Question

Regarding AC circuit, match the followings. (symbols have their usual meanings)

1.	Quality factor	(i)	Parallel LCR
2.	Power factor	(ii)	Series LCR
3.	Acceptor circuit	(iii)	$\frac{R}{Z}$
4.	Rejector circuit	(iv)	$\frac{1}{R}\sqrt{\frac{L}{C}}$

Answer 1

1-(iv), 2-(iii), 3-(ii), 4-(i)

Answer 2

1. Quality factor ($Q$): For a series LCR circuit, $Q = \frac{1}{R}\sqrt{\frac{L}{C}}$. This matches with (iv).
2. Power factor ($\cos \phi$): Defined as the ratio of resistance to impedance, $\cos \phi = \frac{R}{Z}$. This matches with (iii).
3. Acceptor circuit: A series LCR circuit that resonates at a specific frequency, allowing maximum current. This matches with (ii).
4. Rejector circuit: A parallel LCR circuit that resonates at a specific frequency, offering maximum impedance. This matches with (i).