Question 1

Why is midpoint bias desirable for most linear amplifiers?

Accepted Answer

A)  It extends the operating life of the transistor. 
B)  It allows optimum ac operation of the circuit. 
C)  It allows optimum dc operation of the circuit. 
D)  It keeps VCEQ at approximately half the value of VCC. 
A)  It extends the operating life of the transistor. 
B)  It allows optimum ac operation of the circuit. 
C)  It allows optimum dc operation of the circuit. 
D)  It keeps VCEQ at approximately half the value of VCC. B

Question 2

As temperature increases, the value of hFE

Accepted Answer

A)  increases. 
B)  decreases. 
A)  increases. 
B)  decreases. A

Question 3

An emitter bias circuit has values of VCC = +8 V and VEE = -8 V. The value of VCEoff) for the circuit is

Accepted Answer

A)  4 V. 
B)  8 V. 
C)  16 V. 
D)  0.7 V. 
A)  4 V. 
B)  8 V. 
C)  16 V. 
D)  0.7 V. C

Question 4

The simplest transistor biasing circuit is called

Accepted Answer

A)  voltage-divider bias. 
B)  emitter-feedback bias. 
C)  base bias. 
D)  collector-feedback bias. 
A)  voltage-divider bias. 
B)  emitter-feedback bias. 
C)  base bias. 
D)  collector-feedback bias.

Question 5

-The value of Rbase for the circuit is

Accepted Answer

A)  1.1 k Ω. 
B)  88 k Ω. 
C)  8.97 k Ω. 
A)  1.1 k Ω. 
B)  88 k Ω. 
C)  8.97 k Ω.

Question 6

What type of bias is used primarily in switching circuits?

Accepted Answer

A)  Base bias 
B)  Emitter bias 
C)  Voltage-divider bias 
D)  Collector-feedback bias 
A)  Base bias 
B)  Emitter bias 
C)  Voltage-divider bias 
D)  Collector-feedback bias

Question 7

-Is the circuit in Figure midpoint biased?

Accepted Answer

A)  Yes 
B)  No 
A)  Yes 
B)  No

Question 8

The term quiescent means

Accepted Answer

A)  midpoint biased. 
B)  at rest. 
C)  active. 
D)  Both A and B above. 
A)  midpoint biased. 
B)  at rest. 
C)  active. 
D)  Both A and B above.

Question 9

-The circuit in Figure found to be in saturation. Which of the following could cause this condition?

Accepted Answer

A)  A open base resistor RB 
B)  An open collector resistor RC 
C)  An open transistor Q1 base-to-emitter 
D)  A shorted base resistor RB  
A)  A open base resistor RB 
B)  An open collector resistor RC 
C)  An open transistor Q1 base-to-emitter 
D)  A shorted base resistor RB

Question 10

Which of the following is a characteristic of emitter bias ?

Accepted Answer

A)  The emitter potential is very low, typically less than -1 V. 
B)  The base potential is very close to 0 V. 
C)  The collector potential is approximately equal to VCC. 
D)  All of the above are characteristic of emitter bias. 
E)  Both A and B are characteristic of emitter bias. 
A)  The emitter potential is very low, typically less than -1 V. 
B)  The base potential is very close to 0 V. 
C)  The collector potential is approximately equal to VCC. 
D)  All of the above are characteristic of emitter bias. 
E)  Both A and B are characteristic of emitter bias.

Question 11

-Refer to Figure  The circuit is an) .

Accepted Answer

A)  base bias 
B)  emitter bias 
C)  voltage-divider bias 
D)  collector feedback 
E)  emitter-feedback 
A)  base bias 
B)  emitter bias 
C)  voltage-divider bias 
D)  collector feedback 
E)  emitter-feedback

Question 12

-The value of VCEoff) for the circuit in Figure  is

Accepted Answer

A)  10 V. 
B)  20 V. 
C)  5 V. 
D)  0 V. 
A)  10 V. 
B)  20 V. 
C)  5 V. 
D)  0 V.

Question 13

-Is the circuit in Figure midpoint biased?

Accepted Answer

A)  Yes 
B)  No 
A)  Yes 
B)  No

Question 14

What type of bias requires the use of a dual-polarity power supply?

Accepted Answer

A)  Base bias 
B)  Emitter bias 
C)  Voltage-divider bias 
D)  Collector-feedback bias
Chapter 7 DC Biasing Circuits Answer Key 
A)  Base bias 
B)  Emitter bias 
C)  Voltage-divider bias 
D)  Collector-feedback bias
Chapter 7 DC Biasing Circuits Answer Key

Question 15

Base bias is used primarily in switching applications.

Accepted Answer

A) True 
 B)False

Question 16

The spec sheet for a given transistor contains the following table: hFE = 5 to 200 when IC = 1 mA hFE = 70 to 350 when IC = 10 mA hFE = 100 to 400 when IC = 20 mA hFE = 150 to 450 when IC = 100 mA
The transistor is being used in a circuit with the following values: VCC = 20 V, RC = 820 Ω, and RE = 180 Ω. What value of hFE should be used in the analysis of the circuit?

Accepted Answer

A)  100 
B)  157 
C)  200 
D)  None of these are correct. 
A)  100 
B)  157 
C)  200 
D)  None of these are correct.

Question 17

-The circuit has measured values of VB = 2.2 V, VE = 1.5 V and VC = 11.5 V. Which of the following could account for these readings?

Accepted Answer

A)  The 68 kΩ resistor is open. 
B)  The 10 kΩ resistor is open. 
C)  The 6.2 kΩ resistor is open. 
D)  The 1.1 kΩ resistor is open. 
E)  There is no fault. The circuit is functioning as it should. 
A)  The 68 kΩ resistor is open. 
B)  The 10 kΩ resistor is open. 
C)  The 6.2 kΩ resistor is open. 
D)  The 1.1 kΩ resistor is open. 
E)  There is no fault. The circuit is functioning as it should.

Question 18

-Refer to Figure 7-5. The circuit has measured values of VB = 0 V, VE = 0 V, and VC = 20 V. Which of the following could account for these readings?

Accepted Answer

A)  The 68 kΩ resistor is open. 
B)  The 10 kΩ resistor is open. 
C)  The 6.2 kΩ resistor is open. 
D)  The 1.1 kΩ resistor is open. 
E)  There is no fault. The circuit is functioning as it should. 
A)  The 68 kΩ resistor is open. 
B)  The 10 kΩ resistor is open. 
C)  The 6.2 kΩ resistor is open. 
D)  The 1.1 kΩ resistor is open. 
E)  There is no fault. The circuit is functioning as it should.

Question 19

-The value of ICsat) for the circuit in Figure is

Accepted Answer

A)  21.3 mA. 
B)  14.1 mA. 
C)  7.04 mA. 
D)  0 mA. 
A)  21.3 mA. 
B)  14.1 mA. 
C)  7.04 mA. 
D)  0 mA.

Question 20

A transistor has a rating of hFE = 50 to 450. What value of hFE should be used for circuit analysis purposes?

Accepted Answer

A)  50 
B)  250 
C)  450 
D)  150 
A)  50 
B)  250 
C)  450 
D)  150

Why is midpoint bias desirable for most linear amplifiers?

As temperature increases, the value of hFE

An emitter bias circuit has values of VCC = +8 V and VEE = -8 V. The value of VCEoff) for the circuit is

The simplest transistor biasing circuit is called

-The value of Rbase for the circuit is

What type of bias is used primarily in switching circuits?

-Is the circuit in Figure midpoint biased?

The term quiescent means

-The circuit in Figure found to be in saturation. Which of the following could cause this condition?

Which of the following is a characteristic of emitter bias ?

-Refer to Figure The circuit is an) .

-The value of VCEoff) for the circuit in Figure is

-Is the circuit in Figure midpoint biased?

What type of bias requires the use of a dual-polarity power supply?

Base bias is used primarily in switching applications.

-The circuit has measured values of VB = 2.2 V, VE = 1.5 V and VC = 11.5 V. Which of the following could account for these readings?

-Refer to Figure 7-5. The circuit has measured values of VB = 0 V, VE = 0 V, and VC = 20 V. Which of the following could account for these readings?

-The value of ICsat) for the circuit in Figure is

A transistor has a rating of hFE = 50 to 450. What value of hFE should be used for circuit analysis purposes?

Fundamental Solid-State Principles

Diodes

Common Diode Applications: Basic Power Supply Circuits

Common Diode Applications: Clippers, Clampers, Voltage Multipliers, and Displays

Special Applications Diodes

Bipolar Junction Transistors

Introduction to Amplifiers

Common-Emitter Amplifiers

Other BJT Amplifiers

Power Amplifiers

Field-Effect Transistors

Mosfets

Amplifier Frequency Response

Operational Amplifiers

Additional Op-Amp Applications

Tuned Amplifiers

Oscillators

Solid-State Switching Circuits

Thyristors and Optoelectronics Devices

Discrete and Integrated Voltage Regulators

Filters

Exam 7: DC Biasing Circuits

Why is midpoint bias desirable for most linear amplifiers?

As temperature increases, the value of hFE

An emitter bias circuit has values of VCC = +8 V and VEE = -8 V. The value of VCEoff) for the circuit is

The simplest transistor biasing circuit is called

-The value of Rbase for the circuit is

What type of bias is used primarily in switching circuits?

-Is the circuit in Figure midpoint biased?

The term quiescent means

-The circuit in Figure found to be in saturation. Which of the following could cause this condition?

Which of the following is a characteristic of emitter bias ?

-Refer to Figure The circuit is an) .

-The value of VCEoff) for the circuit in Figure is

-Is the circuit in Figure midpoint biased?

What type of bias requires the use of a dual-polarity power supply?

Base bias is used primarily in switching applications.

-The circuit has measured values of VB = 2.2 V, VE = 1.5 V and VC = 11.5 V. Which of the following could account for these readings?

-Refer to Figure 7-5. The circuit has measured values of VB = 0 V, VE = 0 V, and VC = 20 V. Which of the following could account for these readings?

-The value of ICsat) for the circuit in Figure is

A transistor has a rating of hFE = 50 to 450. What value of hFE should be used for circuit analysis purposes?

Fundamental Solid-State Principles

Diodes

Common Diode Applications: Basic Power Supply Circuits

Common Diode Applications: Clippers, Clampers, Voltage Multipliers, and Displays

Special Applications Diodes

Bipolar Junction Transistors

Introduction to Amplifiers

Common-Emitter Amplifiers

Other BJT Amplifiers

Power Amplifiers

Field-Effect Transistors

Mosfets

Amplifier Frequency Response

Operational Amplifiers

Additional Op-Amp Applications

Tuned Amplifiers

Oscillators

Solid-State Switching Circuits

Thyristors and Optoelectronics Devices

Discrete and Integrated Voltage Regulators

Filters