R.G.P.V. Bhopal (MP)
B.E. (4th Semester) EXAM, JUNE-2010
DIGITAL ELECTRONICS [ EC-403(N) ]
Time:3 Hrs Max Marks:100 Min Marks:35
Note:- Attempt any five question .All questions carry equal marks.UNIT-I
Q.1.(a) Describe the weighted and non-weighted codes? 10
(b) Do the following as directed: 10
(i) (235)7 = (?) 8 = (?) BCD
(ii) (235) BCD + (432) BCD in Ex-3
(ii) (235) BCD + (432) BCD in Ex-3
OR
Q.2.(a) Explain the Error detecting and Error-correcting codes with the suitable example? 10
(b).Minimize the following expression using K-Map and realize with NAND gates? 10
F(A,B,C,D)=? m(2,3,6,7,8,9,10,11,12,13,14,15)
UNIT-II
Q.3.(a)Explain the working of Modulo-5 counter with state diagram and truth table? 10
(b) Draw and explain the BCD adder circuits? 10
OR
Q.4.(a)Convert JK Flip-Flop to SR and SR to JK Flip-Flop? 10
(b)Explain the Operation of look ahead carry generator? 10
UNIT-III
Q.5.(a)Write short notes on Astable multivibrator using transistor? 10
(b)Draw the circuit of TTL with totem-pole output and verify that it performs NAND operation?10
OR
Q.6.(a)Write short notes on bistable multivibrator using transistors? 10
(b)Write short notes on MOS logic family?also explain PMOS,NMOS,and CMOS? 10
UNIT-IV
Q.7(a).Expalin the working of Master-slave JK Flip-Flop? 10
(b)Write short notes on semiconductor memories? 10
OR
Q.8(a)Write short notes on(any two) each 5
(i). PLAs
(ii) PALs
(iii) EEPROM
(iv) Multipxer Tree
(ii) PALs
(iii) EEPROM
(iv) Multipxer Tree
(b)Design the circuit using 4:1 multiplexer? 10
F(A,B,C,D)= ?m (0,2,4.,56,8,,9,11,12,13,14)
UNIT-V
Q.9.(a).Write short notes on edged triggered SR-flip flop ? 10
(b) Differantiate between latch and flip-flop? 10
OR
Q.10 (a).Write short notes on? 10
(i) Fan-In-Fan-Out
(ii) Noise Margin
(iii) Speed of Operation
(iv) Power dissipation
(ii) Noise Margin
(iii) Speed of Operation
(iv) Power dissipation
(b) Explain the working of CMOS NAND and CMOS-NOR ? 10
0 comments