Q. The inputs and outputs for different time intervals are given below the NAND gate. [table] $\mathbf{Time}$ | $\mathbf{Input}\mathbf{\ }$ $\mathbf{A}$ | $\mathbf{Input}\mathbf{\ }$ $\mathbf{B}$ | $\mathbf{Output}$ $\mathbf{\ }\mathbf{Y}$ ; $t_{1}\ to\ t_{2}$ $t_{2}\ to\ t_{3}$ $t_{3}\ to\ t_{4}$ $t_{4}\ to\ t_{5}$ | 0 0 1 1 | 1 0 0 1 | P Q R S [/table] The values taken by P, Q, R, S are respectively
A) 1, 1, 1, 0
B) 0, 1, 0, 1
C) 0, 1, 0, 0
D) 1, 0, 1, 1
Explanation
(a) NAND gate is obtained when the output of AND gate is made as the input of NOT gate Boolean expression for NAND gate is
[image:14_image237.jpeg]
$Y = \overline{A \bullet B}$
[table] $\mathbf{A}$ | $\mathbf{B}$ | $\mathbf{Y}$ ; $0$ $1$ $0$ $1$ | $0$ $0$ $1$ $1$ | $1$ $1$ $1$ $0$ [/table]
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.