Question 1

-C3 in Figure  is used to

Accepted Answer

A)  increase the voltage gain of the circuit. 
B)  increase the current gain of the circuit. 
C)  couple VCC to ground. 
D)  prevent unwanted variations in VCC. 
A)  increase the voltage gain of the circuit. 
B)  increase the current gain of the circuit. 
C)  couple VCC to ground. 
D)  prevent unwanted variations in VCC. D

Question 2

-The circuit values of ICsat) and VCEoff) are .

Accepted Answer

A)  2.5 mA and 20 V 
B)  2.5 mA and 10 V 
C)  5 mA and 20 V 
D)  10 mA and 20 V 
A)  2.5 mA and 20 V 
B)  2.5 mA and 10 V 
C)  5 mA and 20 V 
D)  10 mA and 20 V D

Question 3

-The circuit in Figure  has the following values: R1 = 60 kΩ, R2 = 20 kΩ, RC = 3.3 kΩ, RL = 10 kΩ, RE = 1.5 kΩ and VCC = 9 V.
The values for ICsat) and VCEoff) for the circuit are

Accepted Answer

A)  1.1 mA and 9 V. 
B)  1.9 mA and 9 V. 
C)  1.9 mA and 4.5 V. 
D)  1.1 mA and 4.5 V. 
A)  1.1 mA and 9 V. 
B)  1.9 mA and 9 V. 
C)  1.9 mA and 4.5 V. 
D)  1.1 mA and 4.5 V. B

Question 4

-The value of Av for the circuit in Figure  is

Accepted Answer

A)  0.988. 
B)  0.990. 
C)  0.998. 
D)  None of these are correct. 
A)  0.988. 
B)  0.990. 
C)  0.998. 
D)  None of these are correct.

Question 5

-The circuit in Figure  has the following values: R1 = 60 kΩ, R2 = 20 kΩ, RE = 1.5 kΩ,RC = 3.3 kΩ, and RL = 10 kΩ, and VCC = 9 V.
What is the circuit value of Av?

Accepted Answer

A)  About 1 
B)  0.984 
C)  102 
D)  132 
A)  About 1 
B)  0.984 
C)  102 
D)  132

Question 6

-An engineer is designing a P.A. system. He intends to use a 300 Ω microphone and 8 Ω speakers. What values of Zin and Zout should this P.A. system amplifier have?

Accepted Answer

A)  Zin = 8 Ω, Zout = 300 Ω 
B)  Zin = 300 Ω, Zout = 8 Ω 
C)  Zin much greater than 8 Ω and Zout much lower that 300 Ω 
D)  Zin much lower than 300 Ω and Zout much greater than 8 Ω 
A)  Zin = 8 Ω, Zout = 300 Ω 
B)  Zin = 300 Ω, Zout = 8 Ω 
C)  Zin much greater than 8 Ω and Zout much lower that 300 Ω 
D)  Zin much lower than 300 Ω and Zout much greater than 8 Ω

Question 7

Which biasing circuits are commonly used in common-base amplifiers?

Accepted Answer

A)  Voltage-divider bias and base bias 
B)  Base bias and emitter bias 
C)  Emitter bias and voltage-divider bias 
D)  Collector feedback and emitter follower bias 
A)  Voltage-divider bias and base bias 
B)  Base bias and emitter bias 
C)  Emitter bias and voltage-divider bias 
D)  Collector feedback and emitter follower bias

Question 8

Refer to Figure 10-1. The circuit values of ICsat) and VCEoff) are .

Accepted Answer

A)  2.273 and 5 V 
B)  2.273 mA and 5 V 
C)  2.73 mA and 2.5 V 
D)  cannot be determined since RC is a short. 
A)  2.273 and 5 V 
B)  2.273 mA and 5 V 
C)  2.73 mA and 2.5 V 
D)  cannot be determined since RC is a short.

Question 9

-The source and load in Figure exhibit:

Accepted Answer

A)  matched impedance. 
B)  saturated source impedance. 
C)  mismatched impedance. 
D)  over loaded current gain. 
A)  matched impedance. 
B)  saturated source impedance. 
C)  mismatched impedance. 
D)  over loaded current gain.

Question 10

What is the value of ICsat) for the circuit in Figure?

Accepted Answer

A)  1.14 mA 
B)  3.41 mA 
C)  2.27 mA 
D)  Cannot be determined with the information given. 
A)  1.14 mA 
B)  3.41 mA 
C)  2.27 mA 
D)  Cannot be determined with the information given.

Question 11

-The circuit in Figure is a amplifier.

Accepted Answer

A)  CE 
B)  CC 
C)  CB 
D)  VBB 
A)  CE 
B)  CC 
C)  CB 
D)  VBB

Question 12

-The circuit in Figure is

Accepted Answer

A)  voltage divider biased. 
B)  emitter biased. 
C)  common collector biased. 
D)  drawn incorrectly. The input should be applied to the base. 
A)  voltage divider biased. 
B)  emitter biased. 
C)  common collector biased. 
D)  drawn incorrectly. The input should be applied to the base.

Question 13

-Which best describes an emitter follower?

Accepted Answer

A)  The emitter follower is a voltage amplifier with a voltage gain that equals 1. 
B)  The emitter follower is a current amplifier with a voltage gain that equals 1. 
C)  The emitter follower is a power amplifier with a power gain that equals 1. 
D)  The emitter follower is a current amplifier with a voltage gain that is less than 1. 
A)  The emitter follower is a voltage amplifier with a voltage gain that equals 1. 
B)  The emitter follower is a current amplifier with a voltage gain that equals 1. 
C)  The emitter follower is a power amplifier with a power gain that equals 1. 
D)  The emitter follower is a current amplifier with a voltage gain that is less than 1.

Question 14

Which of the following statements about emitter followers is true?

Accepted Answer

A)  The value of Av is greater than the value of Ai. 
B)  The value of Ai is greater than the value of Ap. 
C)  The value of Av is greater than the value of Ap. 
D)  The values for Av and Ap are approximately equal under normal circumstances. 
A)  The value of Av is greater than the value of Ai. 
B)  The value of Ai is greater than the value of Ap. 
C)  The value of Av is greater than the value of Ap. 
D)  The values for Av and Ap are approximately equal under normal circumstances.

Question 15

Which of the following statements is true?

Accepted Answer

A)  Darlington emitter-followers provide extremely high values of Av. 
B)  An emitter follower containing a single transistor has lower output impedance than an identical circuit containing a Darlington pair. 
C)  The Darlington emitter follower has extremely low input impedance. 
D)  Darlington emitter followers have high input impedance and low output impedance. 
A)  Darlington emitter-followers provide extremely high values of Av. 
B)  An emitter follower containing a single transistor has lower output impedance than an identical circuit containing a Darlington pair. 
C)  The Darlington emitter follower has extremely low input impedance. 
D)  Darlington emitter followers have high input impedance and low output impedance.

Question 16

-Which amplifier configurations produce no voltage phase shift from input to output?

Accepted Answer

A)  CC and CE 
B)  CB and CE 
C)  CB, CC, and CE 
D)  CC and CB 
A)  CC and CE 
B)  CB and CE 
C)  CB, CC, and CE 
D)  CC and CB

Question 17

Emitter followers can be used to match a resistance source to a resistance load.

Accepted Answer

A)  high; high 
B)  low; high 
C)  high; low 
D)  low; low 
A)  high; high 
B)  low; high 
C)  high; low 
D)  low; low

Question 18

Replacing a standard transistor with a Darlington pair in an emitter follower will cause the value of Ap for the circuit to

Accepted Answer

A)  increase. 
B)  decrease. 
C)  remain the same. 
A)  increase. 
B)  decrease. 
C)  remain the same.

Question 19

A common-base amplifier has values of rʹe = 15 Ω and RE = 3 kΩ. What is the approximate input impedance of the circuit?

Accepted Answer

A)  3 kΩ 
B)  3015 Ω 
C)  15 Ω 
D)  200 Ω 
A)  3 kΩ 
B)  3015 Ω 
C)  15 Ω 
D)  200 Ω

Question 20

-Which of the following would be used to properly couple the source to the load?

Accepted Answer

A)  A common base amplifier with Zin = 150 kΩ and Zout = 20 Ω 
B)  A common base amplifier with Zin = 20 Ω and Zout = 150 kΩ 
C)  A common collector amplifier with Zin = 150 kΩ and Zout = 20 Ω 
D)  A common collector amplifier with Zin = 20 Ω and Zout = 150 Ω 
E)  A direct connection between the source and load 
A)  A common base amplifier with Zin = 150 kΩ and Zout = 20 Ω 
B)  A common base amplifier with Zin = 20 Ω and Zout = 150 kΩ 
C)  A common collector amplifier with Zin = 150 kΩ and Zout = 20 Ω 
D)  A common collector amplifier with Zin = 20 Ω and Zout = 150 Ω 
E)  A direct connection between the source and load

Exam 10: Other BJT Amplifiers

-C3 in Figure is used to

-The circuit values of ICsat) and VCEoff) are .

-The circuit in Figure has the following values: R1 = 60 kΩ, R2 = 20 kΩ, RC = 3.3 kΩ, RL = 10 kΩ, RE = 1.5 kΩ and VCC = 9 V. The values for ICsat) and VCEoff) for the circuit are

-The value of Av for the circuit in Figure is

-The circuit in Figure has the following values: R1 = 60 kΩ, R2 = 20 kΩ, RE = 1.5 kΩ,RC = 3.3 kΩ, and RL = 10 kΩ, and VCC = 9 V. What is the circuit value of Av?

-An engineer is designing a P.A. system. He intends to use a 300 Ω microphone and 8 Ω speakers. What values of Zin and Zout should this P.A. system amplifier have?

Which biasing circuits are commonly used in common-base amplifiers?

Refer to Figure 10-1. The circuit values of ICsat) and VCEoff) are .

-The source and load in Figure exhibit:

What is the value of ICsat) for the circuit in Figure?

-The circuit in Figure is a amplifier.

-The circuit in Figure is

-Which best describes an emitter follower?

Which of the following statements about emitter followers is true?

Which of the following statements is true?

-Which amplifier configurations produce no voltage phase shift from input to output?

Emitter followers can be used to match a resistance source to a resistance load.

Replacing a standard transistor with a Darlington pair in an emitter follower will cause the value of Ap for the circuit to

A common-base amplifier has values of rʹe = 15 Ω and RE = 3 kΩ. What is the approximate input impedance of the circuit?

-Which of the following would be used to properly couple the source to the load?

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

DC Biasing Circuits

Introduction to Amplifiers

Common-Emitter 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

-C₃ in Figure is used to