1 Can you combine a low pass filter and a high pass filter t

1. Can you combine a low pass filter and a high pass filter to make a band reject filter? Please explain your reasoning.

a.Why is ground (neutral) unnecessary in a balanced Y connected three-phase system? Give an example.

1. BY CASCADING a LOW PASS FILTER with HIGH PASS FILTER a BAND REJECT FILTER can be implemented with the following conditions-

(i) Pass band gain of both Low pass filter and High pass filter must be equal

(ii) The upper cut off frequency of low pass filter should be less than lower cut off frequency of high pass filter

case (A)- if upper cutoff frequency is much less than lower cut off frequency than a WIDE BAND REJECT FILTER will result

case(B)- if upper cutoff frequency is slightly less than lower cut off frequency than a NARROW BAND REJECT FILTER or NOTCH FILTER will result