Digital Electronics - Special Examination - 2023

2023•Semester 2•Civil-CA•End Semester
Bihar Engineering University, Patna
Special Examination - 2023

Digital Electronics

Time: 03 HoursCode: 100403Full Marks: 70

Instructions:

  1. The marks are indicated in the right-hand margin.
  2. There are NINE questions in this paper.
  3. Attempt FIVE questions in all.
  4. Question No. 1 is compulsory.
Q.1 Answer any seven question only:[14]

  1. Define Dynamic RAM.

  2. The resolution of a 10-bit AD converter for an input range of 10 V is approximately _________

  3. The parameter through which 16 distinct values can be represented is known as _________

  4. Define Multiplexing.

  5. Write the significance of Truth table.

  6. Write the differences between Combinational and Sequential circuit.

  7. A hexadecimal odometer displays F52F. The next reading will be _________

  8. The basic property of Sequential circuit is _________

  9. How many entries will be in the truth table of a 4-input NAND gate?

  10. What is Dual Slope ADC?

Q.2 Solve this question :[14]

  1. What are weighted, non-weighted, cyclic and self-complementary codes? Explain each with examples.

Q.3 Solve this question :[14]

  1. Design a BCD to 7-segment display decoder circuit using logic gates.

Q.4 Solve this question :[14]

  1. Design a 3-bit parallel comparator A/D convertor that provides output in 2's complement format.

Q.5 Solve both questions :[14]

  1. Design full adder using 8:1 mux.

  2. Design full adder using 4:1 mux.

Q.6 Solve this question :[14]

  1. What is binary shift register? Write down their application.

Q.7 Solve this question :[14]

  1. Minimize the following expression using k-map
    \( f(P,Q,R,S) = \Sigma m(0,1,4,5,7,12,13) \)

Q.8 Solve this question :[14]

  1. Describe the procedure to design Mod-6 counter.

Q.9 Write short notes on any two of the following:[14]
    • RAM
    • ROM
    • CMOS logic
    • Operation of TTL logic circuit working as NAND Gate