Home » Alternating Current » 5 » a An impure signal is found to have 2 kHz and 4 kHz components. This 4 kHz signal is: a. b. a sub-harmonic of 2 kHz c. the DC component of the main signal d. a harmonic of the 2 kHz signal Your answer "a" is not correct. "d" is the right answer. It is actually the second harmonic, because it is two times the other frequency. Next |