What type of filter allows low frequencies to pass from the generator to the load device and blocks, or attenuates, high frequencies?

What type of filter allows low frequencies to pass from the generator to the load device and blocks, or attenuates, high frequencies?

• A. Low-pass
• B. Use of Crystals
• C. LC Tank Oscillator
• D. Demodulation

Answer: (A)

A low-pass filter is designed to pass low frequencies while attenuating higher frequencies. In a generator-to-load path, this means the slow-changing parts of the signal (including DC) get through with little loss, while any rapid fluctuations or RF noise above the cutoff are reduced. This keeps the load device from seeing high-frequency content that could cause interference or excess noise. Simple low-pass implementations use RC or LC networks, with the cutoff set where you want the transition to happen. Other options aren’t general low-pass filters: crystals can act as very selective frequency elements but are typically used for narrowband filtering or frequency stabilization rather than a broad low-pass function; an LC tank oscillator is a resonant circuit used to generate or select a specific RF frequency, not to pass all low frequencies while blocking high ones; and demodulation is the process of extracting the original information from a modulated signal, not a filtering method.

A low-pass filter is designed to pass low frequencies while attenuating higher frequencies. In a generator-to-load path, this means the slow-changing parts of the signal (including DC) get through with little loss, while any rapid fluctuations or RF noise above the cutoff are reduced. This keeps the load device from seeing high-frequency content that could cause interference or excess noise. Simple low-pass implementations use RC or LC networks, with the cutoff set where you want the transition to happen.

Other options aren’t general low-pass filters: crystals can act as very selective frequency elements but are typically used for narrowband filtering or frequency stabilization rather than a broad low-pass function; an LC tank oscillator is a resonant circuit used to generate or select a specific RF frequency, not to pass all low frequencies while blocking high ones; and demodulation is the process of extracting the original information from a modulated signal, not a filtering method.