Question
Identify the gate shown in the figure. Explain with the help of a circuit diagram, how this gate is realised in practice.
Solution
The gate shown in the figure is OR gate. 
(i) When A = 0, and B = 0, both diodes are reverse biased, hence Y = 0.
(ii) When A = 0, and B = 1, diode D2 is forward biased, hence Y = 1.
(iii) When A = 1, and B = 0, diode D1 is forward biased, hence Y = 1.
(iv) When A = 1, and B = 1, diode D1 and D2 both are forward biased, hence Y = 1.
