled
d.
RC-coupled
COMPLETION
1. ____________________ are electronic circuits that are used to increase the amplitude of an electronic
signal.
2. In a(n) ____________________ circuit, the purpose of the voltage divider is to establish a constant
voltage from the base of the transistor to ground.
3. To prevent one amplifier’s bias voltage from affecting the operation of the second amplifier, a(n)
____________________ technique must be used.
SHORT ANSWER
1. Describe the characteristics of the common-emitter circuit.
2. Describe the disadvantage of the direct-coupling technique.
