Arrange the following steps for working of a full wave rectifier in correct sequence.

(A) During the negative half cycle, $D_1$ is reverse biased while $D_2$ is forward biased.
(B) During the positive half cycle, $D_1$ is forward biased while $D_2$ is reverse biased.
(C) A pulsating d. c. voltage is obtained across $R_L$
(D) a. c. input is given to the primary of a centre-tap transformer

Choose the correct answer from the options given below:

(D), (B), (A), (C)

The correct answer is Option (4) → (D), (B), (A), (C)

Correct sequence of steps for the working of a full wave rectifier:

① (D) a.c. input is applied to the primary of a centre-tap transformer

② (B) In the positive half cycle, $D_1$ conducts (forward biased) and $D_2$ is reverse biased

③ (A) In the negative half cycle, $D_1$ is reverse biased and $D_2$ conducts (forward biased)

④ (C) The output obtained across $R_L$ is a pulsating d.c. voltage

Thus, the correct order is: D → B → A → C