Question 1

Heat sink compound may be used to provide both a thermal connection and a mechanical connection.

Accepted Answer

A) True 
 B)False

Question 2

Complementary-symmetry amplifiers are generally preferred over standard push-pull amplifiers because

Accepted Answer

A)  they use complementary transistors. 
B)  they do not require the use of an output transformer. 
C)  they have high efficiency ratings. 
D)  they can drive lower impedance loads. 
A)  they use complementary transistors. 
B)  they do not require the use of an output transformer. 
C)  they have high efficiency ratings. 
D)  they can drive lower impedance loads.

Question 3

Class B amplifiers usually contain

Accepted Answer

A)  two transistors. 
B)  an LC tank circuit in the BJT collector circuit. 
C)  a single BJT that conducts through 360° of the ac input cycle. 
D)  a single BJT that conducts through 270° of the ac input cycle. 
A)  two transistors. 
B)  an LC tank circuit in the BJT collector circuit. 
C)  a single BJT that conducts through 360° of the ac input cycle. 
D)  a single BJT that conducts through 270° of the ac input cycle.

Question 4

-The circuit in Figure has the following values: VCC = 12 V, R1 = 48 kΩ, R2 = 15 kΩ, RC = 4.7 kΩ, RE = 2.2 kΩ, RL = 12 kΩ, and hfe = hFE = 200 What is the approximate value of power dissipation for the transistor?

Accepted Answer

A)  5.1 mW 
B)  7.4 mW 
C)  12 mW 
D)  Cannot be determined without input signal 
A)  5.1 mW 
B)  7.4 mW 
C)  12 mW 
D)  Cannot be determined without input signal

Question 5

-The circuit in Figure  has the following values: VCC = 12 V, R1 = 48 kΩ, R2 = 15 kΩ, RC = 4.7 kΩ, RE = 2.2 kΩ, RL = 12 kΩ, and hfe = hFE = 200.
What is the compliance of this circuit?

Accepted Answer

A)  6.6 V 
B)  10.5 V 
C)  12 V 
D)  It cannot be determined with the information given. 
A)  6.6 V 
B)  10.5 V 
C)  12 V 
D)  It cannot be determined with the information given.

Question 6

-The circuit in Figure  has the following values: VCC = 12 V, R1 = 48 kΩ, R2 = 15 kΩ, RC = 4.7 kΩ, RE = 2.2 kΩ, RL = 12 kΩ, and hfe = hFE = 200 How much power is the circuit drawing from the dc power source?

Accepted Answer

A)  2.3 mW 
B)  11.7 mW 
C)  14.1 mW 
D)  457 μW 
A)  2.3 mW 
B)  11.7 mW 
C)  14.1 mW 
D)  457 μW

Question 7

A class A amplifier has an 8 Vpp output that is being applied to a 200 Ω load. What is the total ac load power?

Accepted Answer

A)  320 mW 
B)  640 mW 
C)  40 mW 
D)  80 mW 
A)  320 mW 
B)  640 mW 
C)  40 mW 
D)  80 mW

Question 8

A transformer-coupled class A amplifier with a transformer turns ratio of 4:1 and a value of RL = 25 Ω draws 220 mW from its dc power supply. What is the efficiency of the circuit?

Accepted Answer

A)  20.5% 
B)  27.3% 
C)  40.9% 
D)  73% 
A)  20.5% 
B)  27.3% 
C)  40.9% 
D)  73%

Question 9

The transformer-coupled class A amplifier has the lowest efficiency rating of all the class A amplifiers.

Accepted Answer

A) True 
 B)False

Question 10

An amplifier has values of 2ICQrC = 4.44 V and 2VCEQ = 7 V. If the ac output voltage exceeds 7 V, the amplifier will experience

Accepted Answer

A)  saturation clipping. 
B)  cutoff clipping. 
C)  both saturation and cutoff clipping. 
D)  none of the above. 
A)  saturation clipping. 
B)  cutoff clipping. 
C)  both saturation and cutoff clipping. 
D)  none of the above.

Question 11

A class AB amplifier has values of VCC = 12 V and RL = 150 Ω. What is the maximum theoretical ac load power for the circuit?

Accepted Answer

A)  120 mW 
B)  240 mW 
C)  960 mW 
D)  Cannot be determined from the information given. 
A)  120 mW 
B)  240 mW 
C)  960 mW 
D)  Cannot be determined from the information given.

Heat sink compound may be used to provide both a thermal connection and a mechanical connection.

Complementary-symmetry amplifiers are generally preferred over standard push-pull amplifiers because

Class B amplifiers usually contain

-The circuit in Figure has the following values: VCC = 12 V, R1 = 48 kΩ, R2 = 15 kΩ, RC = 4.7 kΩ, RE = 2.2 kΩ, RL = 12 kΩ, and hfe = hFE = 200 What is the approximate value of power dissipation for the transistor?

-The circuit in Figure has the following values: VCC = 12 V, R1 = 48 kΩ, R2 = 15 kΩ, RC = 4.7 kΩ, RE = 2.2 kΩ, RL = 12 kΩ, and hfe = hFE = 200. What is the compliance of this circuit?

-The circuit in Figure has the following values: VCC = 12 V, R1 = 48 kΩ, R2 = 15 kΩ, RC = 4.7 kΩ, RE = 2.2 kΩ, RL = 12 kΩ, and hfe = hFE = 200 How much power is the circuit drawing from the dc power source?

A class A amplifier has an 8 Vpp output that is being applied to a 200 Ω load. What is the total ac load power?

A transformer-coupled class A amplifier with a transformer turns ratio of 4:1 and a value of RL = 25 Ω draws 220 mW from its dc power supply. What is the efficiency of the circuit?

The transformer-coupled class A amplifier has the lowest efficiency rating of all the class A amplifiers.

An amplifier has values of 2ICQrC = 4.44 V and 2VCEQ = 7 V. If the ac output voltage exceeds 7 V, the amplifier will experience

A class AB amplifier has values of VCC = 12 V and RL = 150 Ω. What is the maximum theoretical ac load power for the circuit?

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

Other BJT 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 11: Power Amplifiers

Heat sink compound may be used to provide both a thermal connection and a mechanical connection.

Complementary-symmetry amplifiers are generally preferred over standard push-pull amplifiers because

Class B amplifiers usually contain

-The circuit in Figure has the following values: VCC = 12 V, R1 = 48 kΩ, R2 = 15 kΩ, RC = 4.7 kΩ, RE = 2.2 kΩ, RL = 12 kΩ, and hfe = hFE = 200 What is the approximate value of power dissipation for the transistor?

-The circuit in Figure has the following values: VCC = 12 V, R1 = 48 kΩ, R2 = 15 kΩ, RC = 4.7 kΩ, RE = 2.2 kΩ, RL = 12 kΩ, and hfe = hFE = 200. What is the compliance of this circuit?

-The circuit in Figure has the following values: VCC = 12 V, R1 = 48 kΩ, R2 = 15 kΩ, RC = 4.7 kΩ, RE = 2.2 kΩ, RL = 12 kΩ, and hfe = hFE = 200 How much power is the circuit drawing from the dc power source?

A class A amplifier has an 8 Vpp output that is being applied to a 200 Ω load. What is the total ac load power?

A transformer-coupled class A amplifier with a transformer turns ratio of 4:1 and a value of RL = 25 Ω draws 220 mW from its dc power supply. What is the efficiency of the circuit?

The transformer-coupled class A amplifier has the lowest efficiency rating of all the class A amplifiers.

An amplifier has values of 2ICQrC = 4.44 V and 2VCEQ = 7 V. If the ac output voltage exceeds 7 V, the amplifier will experience

A class AB amplifier has values of VCC = 12 V and RL = 150 Ω. What is the maximum theoretical ac load power for the circuit?

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

Other BJT 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