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AMS 380 Unit 3 Questions and Correct
Answers/ Latest Update / Already Graded
3-30D1 What is the main advantage of using an op-amp audio filter
over a passive LC audio filter?
A. Op-amps are largely immune to vibration and temperature change.
B. Most LC filter manufacturers have retooled to make op-amp filters.
C. Op-amps are readily available in a wide variety of operational
voltages and frequency ranges.
D. Op-amps exhibit gain rather than insertion loss.
Ans: D
3-30D2 What are the characteristics of an inverting operational
amplifier (op-amp) circuit?
A. It has input and output signals in phase.
B. Input and output signals are 90 degrees out of phase.
C. It has input and output signals 180 degrees out of phase.
D. Input impedance is low while the output impedance is high.
Ans: C
3-30D3 Gain of a closed-loop op-amp circuit is determined by?
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A. The maximum operating frequency divided by the square root of
the load impedance.
B. The op-amp's external feedback network.
C. Supply voltage and slew rate.
D. The op-amp's internal feedback network.
Ans: B
3-30D4 Where is the external feedback network connected to control
the gain of a closed-loop op-amp circuit?
A. Between the differential inputs.
B. From output to the non-inverting input.
C. From output to the inverting input.
D. Between the output and the differential inputs.
Ans: C
3-30D5 Which of the following op-amp circuits is operated open-loop?
A. Non-inverting amp. C. Active filter.
B. Inverting amp. D. Comparator.
Ans: D
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3-30D6 In the op-amp oscillator circuit shown in Figure 3D6, what
would be the most noticeable effect if the capacitance of C were
suddenly doubled?
A. Frequency would be lower.
B. Frequency would be higher.
C. There would be no change. The inputs are reversed, therefore the
circuit cannot function.
D. None of the above.
Ans: A
3-32D1 Given the combined DC input voltages, what would the output
voltage be in the circuit shown in Figure 3D7?
A. 150 mV
B. 5.5 V
C. -15 mv
D. -5.5 V
Ans: D
3-32D2 Which lamps would be lit in the circuit shown in Figure 3D8?
A. 2, 3, 4, 5 and 6.
B. 5, 6, 8 and 9.
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C. 2, 3, 4, 7 and 8.
D. 1, 3, 5, 7 and 8.
Ans: C
3-32D3 What will occur if an amplifier input signal coupling capacitor
fails open?
A. No amplification will occur, with DC within the circuit measuring
normal.
B. Improper biasing will occur within the amplifier stage.
C. Oscillation and thermal runaway may occur.
D. An AC hum will appear on the circuit output.
Ans: A
3-32D4 In Figure 3D9, determine if there is a problem with this
regulated power supply and identify the problem.
A. R1 value is too low which would cause excessive base current and
instantly destroy TR 1.
B. D1 and D2 are reversed. The power supply simply would not
function.
C. TR1 is shown as an NPN and must be changed to a PNP.
D. There is no problem with the circuit.
All rights reserved © 2025/ 2026 |
AMS 380 Unit 3 Questions and Correct
Answers/ Latest Update / Already Graded
3-30D1 What is the main advantage of using an op-amp audio filter
over a passive LC audio filter?
A. Op-amps are largely immune to vibration and temperature change.
B. Most LC filter manufacturers have retooled to make op-amp filters.
C. Op-amps are readily available in a wide variety of operational
voltages and frequency ranges.
D. Op-amps exhibit gain rather than insertion loss.
Ans: D
3-30D2 What are the characteristics of an inverting operational
amplifier (op-amp) circuit?
A. It has input and output signals in phase.
B. Input and output signals are 90 degrees out of phase.
C. It has input and output signals 180 degrees out of phase.
D. Input impedance is low while the output impedance is high.
Ans: C
3-30D3 Gain of a closed-loop op-amp circuit is determined by?
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, Page |2
A. The maximum operating frequency divided by the square root of
the load impedance.
B. The op-amp's external feedback network.
C. Supply voltage and slew rate.
D. The op-amp's internal feedback network.
Ans: B
3-30D4 Where is the external feedback network connected to control
the gain of a closed-loop op-amp circuit?
A. Between the differential inputs.
B. From output to the non-inverting input.
C. From output to the inverting input.
D. Between the output and the differential inputs.
Ans: C
3-30D5 Which of the following op-amp circuits is operated open-loop?
A. Non-inverting amp. C. Active filter.
B. Inverting amp. D. Comparator.
Ans: D
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3-30D6 In the op-amp oscillator circuit shown in Figure 3D6, what
would be the most noticeable effect if the capacitance of C were
suddenly doubled?
A. Frequency would be lower.
B. Frequency would be higher.
C. There would be no change. The inputs are reversed, therefore the
circuit cannot function.
D. None of the above.
Ans: A
3-32D1 Given the combined DC input voltages, what would the output
voltage be in the circuit shown in Figure 3D7?
A. 150 mV
B. 5.5 V
C. -15 mv
D. -5.5 V
Ans: D
3-32D2 Which lamps would be lit in the circuit shown in Figure 3D8?
A. 2, 3, 4, 5 and 6.
B. 5, 6, 8 and 9.
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C. 2, 3, 4, 7 and 8.
D. 1, 3, 5, 7 and 8.
Ans: C
3-32D3 What will occur if an amplifier input signal coupling capacitor
fails open?
A. No amplification will occur, with DC within the circuit measuring
normal.
B. Improper biasing will occur within the amplifier stage.
C. Oscillation and thermal runaway may occur.
D. An AC hum will appear on the circuit output.
Ans: A
3-32D4 In Figure 3D9, determine if there is a problem with this
regulated power supply and identify the problem.
A. R1 value is too low which would cause excessive base current and
instantly destroy TR 1.
B. D1 and D2 are reversed. The power supply simply would not
function.
C. TR1 is shown as an NPN and must be changed to a PNP.
D. There is no problem with the circuit.
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