Op-Amp and IC 555 Timer Quiz

Which filter allows only frequencies below a cutoff frequency to pass?

• Band-pass filter

• High-pass filter

• Low-pass filter

• Notch filter

The gain of an active low-pass filter with a non-inverting configuration is given by:

• 1 + (R2/R1)

• R2/R1

• (R1 + R2)/R1

• R1/R2

Which component determines the cutoff frequency in an RC low-pass filter?

• Only resistor

• Only capacitor

• Both resistor and capacitor

• Inductor

Which type of filter can be constructed using op-amps and has two cutoff frequencies?

• Band-pass filter

• Low-pass filter

• High-pass filter

• All-pass filter

An active high-pass filter blocks:

• High-frequency signals

• Low-frequency signals

• Mid-band signals

• All signals

The purpose of an all-pass filter is to:

• Block all frequencies

• Allow a specific frequency range

• Pass all frequencies equally while altering the phase

• Increase gain at cutoff

Which of the following is not a sine wave oscillator using op-amps?

• Wein bridge oscillator

• Phase-shift oscillator

• Crystal oscillator

• Colpitts oscillator

In a Wien bridge oscillator, the feedback network consists of:

• Inductors and resistors

• Capacitors and resistors

• Transistors

• Transformers

The frequency of oscillation for a phase-shift oscillator is determined by:

• L and C values

• R and C values

• R and L values

• Op-amp gain

Barkhausen criterion for sustained oscillation states:

• Loop gain = 0

• Loop gain < 1

• Loop gain = 1 and total phase shift = 360°

• Loop gain > 1