Match List I with List II.

List I	List II
(a) Rectifier	(i) Used either for stepping up or stepping down the A.C. voltage
(b) Stabilizer	(ii) Used to convert A.C. voltage into D.C. voltage
(c) Transformer	(iii) Used to remove any ripple in the rectified output voltage
(d) Filter	(iv) Used for constant output voltage even when the input voltage or load current change

Choose the correct answer from the options given below:

We match each device in List I with its correct description in List II.

(a) A rectifier is a device that converts alternating current (A.C.) voltage into direct current (D.C.) voltage. This matches description (ii).

(b) A stabilizer (voltage regulator) is a device used to maintain a constant output voltage even when the input voltage or load current changes. This matches description (iv).

(c) A transformer is a device used either for stepping up or stepping down the A.C. voltage. This matches description (i).

(d) A filter is a circuit used to remove any ripple in the rectified output voltage, producing a smoother D.C. output. This matches description (iii).

Therefore, the correct matching is (a)-(ii), (b)-(iv), (c)-(i), (d)-(iii).