Question

(i) Explain briefly, with the help of circuit diagram, the working of a full wave rectifier. Draw its input and output wave forms.

(ii) Identify the logic gate equivalent to the circuit shown in the figure.

Draw the truth table for all possible values of inputs A and B.

Answer 1

During first half cycle of input a.c., one diode will act as forward biased and conduct, while other diode which is reverse biased will not conduct. In other half cycle of input signal, the reverse biased diode will get forward biased and hence will conduct while other diode gets reverse biased and will not conduct. In such case, we will achieve unidirectional output voltage for positive and negative half cycle.

(ii) Identification : AND Gate

Truth Table 

Input		Output
A	B	Y
0	0	0
0	1	0
1	0	0
1	1	1