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Extra-Study/pages/E7G.md
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E7G Operational amplifiers: characteristics and applications

  • E7G01 (A) What is the typical output impedance of an op-amp? #card
    • A. Very low
    • B. Very high
    • C. 100 ohms
    • D. 10,000 ohms
  • E7G02 (B) What is the frequency response of the circuit in E7-3 if a capacitor is added across the feedback resistor? #card
    • A. High-pass filter
    • B. Low-pass filter
    • C. Band-pass filter
    • D. Notch filter
  • E7G03 (D) What is the typical input impedance of an op-amp? #card
    • A. 100 ohms
    • B. 10,000 ohms
    • C. Very low
    • D. Very high
  • E7G04 (C) What is meant by the term “op-amp input offset voltage”? #card
    • A. The output voltage of the op-amp minus its input voltage
    • B. The difference between the output voltage of the op-amp and the input voltage required in the immediately following stage
    • C. The differential input voltage needed to bring the open loop output voltage to zero
    • D. The potential between the amplifier input terminals of the op-amp in an open loop condition
  • E7G05 (A) How can unwanted ringing and audio instability be prevented in an op-amp audio filter? #card
    • A. Restrict both gain and Q
    • B. Restrict gain but increase Q
    • C. Restrict Q but increase gain
    • D. Increase both gain and Q
  • E7G06 (B) What is the gain-bandwidth of an operational amplifier? #card
    • A. The maximum frequency for a filter circuit using that type of amplifier
    • B. The frequency at which the open-loop gain of the amplifier equals one
    • C. The gain of the amplifier at a filter’s cutoff frequency
    • D. The frequency at which the amplifier’s offset voltage is zero
  • E7G07 (C) What voltage gain can be expected from the circuit in Figure E7‑3 when R1 is 10 ohms and RF is 470 ohms? #card
  • E7G08 (D) How does the gain of an ideal operational amplifier vary with frequency? #card
    • A. It increases linearly with increasing frequency
    • B. It decreases linearly with increasing frequency
    • C. It decreases logarithmically with increasing frequency
    • D. It does not vary with frequency
  • E7G09 (D) What will be the output voltage of the circuit shown in Figure E7-3 if R1 is 1,000 ohms, RF is 10,000 ohms, and 0.23 volts DC is applied to the input? #card
    • A. 0.23 volts
    • B. 2.3 volts
    • C. -0.23 volts
    • D. -2.3 volts
  • E7G10 (C) What absolute voltage gain can be expected from the circuit in Figure E7-3 when R1 is 1,800 ohms and RF is 68 kilohms? #card
  • E7G11 (B) What absolute voltage gain can be expected from the circuit in Figure E7-3 when R1 is 3,300 ohms and RF is 47 kilohms? #card
  • E7G12 (A) What is an operational amplifier? #card
    • A. A high-gain, direct-coupled differential amplifier with very high input impedance and very low output impedance
    • B. A digital audio amplifier whose characteristics are determined by components external to the amplifier
    • C. An amplifier used to increase the average output of frequency modulated amateur signals to the legal limit
    • D. A RF amplifier used in the UHF and microwave regions