21222 3 Hours / 70 Marks Digital Logic Design Summer 2022 Exam Paper PDF

22320 21222 3 Hours / 70 Marks Seat No. 15 minutes extra for each hour Instructions – (1) All Questions are Compulsory. (2) Answer each next main Question on a new page. (3) Illustrate your answers with neat sketches wherev...

22320 21222 3 Hours / 70 Marks Seat No. 15 minutes extra for each hour Instructions – (1) All Questions are Compulsory. (2) Answer each next main Question on a new page. (3) Illustrate your answers with neat sketches wherever necessary. (4) Figures to the right indicate full marks. (5) Assume suitable data, if necessary. (6) Mobile Phone, Pager and any other Electronic Communication devices are not permissible in Examination Hall. Marks 1. Attempt any five of the following: 10 a) Convert (1101011)2 = (    )16 and (1111011)2 = (    )8 b) List triggering methods used for triggering flip flops. c) Define Minterm and Maxterm w.r.t. K-map. d) Define shift register and list its types. e) List any two specifications of IC-DAC 0808. f) Draw logical circuit diagram of half adder circuit. g) Write truth table of D type flip-flop. P.T.O. 22320 Marks 2. Attempt any three of the following: 12 a) Convert (43)10 = (BCD) (34)10 = (Excess-3) (110111)2 = (Gray) (11101)2 = (2’s complement) b) Draw logical diagram of full adder using K-map simplification and write truth table. c) Draw the block diagram of programmable logic Array with proper labels. d) Draw the circuit diagram of BCD to 7 - segment decoder and write truth table. 3. Attempt any three of the following: 12 a) State and prove two De-Morgan’s Theorems. b) Draw basic gates AND, OR and NOT using NAND gate only. c) Draw 4 bit ring counter with truth table and its waveform. d) Compare the following: (Any two points each) (i) Volatile - Non volatile memory (ii) SRAM - DRAM memory 4. Attempt any three of the following: 12 a) Realize given boolean expression using basic gates and simplify same. y = AB + BC (B + C) b) Design 4 bit binary to gray code converter. Using truth table. c) Realize given expression using K-map f (A, B, C, D = Σ m (3, 5, 7, 8, 10, 11, 12, 13) d) Draw JK master slave flip flop and explain its operations. e) Calculate analog o/p of 4 bit DAC for digital input is 1100. Assume VFS = 5 V 22320 Marks 5. Attempt any two of the following: 12 a) Draw and explain operation 4 bit universal shift register. Draw necessary waveforms. b) Draw block diagram of Dual slope ADC and explain its working. c) Subtract following using Two’s complement method. (15)10 – (32)10 6. Attempt any two of the following: 12 a) Design MOD-12 ripple counter. Write its truth table with waveform. b) Design 16:1 MUX using 4:1 MUX. c) Compare TTL and CMOS with following points. (i) Fan IN (ii) FAN OUT (iii) Propogation delay (iv) Power dissipation