Question 1

The impedance of a capacitor is inversely proportional to the frequency and the capacitor effectively blocks dc voltage.

Accepted Answer

A) True 
 B)False

Question 2

Discrete means all components like resistors,capacitors,and transistors are created and connected on a chip,a piece of semiconductor material.

Accepted Answer

A) True 
 B)False

Question 3

What is the most popular circuit model that is used to analyze how a transistor behaves when an ac signal is present?

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 4

Which statement is true with regard to the circuit shown in Figure 8-4?

Accepted Answer

A)  the ac signal out of the transistor is amplified and inverted 
B)  the ac signal out of the transistor is amplified and in-phase with the input 
C)  the ac signal out of the transistor is not amplified 
D)  the ac signal out of the transistor is attenuated 
A)  the ac signal out of the transistor is amplified and inverted 
B)  the ac signal out of the transistor is amplified and in-phase with the input 
C)  the ac signal out of the transistor is not amplified 
D)  the ac signal out of the transistor is attenuated

Question 5

Voltage gain is ac output voltage divided by the ac input voltage.

Accepted Answer

A) True 
 B)False

Question 6

Amplified ripple out of a loudspeaker is detected as

Accepted Answer

A)  sine waves. 
B)  high pitch noise. 
C)  high frequency signals. 
D)  low frequency hum. 
A)  sine waves. 
B)  high pitch noise. 
C)  high frequency signals. 
D)  low frequency hum.

Question 7

In the circuit shown in Figure 8-30,if the collector voltage is 0 V and the base voltage is 0 V,what is the trouble?

Accepted Answer

A)  1 mV generator open 
B)  C1 open 
C)  C3 shorted 
D)  +10 V supply is faulty 
A)  1 mV generator open 
B)  C1 open 
C)  C3 shorted 
D)  +10 V supply is faulty

Question 8

One way to reduce distortion in a transistor amplifier is to keep the base ac input voltage small.

Accepted Answer

A) True 
 B)False

Question 9

What is one way to minimize distortion?

Accepted Answer

A)  use batteries only 
B)  keep amplifier dc supply voltages low 
C)  use ICs 
D)  keep ac base voltages small 
A)  use batteries only 
B)  keep amplifier dc supply voltages low 
C)  use ICs 
D)  keep ac base voltages small

Question 10

The ac current gain equals the ac collector current divided by the ac base current.

Accepted Answer

A) True 
 B)False

Question 11

The ac equivalent circuit model called the Ebers-Moll looks like a P on its side and is sometimes called a P model.

Accepted Answer

A) True 
 B)False

Question 12

What makes the p model,an equivalent transistor circuit model,easier to use than other models?

Accepted Answer

A)  it shows input impedance 
B)  it uses Ohm's Law 
C)  it uses calculus 
D)  it shows output impedance 
A)  it shows input impedance 
B)  it uses Ohm's Law 
C)  it uses calculus 
D)  it shows output impedance

Question 13

In order for a bypass capacitor to work properly,its reactance must be

Accepted Answer

A)  much smaller than the resistance. 
B)  much larger than the resistance. 
C)  equal to the resistance. 
D)  infinite. 
A)  much smaller than the resistance. 
B)  much larger than the resistance. 
C)  equal to the resistance. 
D)  infinite.

Question 14

The circuit shown in Figure 8-30 has an ac emitter voltage of 0.75 mV and an ac collector voltage of 5 mV.What is the trouble?

Accepted Answer

A)  C3 open 
B)  C3 shorted 
C)  C2 open 
D)  C2 shorted 
A)  C3 open 
B)  C3 shorted 
C)  C2 open 
D)  C2 shorted

Question 15

In the circuit shown in Figure 8-30,if the ac collector voltage is 2 mV and the dc collector voltage is 6 V,what is the trouble?

Accepted Answer

A)  C1 is shorted 
B)  C1 is open 
C)  +10 V supply is faulty 
D)  2.2 kΩ resistor is open 
A)  C1 is shorted 
B)  C1 is open 
C)  +10 V supply is faulty 
D)  2.2 kΩ resistor is open

Question 16

In the circuit shown in Figure 8-8,if an ac voltage was measured between the emitter and ground

Accepted Answer

A)  this is normal. 
B)  this means the amplifier is in cutoff. 
C)  this means that the bypass capacitor is open. 
D)  this means the transistor is open. 
A)  this is normal. 
B)  this means the amplifier is in cutoff. 
C)  this means that the bypass capacitor is open. 
D)  this means the transistor is open.

Question 17

The ac output voltage of an amplifier divided by the ac input voltage is referred to as the amplifier's

Accepted Answer

A)  power output. 
B)  power gain. 
C)  voltage gain. 
D)  beta. 
A)  power output. 
B)  power gain. 
C)  voltage gain. 
D)  beta.

Question 18

The voltage gain equals the ac collector resistance divided by the ac resistance of the collector diode.

Accepted Answer

A) True 
 B)False

Question 19

The reactance of a coupling capacitor at dc voltage is ________.

Accepted Answer

A)  zero 
B)  infinite 
C)  100 kW 
D)  1.414 W 
A)  zero 
B)  infinite 
C)  100 kW 
D)  1.414 W

Question 20

When a single or double stage amplifier is not working,troubleshooting can begin by measuring dc voltages.

Accepted Answer

A) True 
 B)False

Exam 7: Basic BJT Amplifiers

The impedance of a capacitor is inversely proportional to the frequency and the capacitor effectively blocks dc voltage.

Discrete means all components like resistors,capacitors,and transistors are created and connected on a chip,a piece of semiconductor material.

What is the most popular circuit model that is used to analyze how a transistor behaves when an ac signal is present?

Which statement is true with regard to the circuit shown in Figure 8-4?

Voltage gain is ac output voltage divided by the ac input voltage.

Amplified ripple out of a loudspeaker is detected as

In the circuit shown in Figure 8-30,if the collector voltage is 0 V and the base voltage is 0 V,what is the trouble?

One way to reduce distortion in a transistor amplifier is to keep the base ac input voltage small.

What is one way to minimize distortion?

The ac current gain equals the ac collector current divided by the ac base current.

The ac equivalent circuit model called the Ebers-Moll looks like a P on its side and is sometimes called a P model.

What makes the p model,an equivalent transistor circuit model,easier to use than other models?

In order for a bypass capacitor to work properly,its reactance must be

The circuit shown in Figure 8-30 has an ac emitter voltage of 0.75 mV and an ac collector voltage of 5 mV.What is the trouble?

In the circuit shown in Figure 8-30,if the ac collector voltage is 2 mV and the dc collector voltage is 6 V,what is the trouble?

In the circuit shown in Figure 8-8,if an ac voltage was measured between the emitter and ground

The ac output voltage of an amplifier divided by the ac input voltage is referred to as the amplifier's

The voltage gain equals the ac collector resistance divided by the ac resistance of the collector diode.

The reactance of a coupling capacitor at dc voltage is ________.

When a single or double stage amplifier is not working,troubleshooting can begin by measuring dc voltages.

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