Question

In the circuit, the logical value of $A=1$ or $B=1$ when potential at $A$ or $B$ is $5V$ and the logical value of $A=0$ or $B=0$ when potential at $A$ or $B$ is $0V$.

The truth table of the given circuit will be :

• A.
• B.
• C.
• D.

Answer 1

Answer: (A)

When both $A$ and $B$ have logical value ' $1$ '
both diode are reverse bias and current will flow in resistor hence output will be $5$ volt i.e. logical value ' $1$ '.
In all other case conduction will take place, hence output will be zero volt i.e. logical value ' $0$ '.
So truth table is