Question 1

If excessive hum is heard coming out of a loudspeaker,one of the prime suspects is a shorted diode in the power supply.

Accepted Answer

A) True 
 B)False  False

Question 2

The ac resistance of the emitter diode equals the ac base-emitter voltage divided by the ac emitter current.

Accepted Answer

A) True 
 B)False  True

Question 3

Distortion is undesirable in high-fidelity amplifiers because

Accepted Answer

A)  it changes the sound of voice and music. 
B)  it amplifies the sound of voice and music. 
C)  it trips a circuit breaker. 
D)  it cannot be heard in either speaker. 
A)  it changes the sound of voice and music. 
B)  it amplifies the sound of voice and music. 
C)  it trips a circuit breaker. 
D)  it cannot be heard in either speaker. A

Question 4

Coupling capacitors can be approximated as dc shorts.

Accepted Answer

A) True 
 B)False

Question 5

When all components are simultaneously created and connected on a piece of semiconductor material,it is referred to as what kind of circuit?

Accepted Answer

A)  discrete 
B)  integrated 
C)  chat 
D)  protection 
A)  discrete 
B)  integrated 
C)  chat 
D)  protection

Question 6

The amplifier shown in Figure 8-4 is

Accepted Answer

A)  an emitter-biased amplifier. 
B)  a base-biased amplifier. 
C)  a common collector. 
D)  an emitter follower. 
A)  an emitter-biased amplifier. 
B)  a base-biased amplifier. 
C)  a common collector. 
D)  an emitter follower.

Question 7

In order to calculate the collector current for the circuit shown in Figure 8-2 (a),you must

Accepted Answer

A)  divide 15 V by 100. 
B)  multiply the base current by 100. 
C)  multiply 0.7 V by 100. 
D)  divide 30 V by 5 kW. 
A)  divide 15 V by 100. 
B)  multiply the base current by 100. 
C)  multiply 0.7 V by 100. 
D)  divide 30 V by 5 kW.

Question 8

A bypass capacitor appears

Accepted Answer

A)  shorted to dc. 
B)  open to ac. 
C)  open to dc. 
D)  like a semiconductor. 
A)  shorted to dc. 
B)  open to ac. 
C)  open to dc. 
D)  like a semiconductor.

Question 9

In transistor amplifier notation,lowercase letters and subscripts are used for

Accepted Answer

A)  dc quantities. 
B)  ac quantities. 
C)  schematic symbols. 
D)  labeling filters. 
A)  dc quantities. 
B)  ac quantities. 
C)  schematic symbols. 
D)  labeling filters.

Question 10

One way to stabilize voltage gain is to leave some of the emitter resistance unbypassed.

Accepted Answer

A) True 
 B)False

Question 11

An equivalent transistor circuit model used to analyze ac signal processing that looks like a T on its side is the

Accepted Answer

A)  Fourier model. 
B)  p model. 
C)  Thevenin model. 
D)  Ebers-Moll model. 
A)  Fourier model. 
B)  p model. 
C)  Thevenin model. 
D)  Ebers-Moll model.

Question 12

A swamped amplifier decreases input impedance and increases distortion.

Accepted Answer

A) True 
 B)False

Question 13

The voltage gain of an amplifier is defined as the ac output voltage divided by the ac input voltage.

Accepted Answer

A) True 
 B)False

Question 14

When coupling an ac signal from stage to stage,the capacitive reactance should be at least

Accepted Answer

A)  10 times smaller than the resistance at the lowest frequency of operation. 
B)  100 times smaller than the resistance at the lowest frequency of operation. 
C)  10 times larger than the resistance at the lowest frequency of operation. 
D)  10 times smaller than the resistance at the highest frequency of operation. 
A)  10 times smaller than the resistance at the lowest frequency of operation. 
B)  100 times smaller than the resistance at the lowest frequency of operation. 
C)  10 times larger than the resistance at the lowest frequency of operation. 
D)  10 times smaller than the resistance at the highest frequency of operation.

Question 15

In the circuit shown in Figure 8-4,what effect do the capacitors have on the dc biasing?

Accepted Answer

A)  add 0.7 V 
B)  add 15 V 
C)  puts transistor in cutoff 
D)  no effect 
A)  add 0.7 V 
B)  add 15 V 
C)  puts transistor in cutoff 
D)  no effect

Question 16

The stretching and compressing of alternate half cycles at the output of a transistor amplifier is called ________.

Accepted Answer

A)  oscillation 
B)  amplification 
C)  distortion 
D)  extortion 
A)  oscillation 
B)  amplification 
C)  distortion 
D)  extortion

Question 17

The base current for the circuit shown in Figure 8-2 (a)can be determined by

Accepted Answer

A)  dividing 100 by 5 kW. 
B)  dividing 30 V by 5 kW. 
C)  dividing 30 V by 1 MW. 
D)  dividing 15 V by 100. 
A)  dividing 100 by 5 kW. 
B)  dividing 30 V by 5 kW. 
C)  dividing 30 V by 1 MW. 
D)  dividing 15 V by 100.

Question 18

A bypass capacitor is similar to a coupling capacitor because it appears open to dc and shorted to ac.

Accepted Answer

A) True 
 B)False

Question 19

What is the mathematical approach that models the transistor on what is happening at its terminals without regard for the physical processes taking place inside the transistor?

Accepted Answer

A)  small-signal characteristics 
B)  Thevenin's Theorem 
C)  Kirchoff's Laws 
D)  h parameters 
A)  small-signal characteristics 
B)  Thevenin's Theorem 
C)  Kirchoff's Laws 
D)  h parameters

Question 20

The simplest way to analyze an amplifier is to split the analysis into what two parts?

Accepted Answer

A)  schematics and values 
B)  amplifiers and oscillators 
C)  dc and ac 
D)  semiconductors and conductors 
A)  schematics and values 
B)  amplifiers and oscillators 
C)  dc and ac 
D)  semiconductors and conductors

Exam 7: Basic BJT Amplifiers

If excessive hum is heard coming out of a loudspeaker,one of the prime suspects is a shorted diode in the power supply.

The ac resistance of the emitter diode equals the ac base-emitter voltage divided by the ac emitter current.

Distortion is undesirable in high-fidelity amplifiers because

Coupling capacitors can be approximated as dc shorts.

When all components are simultaneously created and connected on a piece of semiconductor material,it is referred to as what kind of circuit?

The amplifier shown in Figure 8-4 is

In order to calculate the collector current for the circuit shown in Figure 8-2 (a),you must

A bypass capacitor appears

In transistor amplifier notation,lowercase letters and subscripts are used for

One way to stabilize voltage gain is to leave some of the emitter resistance unbypassed.

An equivalent transistor circuit model used to analyze ac signal processing that looks like a T on its side is the

A swamped amplifier decreases input impedance and increases distortion.

The voltage gain of an amplifier is defined as the ac output voltage divided by the ac input voltage.

When coupling an ac signal from stage to stage,the capacitive reactance should be at least

In the circuit shown in Figure 8-4,what effect do the capacitors have on the dc biasing?

The stretching and compressing of alternate half cycles at the output of a transistor amplifier is called ________.

The base current for the circuit shown in Figure 8-2 (a)can be determined by

A bypass capacitor is similar to a coupling capacitor because it appears open to dc and shorted to ac.

What is the mathematical approach that models the transistor on what is happening at its terminals without regard for the physical processes taking place inside the transistor?

The simplest way to analyze an amplifier is to split the analysis into what two parts?

Introduction

Semoconductors

Diode Theory Key

Diode Circuits

Special-Purpose Diodes Key

BJT Fumdamentals

BJT Biasing

Multistage,CC,and CB Amplifiers

Power 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