Operational Amplifier MCQs Quiz Multiple Choice Questions & Answers

1. An ideal operational amplifier has

1. Infinite output impedance
2. Zero input impedance
3. Infinite bandwidth
4. All of the above

2. Another name for a unity gain amplifier is:

1. Difference amplifier
2. Comparator
3. Single ended
4. Voltage follower

3. Op-amps used as high- and low-pass filter circuits employ which configuration?

1. Noninverting
2. Comparator
3. Open-loop
4. Inverting

4. With negative feedback, the returning signal:

1. Aids the input signal
2. Is proportional to output current
3. Opposes the input signal
4. Is proportional to differential voltage gain

5. A circuit whose output is proportional to the difference between the input signals is considered to be which type of amplifier?

1. Common-mode
2. Darlington
3. Differential
4. Operational

6. The voltage follower has a:

1. Closed-loop voltage gain of unity
2. Small open-loop voltage gain
3. Closed-loop bandwidth of zero
4. Large closed-loop output impedance

7. The ratio between differential gain and common-mode gain is called:

1. Amplitude
2. Differential-mode rejection
3. Common-mode rejection
4. Phase

8. If the input to a comparator is a sine wave, the output is a:

1. Ramp voltage
2. Sine wave
3. Rectangular wave
4. Sawtooth wave

9. The major difference between ground and virtual ground is that virtual ground is only a:

1. Voltage reference
2. Current reference
3. Power reference
4. Difference reference

10. When a capacitor is used in place of a resistor in an op-amp network, its placement determines:

1. Open or closed-loop gain
2. Integration or differentiation
3. Saturation or cutoff
4. Addition or subtraction