E4E06 - Amateur Extra Class

E4E06 : What type of electrical interference can be caused by computer network equipment?
A A loud AC hum in the audio output of your stations receiver
B A clicking noise at intervals of a few seconds
C The appearance of unstable modulated or unmodulated signals at specific frequencies
D A whining-type noise that continually pulses off and on
Correct Answer: The appearance of unstable modulated or unmodulated signals at specific frequencies