Certified Biomedical Equipment Technician (CBET) 2025 – 400 Free Practice Questions to Pass the Exam

The filter design that aims for a zero output at a specific frequency is the notch filter. Notch filters are specifically designed to attenuate a narrow band of frequencies while allowing all others to pass with little to no attenuation. This is achieved by creating a deep attenuation notch at the targeted frequency, effectively producing a zero output there.

In applications such as audio systems or communication devices, notch filters are especially useful for eliminating unwanted interference or noise that operates at the specific frequency that needs to be filtered out. The notch filter allows for clear signal transmission and improved overall system performance by ensuring that the specified frequency does not interfere with the desired signals.

The other filter types listed do not focus on creating a zero output at a specific frequency in the same way. Pi-type and L-type filters are more general designs that manage the flow of frequencies without targeting a specific one for attenuation. Capacitive Input L-Type filters function similarly, but they do not specifically aim for zero output at a particular frequency. The unique purpose of the notch filter is what makes it the correct choice in this scenario.