Quiz 4 on Operational Amplifiers

What is the primary function of an operational amplifier (op-amp)?

• To decrease the amplitude of signals

• To amplify electrical signals

• To convert digital signals to analog

• To store electrical energy

What is the ideal input impedance of an op-amp?

• Zero ohms

• Infinite ohms

• 1000 ohms

• 10 ohms

What happens when the output of an op-amp is connected to its inverting input?

• It creates a positive feedback loop

• It stabilizes the output

• It increases the gain

• It causes the output to oscillate

Which of the following is a characteristic of a non-inverting amplifier?

• It requires a feedback resistor

• The output is in phase with the input

• The gain is less than one

• The output is inverted

What is the purpose of negative feedback in an op-amp circuit?

• To increase the gain

• To stabilize the output

• To reduce input impedance

• To create distortion

In an inverting amplifier, what is the relationship between the input voltage and output voltage?

• Vout = Vin + 1

• Vout = -Vin

• Vout = Vin/2

• Vout = Vin

What is the function of a summing amplifier?

• To amplify a single input signal

• To subtract two input signals

• To add multiple input signals

• To filter out noise

What is the output of a differentiator circuit?

• The sum of the input signals

• The integral of the input signal

• The derivative of the input signal

• The average of the input signals

Which of the following describes the output impedance of an ideal op-amp?

• Infinite output impedance

• High output impedance

• Zero output impedance

• Variable output impedance

What is the effect of high input impedance in an op-amp?

• Reduces noise

• Decreases accuracy

• Increases current draw

• Increases loading effect