Question 1

The characteristics of a class ______________ amplifier include both low distortion and low power efficiency.

Accepted Answer

A

Question 2

To provide a linear output, many class B push-pull audio amplifiers are biased to operate as what class amplifier?

Accepted Answer

A)  A 
B)  AB 
C)  C 
D)  D 
A)  A 
B)  AB 
C)  C 
D)  D B

Question 3

The percentage of the ac input cycle that produces an output current defines the

Accepted Answer

A)  operating point for an amplifier 
B)  number of possible amplifier stages 
C)  class of operation for an amplifier 
D)  amount of biasing required for linear operation 
A)  operating point for an amplifier 
B)  number of possible amplifier stages 
C)  class of operation for an amplifier 
D)  amount of biasing required for linear operation C

Question 4

Typical class C amplifiers have efficiencies of approximately

Accepted Answer

A)  5% 
B)  20% 
C)  50% 
D)  90% 
A)  5% 
B)  20% 
C)  50% 
D)  90%

Question 5

What is typically used to reproduce a full sine-wave at its output for each short pulse of collector current in a class C amplifier?

Accepted Answer

A)  Oscillator circuit 
B)  Regulator circuit 
C)  Tank circuit 
D)  Bridge circuit 
A)  Oscillator circuit 
B)  Regulator circuit 
C)  Tank circuit 
D)  Bridge circuit

Question 6

The collector current for a transistor in a class C amplifier flows for ______________ degrees or less of the input waveform.

Accepted Answer

The answer of The collector current for a transistor in...

Question 7

Tuned class C amplifiers can be used as frequency ______________ by tuning the LC tank circuit to a harmonic of the input frequency.

Accepted Answer

The answer of Tuned class C amplifiers can be used...

Question 8

The class of operation for an amplifier is defined by the percentage of the ac input cycle that produces an output current.

Accepted Answer

A) True 
 B)False

Question 9

The collector current of a transistor in a class A amplifier flows for

Accepted Answer

A)  approximately 60° of the input waveform 
B)  approximately 120° of the input waveform 
C)  180° of the input waveform 
D)  360° of the input waveform 
A)  approximately 60° of the input waveform 
B)  approximately 120° of the input waveform 
C)  180° of the input waveform 
D)  360° of the input waveform

Question 10

______________ bias is a form of biasing for class B push-pull amplifiers that uses diodes to provide a slight amount of forward bias for the base-emitter junctions of each transistor.

Accepted Answer

The answer of ______________ bias is a form of biasing...

Question 11

With class ______________ operation, crossover distortion is entirely eliminated.

Accepted Answer

The answer of With class ______________ operation, crossover distortion is...

Question 12

Class C amplifiers can be used in tuned rf amplifiers where undesired ______________ frequencies can be filtered out.

Accepted Answer

The answer of Class C amplifiers can be used in...

Question 13

. The three general classes for power amplifiers are class A, class B, and class C.

Accepted Answer

A) True 
 B)False

Question 14

The main disadvantage of a class B or AB operation is that two ______________ must be used to get a linear reproduction of the input waveform being applied.

Accepted Answer

The answer of The main disadvantage of a class B...

Question 15

Coupling and bypass capacitors affect the output of an amplifier at low frequencies.

Accepted Answer

A) True 
 B)False

Question 16

What is the form of bias used for class B push-pull amplifiers that uses diodes to provide a slight amount of forward bias for the base-emitter junctions of each transistor?

Accepted Answer

A)  Voltage-divider bias 
B)  Self-bias 
C)  Diode bias 
D)  Current-source bias 
A)  Voltage-divider bias 
B)  Self-bias 
C)  Diode bias 
D)  Current-source bias

Question 17

The voltage gain of a class C rf amplifier is maximum

Accepted Answer

A)  below the resonant frequency of the tank circuit 
B)  at the resonant frequency of the tank circuit 
C)  above the resonant frequency of the tank circuit 
D)  at audio frequencies only 
A)  below the resonant frequency of the tank circuit 
B)  at the resonant frequency of the tank circuit 
C)  above the resonant frequency of the tank circuit 
D)  at audio frequencies only

Question 18

A true class B amplifier is biased such that the Q point is located at

Accepted Answer

A)  the center of the load line 
B)  cutoff 
C)  saturation 
D)  the linear portion of the load line 
A)  the center of the load line 
B)  cutoff 
C)  saturation 
D)  the linear portion of the load line

Question 19

Which of the following is not an amplifier class?

Accepted Answer

A)  A 
B)  B 
C)  BC 
D)  C 
A)  A 
B)  B 
C)  BC 
D)  C

Question 20

Those frequencies in which the voltage gain is 70.7% or more of its maximum at resonance is referred to as the

Accepted Answer

A)  frequency response 
B)  frequency range 
C)  bandpass 
D)  bandwidth 
A)  frequency response 
B)  frequency range 
C)  bandpass 
D)  bandwidth

Exam 33: Power Amplifiers

The characteristics of a class ______________ amplifier include both low distortion and low power efficiency.

To provide a linear output, many class B push-pull audio amplifiers are biased to operate as what class amplifier?

The percentage of the ac input cycle that produces an output current defines the

Typical class C amplifiers have efficiencies of approximately

What is typically used to reproduce a full sine-wave at its output for each short pulse of collector current in a class C amplifier?

The collector current for a transistor in a class C amplifier flows for ______________ degrees or less of the input waveform.

Tuned class C amplifiers can be used as frequency ______________ by tuning the LC tank circuit to a harmonic of the input frequency.

The class of operation for an amplifier is defined by the percentage of the ac input cycle that produces an output current.

The collector current of a transistor in a class A amplifier flows for

______________ bias is a form of biasing for class B push-pull amplifiers that uses diodes to provide a slight amount of forward bias for the base-emitter junctions of each transistor.

With class ______________ operation, crossover distortion is entirely eliminated.

Class C amplifiers can be used in tuned rf amplifiers where undesired ______________ frequencies can be filtered out.

. The three general classes for power amplifiers are class A, class B, and class C.

The main disadvantage of a class B or AB operation is that two ______________ must be used to get a linear reproduction of the input waveform being applied.

Coupling and bypass capacitors affect the output of an amplifier at low frequencies.

What is the form of bias used for class B push-pull amplifiers that uses diodes to provide a slight amount of forward bias for the base-emitter junctions of each transistor?

The voltage gain of a class C rf amplifier is maximum

A true class B amplifier is biased such that the Q point is located at

Which of the following is not an amplifier class?

Those frequencies in which the voltage gain is 70.7% or more of its maximum at resonance is referred to as the

Introduction

Electricity

Resistors

Ohms Law

Series Circuits

Parallel Circuits

Series-Parallel Circuits

Voltage Dividers and Current Dividers

Analog and Digital Multimeters

Kirchhoff S Laws

Network Theorems

Conductors and Insulators

Batteries

Magnetism

Electromagnetism

Alternating Voltage and Current

Capacitance

Capacitive Reactance

Capacitive Circuits

Inductance

Inductive Reactance

Inductive Circuits

RC and LR Time Constants

Alternating Current Circuits

Complex Numbers for Ac Circuits

Resonance

Filters

Three-Phase Ac Power Systems

Diodes and Diode Applications

Bipolar Junction Transistors

Transistor Amplifiers

Field Effect Transistors

Thyristors

Operational Amplifiers

Filters