Extra exam question E4E03
Subelement E4, AMATEUR PRACTICES· Group E4E
Which of the following types of noise are removed by a noise blanker?
- A.Broadband white noise
- B.Impulse noise (correct answer)
- C.Hum and buzz
- D.All these choices are correct
WhyA noise blanker is designed to remove impulse noise. A noise blanker is specifically built to remove impulse noise, brief, sharp spikes like ignition noise or switching transients, by momentarily muting the receiver each time it detects one of those short pulses, answer B. Broadband white noise and steady hum or buzz aren't impulsive in nature and aren't what a noise blanker is designed to remove, those call for different noise-reduction approaches.
Published 2026-08-28 · Last updated 2026-08-28 · Question text is verbatim from the 2024-2028 NCVEC Element 4 pool (public domain); the explanation above is original writing, see our methodology.
Related questions
- E4E01What problem can occur when using an automatic notch filter (ANF) to remove interfering carriers while receiving CW signals?
- E4E02Which of the following types of noise can often be reduced by a digital noise reduction?
- E4E04How can conducted noise from an automobile battery charging system be suppressed?
- E4E05What is used to suppress radio frequency interference from a line-driven AC motor?
- E4E06What type of electrical interference can be caused by computer network equipment?