Why Parallel Resonant Circuit Is Called Rejector Circuit?

As a parallel resonance circuit only functions on resonant frequency, this type of circuit is also known as an Rejecter Circuit because at resonance, the impedance of the circuit is at its maximum thereby suppressing or rejecting the current whose frequency is equal to its resonant frequency.

Which circuit is called as Rejector circuit?

Parallel resonant circuit is used as filter circuit because such circuit rejects the currents corresponding to the parallel resonant frequencies and allow other frequencies to pass, hence called as filter circuit or rejector circuit.

Why is a series resonant circuit called an acceptor circuit & parallel resonant circuit is called Rejecter circuit?

As a series resonance circuit only functions on resonant frequency, this type of circuit is known as an Acceptor Circuit because at resonance, the impedance of the circuit is at its minimum so easily accepts the current whose frequency is equal to its resonant frequency.