Digital circuits question paper solution 2022

Digital circuit 2022 question paper solution Bihar engineering university previous year question solution . Here we have have provided Digital circuit ECE branch question paper solution.

(a) Convert the given decimal numbers to their binary equivalent:
108-364, 268-025

(b) Perform BCD addition of (23) BCD+ (20) BCD
(i) 00110100
(ii) 01000011
(iii) 10011
(iv) 11100

(c) Which operation is shown in the following expression? (X+Y’) (X+Z) (Z’ + Y’)
(i) NOR
(ii) SOP
(iii) ExOR
(iv) POS

(d) The maxterm when X = Y =Z=1 is
(i) x’+y+z‘
(ii) xyz
(iii) x’y’z’
(iv) x+y+z

(h) Which of the following combinations of logic gate can decode binary 1101?
(i) One 4-input AND gate
(ii) One 4-input AND gate, one inverter
(iii) One 4-input AND gate, one OR gate
(iv) One 4-input NAND gate, one inverter

(i) In digital logic, a counter is a device which
(i) counts the number of outputs
(ii) stores the number of times a particular event or process has occurred
iii) Stores the number of times a clock pulse rises and falls
iv) Counts the number of inputs

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2. (a) Find the minimized logic function using K-maps and realize using NAND and NOR gate : F(A, B, C, D) = 2m(1, 3, 5, 8, 9, 11, 15) Σd(2, 13)

(b) Show that if all the gates in a two-level OR-AND gate network are replaced by NOR gate, the output function does not change.

3. (a) Convert a two-to-four line decoder with enable input to 1:4 demultiplexer.

4. (a) Construct a 4-bit down counter using logic gates.

(b) Model a synchronous MOD-6 counter and explain with waveforms.

5.Design a J-K counter that goes through states 3, 4, 6, 7 and 3. Is the counter self- starting? Modify the circuit such that whenever it goes to an invalid state it comes bact to state 3.

6. (a) Assess a circuit with primary inputs A and B to give an output Z equal to 1 when A becomes 1 if B is already 1. Once Z= 1 it will remain so until A goes to 0. Draw timing diagram, state diagram, primitive flow table for designing the circuit.

7. Examine the structure of ECL and TTL. Also outline the tri-state inverter configuration with neat diagram.

7(b) . Design a comparator to check if two n-bit numbers are equal. Configure this using cascaded stages of 1-bit comparator.

(B)Compare synchronous and asynchronous counters.

8. A staircase light is controlled by two switches, one is at the top of the stairs and the other is at the bottom of the stairs.

(a) Make a truth table for this system.

(b) Write the logic function in SOP form.

(c) Realize the circuit using AOI logic.

(d) Realize the circuit using minimum number of NAND and NOR gates.

  1. Write short notes on any two of the following:
    (a) CMOS inverters
    (b) Monostable multivibrators
    (c) Digital to analog converters

BEU DIGITAL CIRCUIT 2022 PYQ SOLUTION = DOWNLOAD

BEU digital circuit 2022 question paper= DOWNLOAD

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