### Digital Electronics Objectives Part 06

**101 . ** ** AND **gate is similar to the function of two series switches.

**102 . ** ** OR **gate is similar to the function of two parallel switches.

**103 . ** **NAND** logic function has the output low only when both inputs are high.

**104 .** ** X + X = 0 **is invalid according to Boolean algebra.

**105 . ** ** XX = 1** is not valid according to Boolean algebra.

**106 .** According to Boolean algebra **πΏΜ
= 1 **is not valid relation.

**107 .** **X(X + Y) = 1 **is not valid according to Boolean algebra.

**108 . ** **XY + YZ + πZ = XYZ **is not valid according to Boolean algebra.

**109 . ** According to Boolean algebra 1 + A + B + C is equal to** 1.**

**110 . ** (A + π΅ + π΄B) is same as **1.**

**111 . ** A (A +B) is same as** A + AB.**

**112 . ** Three Boolean operators are **OR, NOT, AND.**

**113 .** n Boolean algebra A+A+A+β¦.+A is same as **A.**

**114 . ** If A = 0, B = 0, then π΄π΅ is **1.**

**115 . ** The truth table is given below is for **AND gate.**

**116 . ** **A.B = Y** is Boolean function of AND gate.

**117 . ** Positive logic in a logic circuit is one in which** logic 0 voltage level is lower than logic 1 voltage level.**

**118 . ** A + B = Y is the Boolean function for** OR** gate.

**119 . ** In case of OR gate, no matter what the number of inputs, are **1 at any input causes the output to be at logic 1.**

**120 . ** The truth table is given below is for **OR gate.**