### Digital Electronics Objectives Part 11

**201 . ** The pulse width of the wave form shown is** 5 ms**

**202 . ** The pulse interval is **5 ms.**

**203 .** When the input to a seven-segment decoder is 0100, the number on display will be** 4.**

**204 . ** The half adder circuit in Fig. 35 has input AB =11. The logic levels of the S and C output will be **S=0, C=0.**

**205 . ** The following signals are the inputs of a 7480 full adder circuit** Σ = 1 𝚺=𝟏 **Ac = BC = 1 A* = B* = 1 A1 = 1 A2 = 1 B1 = 1 B2 = 1 Ci =0

**Question 206 to 208 refer to Fig. 36.**

The astablemultivibrator shown in Fig. 36 has R1=300 Ω and C1 =5000 pF.

**206 . ** The pulse width is **1 microsecond**

**207 . ** The pulse interval is **1 microsecond.**

**208 . ** Frequency of the square wave at output is **500 Hz.**

**209 . ** In the above circuit if R1=500 ohm and C1=0.3 μF, the=pulse width will be **10.4 μs.**

**210 . ** The pulse interval will be **10.4 μs.**

**211 . ** The frequency will be** 48.1 kHz.**

**212 .** F = AB̅C+AB̅C̅+ABC when simplified is** F = AC + A𝑩.**

**213 .** The expression F = A̅B̅+A̅B can be simplified to **F = 𝑨.**

**214 . ** Using Boolean algebra, the expression F = A𝐵CD + ABCD can be simplified to **F = ACD.**

**215 .** Using Boolean algebra, the expression F = A̅BC+ABC̅+ABC can be simplified to **F = AB+BC.**

**216 . ** Using Boolean algebra, the expression F= (A+B+C+D)(A+B+𝐶+D)(𝐴+B+C+D) can be simplified as **B+D+AC.**

**217** . Decimal number 84 in BCD code is **10000100BCD.**

**218 .** The decimal value for the BCD coded number 00010010 is **12.**

**219 .** Decimal 42 in XS-3 code is **01110101.**

**220 .** Decimal number 937 in gray code is written as **110 100 100 100.**