AMS 380 UNIT 3 EXAM QUESTIONS WITH CORRECT ANSWERS LATEST UPDATE 2026
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. - Answers 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. - Answers C
3-30D3 Gain of a closed-loop op-amp circuit is determined by?
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. - Answers 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. - Answers 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. - Answers D
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. - Answers 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 - Answers 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.
C. 2, 3, 4, 7 and 8.
D. 1, 3, 5, 7 and 8. - Answers 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. - Answers 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. - Answers D
3-32D5 In Figure 3D10 with a square wave input what would be the output?
A. 1
B. 2
, C. 3
D. 4 - Answers C
3-32D6 With a pure AC signal input to the circuit shown in Figure 3D11, what output wave form would
you expect to see on an oscilloscope display?
A. 1
B. 2
C. 3
D. 4 - Answers B
3-33E1 What is the voltage range considered to be valid logic low input in a TTL device operating at 5
volts?
A. 2.0 to 5.5 volts.
B. -2.0 to -5.5 volts.
C. Zero to 0.8 volts.
D. 5.2 to 34.8 volts. - Answers C
3-33E2 What is the voltage range considered to be a valid logic high input in a TTL device operating at
5.0 volts?
A. 2.0 to 5.5 volts.
B. 1.5 to 3.0 volts.
C. 1.0 to 1.5 volts.
D. 5.2 to 34.8 volts. - Answers A
3-33E3 What is the common power supply voltage for TTL series integrated circuits?
A. 12 volts.
B. 13.6 volts.
C. 1 volt.
D. 5 volts. - Answers D
3-33E4 TTL inputs left open develop what logic state?
A. A high-logic state.
B. A low-logic state.
C. Open inputs on a TTL device are ignored.
D. Random high- and low-logic states. - Answers A
3-33E5 Which of the following instruments would be best for checking a TTL logic circuit?
A. VOM.
B. DMM.
C. Continuity tester.
D. Logic probe. - Answers D
3-33E6 What do the initials TTL stand for?
A. Resistor-transistor logic.
B. Transistor-transistor logic.
C. Diode-transistor logic.
D. Emitter-coupled logic. - Answers B
3-34E1 What is a characteristic of an AND gate?
A. Produces a logic "0" at its output only if all inputs are logic "1".
B. Produces a logic "1" at its output only if all inputs are logic "1".
C. Produces a logic "1" at its output if only one input is a logic "1".
D. Produces a logic "1" at its output if all inputs are logic "0". - Answers B
3-34E2 What is a characteristic of a NAND gate?
A. Produces a logic "0" at its output only when all inputs are logic "0".
B. Produces a logic "1" at its output only when all inputs are logic "1".
C. Produces a logic "0" at its output if some but not all of its inputs are logic "1".
D. Produces a logic "0" at its output only when all inputs are logic "1". - Answers D
3-34E3 What is a characteristic of an OR gate?
A. Produces a logic "1" at its output if any input is logic "1".
B. Produces a logic "0" at its output if any input is logic "1".
C. Produces a logic "0" at its output if all inputs are logic "1".
D. Produces a logic "1" at its output if all inputs are logic "0". - Answers A
3-34E4 What is a characteristic of a NOR gate?
A. Produces a logic "0" at its output only if all inputs are logic "0".
, B. Produces a logic "1" at its output only if all inputs are logic "1".
C. Produces a logic "0" at its output if any or all inputs are logic "1".
D. Produces a logic "1" at its output if some but not all of its inputs are logic "1". - Answers C
3-34E5 What is a characteristic of a NOT gate?
A. Does not allow data transmission when its input is high.
B. Produces a logic "0" at its output when the input is logic "1" and vice versa.
C. Allows data transmission only when its input is high.
D. Produces a logic "1" at its output when the input is logic "1" and vice versa. - Answers B
3-34E6 Which of the following logic gates will provide an active high out when both inputs are active
high?
A. NAND.
B. NOR.
C. AND.
D. XOR. - Answers C
3-35E1 In a negative-logic circuit, what level is used to represent a logic 0?
A. Low level. C. Negative-transition level.
B. Positive-transition level. D. High level. - Answers D
3-35E2 For the logic input levels shown in Figure 3E12, what are the logic levels of test points A, B and
C in this circuit? (Assume positive logic.)
A. A is high, B is low and C is low.
B. A is low, B is high and C is high.
C. A is high, B is high and C is low.
D. A is low, B is high and C is low. - Answers B
3-35E3 For the logic input levels given in Figure 3E13, what are the logic levels of test points A, B and
C in this circuit? (Assume positive logic.)
A. A is low, B is low and C is high.
B. A is low, B is high and C is low.
C. A is high, B is high and C is high.
D. A is high, B is low and C is low. - Answers C
3-35E4 In a positive-logic circuit, what level is used to represent a logic 1?
A. High level
B. Low level
C. Positive-transition level
D. Negative-transition level - Answers A
3-35E5 Given the input levels shown in Figure 3E14 and assuming positive logic devices, what would
the output be?
A. A is low, B is high and C is high. C. A is low, B is low and C is high.
B. A is high, B is high and C is low. D. None of the above are correct. - Answers A
3-35E6 What is a truth table?
A. A list of input combinations and their corresponding outputs that characterizes a digital device's
function.
B. A table of logic symbols that indicate the high logic states of an op-amp.
C. A diagram showing logic states when the digital device's output is true.
D. A table of logic symbols that indicates the low logic states of an op-amp. - Answers A
3-36E1 A flip-flop circuit is a binary logic element with how many stable states?
A. 1
B. 2
C. 4
D. 8 - Answers B
3-36E2 What is a flip-flop circuit? A binary sequential logic element with ___stable states.
A. 1
B. 4
C. 2
D. 8 - Answers C
3-36E3 How many flip-flops are required to divide a signal frequency by 4?
A. 1
B. 4
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. - Answers 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. - Answers C
3-30D3 Gain of a closed-loop op-amp circuit is determined by?
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. - Answers 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. - Answers 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. - Answers D
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. - Answers 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 - Answers 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.
C. 2, 3, 4, 7 and 8.
D. 1, 3, 5, 7 and 8. - Answers 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. - Answers 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. - Answers D
3-32D5 In Figure 3D10 with a square wave input what would be the output?
A. 1
B. 2
, C. 3
D. 4 - Answers C
3-32D6 With a pure AC signal input to the circuit shown in Figure 3D11, what output wave form would
you expect to see on an oscilloscope display?
A. 1
B. 2
C. 3
D. 4 - Answers B
3-33E1 What is the voltage range considered to be valid logic low input in a TTL device operating at 5
volts?
A. 2.0 to 5.5 volts.
B. -2.0 to -5.5 volts.
C. Zero to 0.8 volts.
D. 5.2 to 34.8 volts. - Answers C
3-33E2 What is the voltage range considered to be a valid logic high input in a TTL device operating at
5.0 volts?
A. 2.0 to 5.5 volts.
B. 1.5 to 3.0 volts.
C. 1.0 to 1.5 volts.
D. 5.2 to 34.8 volts. - Answers A
3-33E3 What is the common power supply voltage for TTL series integrated circuits?
A. 12 volts.
B. 13.6 volts.
C. 1 volt.
D. 5 volts. - Answers D
3-33E4 TTL inputs left open develop what logic state?
A. A high-logic state.
B. A low-logic state.
C. Open inputs on a TTL device are ignored.
D. Random high- and low-logic states. - Answers A
3-33E5 Which of the following instruments would be best for checking a TTL logic circuit?
A. VOM.
B. DMM.
C. Continuity tester.
D. Logic probe. - Answers D
3-33E6 What do the initials TTL stand for?
A. Resistor-transistor logic.
B. Transistor-transistor logic.
C. Diode-transistor logic.
D. Emitter-coupled logic. - Answers B
3-34E1 What is a characteristic of an AND gate?
A. Produces a logic "0" at its output only if all inputs are logic "1".
B. Produces a logic "1" at its output only if all inputs are logic "1".
C. Produces a logic "1" at its output if only one input is a logic "1".
D. Produces a logic "1" at its output if all inputs are logic "0". - Answers B
3-34E2 What is a characteristic of a NAND gate?
A. Produces a logic "0" at its output only when all inputs are logic "0".
B. Produces a logic "1" at its output only when all inputs are logic "1".
C. Produces a logic "0" at its output if some but not all of its inputs are logic "1".
D. Produces a logic "0" at its output only when all inputs are logic "1". - Answers D
3-34E3 What is a characteristic of an OR gate?
A. Produces a logic "1" at its output if any input is logic "1".
B. Produces a logic "0" at its output if any input is logic "1".
C. Produces a logic "0" at its output if all inputs are logic "1".
D. Produces a logic "1" at its output if all inputs are logic "0". - Answers A
3-34E4 What is a characteristic of a NOR gate?
A. Produces a logic "0" at its output only if all inputs are logic "0".
, B. Produces a logic "1" at its output only if all inputs are logic "1".
C. Produces a logic "0" at its output if any or all inputs are logic "1".
D. Produces a logic "1" at its output if some but not all of its inputs are logic "1". - Answers C
3-34E5 What is a characteristic of a NOT gate?
A. Does not allow data transmission when its input is high.
B. Produces a logic "0" at its output when the input is logic "1" and vice versa.
C. Allows data transmission only when its input is high.
D. Produces a logic "1" at its output when the input is logic "1" and vice versa. - Answers B
3-34E6 Which of the following logic gates will provide an active high out when both inputs are active
high?
A. NAND.
B. NOR.
C. AND.
D. XOR. - Answers C
3-35E1 In a negative-logic circuit, what level is used to represent a logic 0?
A. Low level. C. Negative-transition level.
B. Positive-transition level. D. High level. - Answers D
3-35E2 For the logic input levels shown in Figure 3E12, what are the logic levels of test points A, B and
C in this circuit? (Assume positive logic.)
A. A is high, B is low and C is low.
B. A is low, B is high and C is high.
C. A is high, B is high and C is low.
D. A is low, B is high and C is low. - Answers B
3-35E3 For the logic input levels given in Figure 3E13, what are the logic levels of test points A, B and
C in this circuit? (Assume positive logic.)
A. A is low, B is low and C is high.
B. A is low, B is high and C is low.
C. A is high, B is high and C is high.
D. A is high, B is low and C is low. - Answers C
3-35E4 In a positive-logic circuit, what level is used to represent a logic 1?
A. High level
B. Low level
C. Positive-transition level
D. Negative-transition level - Answers A
3-35E5 Given the input levels shown in Figure 3E14 and assuming positive logic devices, what would
the output be?
A. A is low, B is high and C is high. C. A is low, B is low and C is high.
B. A is high, B is high and C is low. D. None of the above are correct. - Answers A
3-35E6 What is a truth table?
A. A list of input combinations and their corresponding outputs that characterizes a digital device's
function.
B. A table of logic symbols that indicate the high logic states of an op-amp.
C. A diagram showing logic states when the digital device's output is true.
D. A table of logic symbols that indicates the low logic states of an op-amp. - Answers A
3-36E1 A flip-flop circuit is a binary logic element with how many stable states?
A. 1
B. 2
C. 4
D. 8 - Answers B
3-36E2 What is a flip-flop circuit? A binary sequential logic element with ___stable states.
A. 1
B. 4
C. 2
D. 8 - Answers C
3-36E3 How many flip-flops are required to divide a signal frequency by 4?
A. 1
B. 4
