### Digital Electronics Objectives Part 09

**161 . ** The bubble or small circle on the output of the NAND gate and NOR gate represents **Complementation.**

**162 . ** The output of the circuit shown in Fig. 27 will be** Y(πΏ + Z).**

**163.****164.**

**165 . ** The output from AND-to-OR gate combination, shown in Fig. 30 will be** πΏ π+ πΏππ.**

**166 .** The complement of (A + BC + AB) is **π¨(πΜ
+πΜ
).**

**167 **. The complement of AB+BΜ
C+CDΜ
is **πΜ
πΜ
+ππΜ
+πΜ
ππ.**

**168 . ** The complement of AB(CΜ
D+BΜ
CΜ
) is **πΜ
πΜ
+π+πΜ
.**

**169 . ** The complement of A(B+C)(πΆ + π·) is **π¨+π©πͺ + CD.**

**170 . ** The Boolean expression (A+C+D)(B+D+C) may be simplified as **AB +C+D.**

**171 . ** The Boolean expression (AB+C+DC)(AC+BC+D) may be simplified as **AC+BC+DC+ABD.**

**172 .** The expression (ABΜ
+AΜ
B+ACΜ
)(AΜ
BΜ
+ABΜ
+AπΆ) will be simplified as** ππΜ
πΜ
+πππ.**

**173 . ** Fig. 31 represents the karmaugh map for the expression

**174 . ** In positive logic, a pulse at -3V to chassis ground will be at **0 level.**

**175 .** ** Four** inputs can be supplied to a logic gate with a fan in factor of four.

**176 .** **A free running MV** circuit is used for a clock generator.

**177 . Four** flip-flop circuits are needed to divided by 16.

**178 . ** An index register in a digital computer is used for **address modification.**

**179 . ** An index register in digital computer is register to be used for **address modification process.**

**180 . ** A toggle operation is used **with a flip-flop.**