question_answer

                Which one of the following gates will have an output of 1 ?                                                                                                     

A)                 A                                            

B)                 B            

C)                                            C            

D)                            D

Correct Answer: C

Solution :

Gate A is NAND gate, is output will be                 \[{{Y}_{A}}=\overline{1.1}=\bar{1}=0\]                 Gate B is NOR gate, is output will be                 \[{{Y}_{B}}=\overline{1+1}=\bar{1}=0\]                 Gate C is NAND gate, its output will be                 \[{{Y}_{C}}=\overline{0.1}=\overline{0}=1\]                 Gate D is XOR gate, its output will be                 \[{{Y}_{D}}=0\oplus 0=0\cdot \overline{0}+\overline{0}\cdot 0=0\]                 Thus, gate (c) will give an output of 1.                 Note:    Option (d) represents a logic symbol of exclusive OR gate or XOR gate. Its descriptive form showing is Boolean expression may be represented as: