Q.

When noise is passed through a narrow band filter, the output of filter should be?

A. triangular
B. square
C. parabolic
D. sinusoidal
Answer» D. sinusoidal
Explanation: narrow band filter is used to isolate a narrow band of frequencies from a wider bandwidth signal. it is a combination of band pass and band reject filter. when noise gets passed through it, the output of it should be sinusoidal.
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