Question 1

What type of amplifier produces output power ranging from a few hundred milliwatts up to hundreds of watts?

Accepted Answer

A)  preamp 
B)  power amplifier 
C)  dc amplifier 
D)  RF tuned amplifier 
A)  preamp 
B)  power amplifier 
C)  dc amplifier 
D)  RF tuned amplifier

Question 2

The power rating of a transistor can be effectively increased

Accepted Answer

A)  by using bigger transistors. 
B)  by reducing power supply voltages. 
C)  by using heat sinks. 
D)  by using slow-blow fuses. 
A)  by using bigger transistors. 
B)  by reducing power supply voltages. 
C)  by using heat sinks. 
D)  by using slow-blow fuses.

Question 3

The three types of amplifier coupling methods are capacitive,transformer,and inductive.

Accepted Answer

A) True 
 B)False

Question 4

If a transistor's ambient temperature is above 25°C

Accepted Answer

A)  the power rating must be derated. 
B)  the power rating must be increased. 
C)  the power rating is invalid. 
D)  the power rating must be maximum. 
A)  the power rating must be derated. 
B)  the power rating must be increased. 
C)  the power rating is invalid. 
D)  the power rating must be maximum.

Question 5

The amplifier stage that precedes the output stage is the driver.

Accepted Answer

A) True 
 B)False

Question 6

A radio frequency amplifier is one that amplifies frequencies above 20 kHz.

Accepted Answer

A) True 
 B)False

Question 7

A class AB amplifier is defined as an amplifier with a conduction angle between 180° and 360°.

Accepted Answer

A) True 
 B)False

Question 8

What factor places a limit on the allowable power dissipation of a transistor?

Accepted Answer

A)  power supply 
B)  transistor case style 
C)  emitter-base junction 
D)  temperature at the collector junction 
A)  power supply 
B)  transistor case style 
C)  emitter-base junction 
D)  temperature at the collector junction

Question 9

An advantage of a class B amplifier is

Accepted Answer

A)  simplicity of design. 
B)  higher stage efficiency. 
C)  that current flows for the entire ac cycle. 
D)  that RF tuned circuits are used. 
A)  simplicity of design. 
B)  higher stage efficiency. 
C)  that current flows for the entire ac cycle. 
D)  that RF tuned circuits are used.

Question 10

If an amplifier circuit has a high quality factor (Q),the bandwidth is

Accepted Answer

A)  large. 
B)  small. 
C)  equal to the upper half-power frequency. 
D)  dependant on the power supply. 
A)  large. 
B)  small. 
C)  equal to the upper half-power frequency. 
D)  dependant on the power supply.

Question 11

Harmonics are

Accepted Answer

A)  multiples of a frequency. 
B)  instruments that provide sounds with metal reeds. 
C)  circuits used in audio amplifiers. 
D)  equations used in amplifier design. 
A)  multiples of a frequency. 
B)  instruments that provide sounds with metal reeds. 
C)  circuits used in audio amplifiers. 
D)  equations used in amplifier design.

Question 12

Amplifiers can be described by

Accepted Answer

A)  their interstage coupling. 
B)  types of transistors used. 
C)  power supplies used. 
D)  power output. 
A)  their interstage coupling. 
B)  types of transistors used. 
C)  power supplies used. 
D)  power output.

Question 13

The efficiency of an amplifier is equal to dc output power divided by the ac input power.

Accepted Answer

A) True 
 B)False

Question 14

In a well-designed large-signal amplifier,we get a maximum peak-to-peak unclipped output which is referred to as

Accepted Answer

A)  ac output compliance. 
B)  dc output compliance. 
C)  peak compliance. 
D)  complementary compliance. 
A)  ac output compliance. 
B)  dc output compliance. 
C)  peak compliance. 
D)  complementary compliance.

Question 15

Types of amplifier coupling do not include ________.

Accepted Answer

A)  transistor 
B)  direct 
C)  capacitive 
D)  transformer 
A)  transistor 
B)  direct 
C)  capacitive 
D)  transformer

Question 16

The type of amplifier coupling that can couple 0 Hz is ________.

Accepted Answer

A)  direct 
B)  capacitive 
C)  transformer 
D)  transistor 
A)  direct 
B)  capacitive 
C)  transformer 
D)  transistor

Question 17

When a tank circuit is resonant,the ac load impedance seen by the collector current source is

Accepted Answer

A)  maximum and purely resistive. 
B)  maximum and inductive. 
C)  minimum and purely resistive. 
D)  maximum and capacitive. 
A)  maximum and purely resistive. 
B)  maximum and inductive. 
C)  minimum and purely resistive. 
D)  maximum and capacitive.

Question 18

With a class A amplifier,collector current flows throughout the cycle.

Accepted Answer

A) True 
 B)False

Question 19

Cutoff and saturation clipping are undesirable because they distort the signal.

Accepted Answer

A) True 
 B)False

Question 20

Class B and AB amplifiers require a stable operating point near cut-off.

Accepted Answer

A) True 
 B)False

Exam 10: Power Amplifiers

What type of amplifier produces output power ranging from a few hundred milliwatts up to hundreds of watts?

The power rating of a transistor can be effectively increased

The three types of amplifier coupling methods are capacitive,transformer,and inductive.

If a transistor's ambient temperature is above 25°C

The amplifier stage that precedes the output stage is the driver.

A radio frequency amplifier is one that amplifies frequencies above 20 kHz.

A class AB amplifier is defined as an amplifier with a conduction angle between 180° and 360°.

What factor places a limit on the allowable power dissipation of a transistor?

An advantage of a class B amplifier is

If an amplifier circuit has a high quality factor (Q),the bandwidth is

Harmonics are

Amplifiers can be described by

The efficiency of an amplifier is equal to dc output power divided by the ac input power.

In a well-designed large-signal amplifier,we get a maximum peak-to-peak unclipped output which is referred to as

Types of amplifier coupling do not include ________.

The type of amplifier coupling that can couple 0 Hz is ________.

When a tank circuit is resonant,the ac load impedance seen by the collector current source is

With a class A amplifier,collector current flows throughout the cycle.

Cutoff and saturation clipping are undesirable because they distort the signal.

Class B and AB amplifiers require a stable operating point near cut-off.

Introduction

Semoconductors

Diode Theory Key

Diode Circuits

Special-Purpose Diodes Key

BJT Fumdamentals

BJT Biasing

Basic BJT Amplifiers

Multistage,CC,and CB Amplifiers

JFETS

Mosfets

Thyristors

Frequency Effects

Differential Amplifiers

Operational Amplifiers

Negative Feedback

Linear OP AMP Circuits

Active Filters Key

Nonlinear Op-Amp Circuit Applications Key

Oscillators Key

Regulated Power Supplies Key

Filters