A 4 kHz square wave of duty cycle 50% and p-p (0.2V to +0.2V) is applied as input to 20 kHz narrow bandpass filter which is followed by an amplifier of voltage gain 20. Find out the frequency components present in the output. Given that cut off frequencies of a narrow bandpass filter is 20 kHz and 40 kHz.

A 4 kHz square wave of duty cycle 50% and p-p (0.2V to +0.2V) is appli

1.	A 4 kHz square wave of duty cycle 50% and p-p (0.2V to +0.2V) is applied as input to 20 kHz narrow bandpass filter which is followed by an amplifier of voltage gain 20. Find out the frequency components present in the output. Given that cut off frequencies of a narrow bandpass filter is 20 kHz and 40 kHz.
A.	12 kHz, 20 kHz, 28 kHz
B.	20 kHz, 28 kHz, 36 kHz
C.	20 kHz, 28 kHz, 32 kHz
D.	20 kHz, 24 kHz, 28 kHz
Answer» C. 20 kHz, 28 kHz, 32 kHz

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