### 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 𝑿̅ = 1 is not valid relation.

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

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

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

110 . (A + 𝐵 + 𝐴B) 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+….+A is same as A.

114 . If A = 0, B = 0, then 𝐴𝐵 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.