Question 1

Figure 3
-Refer to Figure 3. The value of dc bias current in R1 is

Accepted Answer

A) 43 mA 
B) 90 mA 
C) 86 mA 
D) 48 mA 
A) 43 mA 
B) 90 mA 
C) 86 mA 
D) 48 mA A

Question 2

Figure 4
-Refer to Figure 4. The amplifier represented is

Accepted Answer

A) class- C 
B) class- A 
C) class- B 
A) class- C 
B) class- A 
C) class- B C

Question 3

The amplifier type that frequently has a resonant circuit load is

Accepted Answer

A) class- AB 
B) class- C 
C) class- B 
D) class- A 
A) class- AB 
B) class- C 
C) class- B 
D) class- A B

Question 4

Figure 5
-Refer to Figure 5. The center tap on the output transformer (markedA)should be connected to

Accepted Answer

A) -VCC 
B) ground 
C) +VCC  
D) nothing, it is left open 
A) -VCC 
B) ground 
C) +VCC  
D) nothing, it is left open

Question 5

Figure 3
-Refer to Figure 3. Note the input is a 5 Vrms sine wave. The ac power in RL is ideally

Accepted Answer

A) 1.56 W 
B) 3.12 W 
C) 0.31 W 
D) 0.62 W 
A) 1.56 W 
B) 3.12 W 
C) 0.31 W 
D) 0.62 W

Question 6

The ratio of Pout to PDC is the efficiency of an amplifier.

Accepted Answer

A) True 
 B)False

Question 7

The maximum ideal efficiency for a class- A amplifier is

Accepted Answer

A) 80% 
B) 40% 
C) 55% 
D) 25% 
A) 80% 
B) 40% 
C) 55% 
D) 25%

Question 8

Figure 6
-Refer to Figure 6. The combination of R1, C1, and the base- emitter diode form a

Accepted Answer

A) positive clipping circuit 
B) clamping circuit 
C) negative clipping circuit 
D) coupling circuit 
A) positive clipping circuit 
B) clamping circuit 
C) negative clipping circuit 
D) coupling circuit

Question 9

Assume the Q point on a class- A amplifier is centered on the ac load line. The maximum peak- to- peak output voltage is

Accepted Answer

A) 1/2 VCEQ 
B) 2 VCEQ 
C) 1/2 VCC 
D) VCEQ 
A) 1/2 VCEQ 
B) 2 VCEQ 
C) 1/2 VCC 
D) VCEQ

Question 10

A heat sink is used to

Accepted Answer

A) prevent excessive current 
B) reduce the junction temperature 
C) reduce ambient temperature 
D) all of the above 
A) prevent excessive current 
B) reduce the junction temperature 
C) reduce ambient temperature 
D) all of the above

Question 11

A class- B amplifier with Darlington transistors can use larger bias resistors.

Accepted Answer

A) True 
 B)False

Question 12

Figure 5
-Refer to Figure 5. The diode

Accepted Answer

A) produces class- AB operation 
B) compensates for the base- emitter drops of the transistors 
C) helps prevent crossover distortion 
D) all of the above 
A) produces class- AB operation 
B) compensates for the base- emitter drops of the transistors 
C) helps prevent crossover distortion 
D) all of the above

Question 13

Figure 7
-Refer to Figure 7. The expected ac emitter voltage for Q1 is

Accepted Answer

A) 4.0 Vrms 
B) 2.0 Vrms 
C) 0 V 
D) none of the above 
A) 4.0 Vrms 
B) 2.0 Vrms 
C) 0 V 
D) none of the above

Question 14

Figure 1
-Refer to Figure 1. The voltage gain, Av, to the load is approximately

Accepted Answer

A) 11 
B) 7.5 
C) 5.4 
D) 2.0 
A) 11 
B) 7.5 
C) 5.4 
D) 2.0

Question 15

Figure 6
-The transistor in a Class- C amplifier is biased for conduction for

Accepted Answer

A) 360° 
B) 90° 
C) 180° 
D) much less than 90° 
A) 360° 
B) 90° 
C) 180° 
D) much less than 90°

Question 16

Figure 2 This is modification of Figure 1 (added QS1U1B12S1U1B0, QS1U1B13S1U1B0, and RS1U1B1LS1U1B0, deletion of CS1U1B13 S1U1B0and a changed value of RS1U1B1E1S1U1B0).
-Refer to Figure 2. If Vin = 1 Vrms, the ac power in RL is approximately

Accepted Answer

A) 2.6 W 
B) 4.0 W 
C) 680 mW 
D) 1.3 W 
A) 2.6 W 
B) 4.0 W 
C) 680 mW 
D) 1.3 W

Question 17

A class- A amplifier has an input resistance of 520 ▲ and a load resistance of 26 ▲. Assume a 1 Vrms input produces a 5 Vrms output The power gain is

Accepted Answer

A) 5 
B) 100 
C) 50 
D) 500 
A) 5 
B) 100 
C) 50 
D) 500

Question 18

A class- A amplifier the quiescent power is dissipated only when a signal is present.

Accepted Answer

A) True 
 B)False

Question 19

Figure 2 This is modification of Figure 1 (added QS1U1B12S1U1B0, QS1U1B13S1U1B0, and RS1U1B1LS1U1B0, deletion of CS1U1B13 S1U1B0and a changed value of RS1U1B1E1S1U1B0).
-Refer to Figure 2. With no applied signal, the dc power dissipated in the load is approximately

Accepted Answer

A) 1.1 W 
B) 0 
C) 5.5 W 
D) 2.8 W 
A) 1.1 W 
B) 0 
C) 5.5 W 
D) 2.8 W

Question 20

Figure 3
-Refer to Figure 3. This type of bias is called

Accepted Answer

A) current- mirror biasing 
B) push- pull bias 
C) diode biasing 
D) mid- point bias 
A) current- mirror biasing 
B) push- pull bias 
C) diode biasing 
D) mid- point bias

Figure 3 -Refer to Figure 3. The value of dc bias current in R1 is

Figure 4 -Refer to Figure 4. The amplifier represented is

The amplifier type that frequently has a resonant circuit load is

Figure 5 -Refer to Figure 5. The center tap on the output transformer (markedA)should be connected to

Figure 3 -Refer to Figure 3. Note the input is a 5 Vrms sine wave. The ac power in RL is ideally

The ratio of Pout to PDC is the efficiency of an amplifier.

The maximum ideal efficiency for a class- A amplifier is

Figure 6 -Refer to Figure 6. The combination of R1, C1, and the base- emitter diode form a

Assume the Q point on a class- A amplifier is centered on the ac load line. The maximum peak- to- peak output voltage is

A heat sink is used to

A class- B amplifier with Darlington transistors can use larger bias resistors.

Figure 5 -Refer to Figure 5. The diode

Figure 7 -Refer to Figure 7. The expected ac emitter voltage for Q1 is

Figure 1 -Refer to Figure 1. The voltage gain, Av, to the load is approximately

Figure 6 -The transistor in a Class- C amplifier is biased for conduction for

Figure 2 This is modification of Figure 1 (added Q₂, Q₃, and R_L, deletion of C₃and a changed value of R_E1). -Refer to Figure 2. If Vin = 1 Vrms, the ac power in RL is approximately

A class- A amplifier has an input resistance of 520 ▲ and a load resistance of 26 ▲. Assume a 1 Vrms input produces a 5 Vrms output The power gain is

A class- A amplifier the quiescent power is dissipated only when a signal is present.

Figure 2 This is modification of Figure 1 (added Q₂, Q₃, and R_L, deletion of C₃and a changed value of R_E1). -Refer to Figure 2. With no applied signal, the dc power dissipated in the load is approximately

Figure 3 -Refer to Figure 3. This type of bias is called

Introduction to Semiconductors

Diodes and Applications

Special-Purpose Diodes

Bipolar Junction Transistors

Transistor Bias Circuits

BJT Amplifiers

Field-Effect Transistors Fets

Fet Amplifiers and Switching Circuits

Amplifier Frequency Response

Thyristors

The Operational Amplifier

Basic Op-Amp Circuits

Special-Purpose Integrated Circuits

Active Filters

Oscillators

Voltage Regulators

Communication Devices and Methods

Filters

Exam 7: BJT Power Amplifiers

Figure 3 -Refer to Figure 3. The value of dc bias current in R1 is

Figure 4 -Refer to Figure 4. The amplifier represented is

The amplifier type that frequently has a resonant circuit load is

Figure 5 -Refer to Figure 5. The center tap on the output transformer (markedA)should be connected to

Figure 3 -Refer to Figure 3. Note the input is a 5 Vrms sine wave. The ac power in RL is ideally

The ratio of Pout to PDC is the efficiency of an amplifier.

The maximum ideal efficiency for a class- A amplifier is

Figure 6 -Refer to Figure 6. The combination of R1, C1, and the base- emitter diode form a

Assume the Q point on a class- A amplifier is centered on the ac load line. The maximum peak- to- peak output voltage is

A heat sink is used to

A class- B amplifier with Darlington transistors can use larger bias resistors.

Figure 5 -Refer to Figure 5. The diode

Figure 7 -Refer to Figure 7. The expected ac emitter voltage for Q1 is

Figure 1 -Refer to Figure 1. The voltage gain, Av, to the load is approximately

Figure 6 -The transistor in a Class- C amplifier is biased for conduction for

Figure 2 This is modification of Figure 1 (added Q2, Q3, and RL, deletion of C3 and a changed value of RE1). -Refer to Figure 2. If Vin = 1 Vrms, the ac power in RL is approximately

A class- A amplifier has an input resistance of 520 ▲ and a load resistance of 26 ▲. Assume a 1 Vrms input produces a 5 Vrms output The power gain is

A class- A amplifier the quiescent power is dissipated only when a signal is present.

Figure 2 This is modification of Figure 1 (added Q2, Q3, and RL, deletion of C3 and a changed value of RE1). -Refer to Figure 2. With no applied signal, the dc power dissipated in the load is approximately

Figure 3 -Refer to Figure 3. This type of bias is called

Introduction to Semiconductors

Diodes and Applications

Special-Purpose Diodes

Bipolar Junction Transistors

Transistor Bias Circuits

BJT Amplifiers

Field-Effect Transistors Fets

Fet Amplifiers and Switching Circuits

Amplifier Frequency Response

Thyristors

The Operational Amplifier

Basic Op-Amp Circuits

Special-Purpose Integrated Circuits

Active Filters

Oscillators

Voltage Regulators

Communication Devices and Methods

Filters

Figure 2 This is modification of Figure 1 (added Q₂, Q₃, and R_L, deletion of C₃and a changed value of R_E1). -Refer to Figure 2. If Vin = 1 Vrms, the ac power in RL is approximately

Figure 2 This is modification of Figure 1 (added Q₂, Q₃, and R_L, deletion of C₃and a changed value of R_E1). -Refer to Figure 2. With no applied signal, the dc power dissipated in the load is approximately