Operational Amplifiers: Configurations, Non-Idealities, and Stability Quiz

Test your knowledge on the basics of operational amplifier common configurations, non-ideal behaviors, and introductory stability concepts. This quiz covers key fundamental ideas suitable for beginners.

1. Inverting Amplifier Configuration

   Which configuration has the input signal applied to the inverting terminal and provides a phase-shifted output of 180 degrees?

   1. Summing amplifier
   2. Differente amplifier
   3. Inverting amplifier
   4. Integrator amplifier
   5. Non-inverting amplifier

2. Ideal Op-Amp Input Impedance

   What is the value of the input impedance of an ideal operational amplifier?

   1. Ten ohms
   2. One kiloohm
   3. Zero ohms
   4. 106 ohms
   5. Infinite ohms

3. Non-inverting Amplifier Gain

   In a simple non-inverting op-amp circuit using resistors R1 (feedback) and R2 (to ground), what is the voltage gain formula?

   1. Gain = R1 + R2
   2. Gain = 1/R1 + R2
   3. Gain = 1 + R1/R2
   4. Gain = R1 - R2
   5. Gain = R2/R1

4. Offset Voltage Non-Ideality

   Which non-ideality describes a small unwanted voltage that appears at the output even when both inputs are grounded?

   1. Bias voltage
   2. Slew rate
   3. Open loop voltage
   4. Offset voltage
   5. Drift voltage

5. Integrator Op-Amp Output Behavior

   If a constant (DC) voltage is applied to the input of an ideal op-amp integrator circuit, what shape will the output waveform have?

   1. Triangle
   2. Square
   3. Ramp
   4. Sinusoidal
   5. Pulse

6. Op-Amp Slew Rate Definition

   What term describes the maximum rate at which the output voltage of an op-amp can change, for example, in response to a step input?

   1. Gain bandwidth
   2. Common mode rejection
   3. Slew rat
   4. Swlew rate
   5. Slew rate

7. Purpose of the Voltage Follower

   Why might you use an op-amp voltage follower (buffer) in a circuit?

   1. To invert the signal
   2. To provide high output impedance
   3. To provide unity gain and high input impedance
   4. To act as an oscillator
   5. To amplify the signal

8. Common-Mode Rejection Ratio (CMRR)

   What does the common-mode rejection ratio (CMRR) of an op-amp measure?

   1. Rejection of noise
   2. The amount of power consumed
   3. Rejection of input offset voltage
   4. Ability to amplify high frequencies
   5. Ability to suppress signals common to both inputs

9. Stability and Frequency Response

   Why is frequency compensation often added to op-amp circuits?

   1. To add more noise
   2. To increase the input offset
   3. To create more gain
   4. To ensure stability and prevent oscillations
   5. To decrease the input impedance

10. Output Saturation in Real Op-Amps

    When an op-amp is operated with supply voltages of +15V and -15V, what typically happens if the output attempts to exceed the supply voltages?

    1. The input voltage is limited
    2. The output increases endlessly
    3. The output becomes inverted
    4. The output multiplies
    5. The output saturates near the supply rails