# Sample Paper on Digital Electronics.

May 18 • General • 1911 Views • 3 Comments on Sample Paper on Digital Electronics.

Sample Paper on Digital Electronics

Paper-ECE411(E)

NOTE:- Attempt any five questions. Atleast one from Each unit.

Section – A

1. (a) Define ‘Universal gates‘ and why they are called universal gates?                                    7

(b) Convert the given hexadecimal numbers into its equivalent B.C.D number and octal number:

(i)5a6bH      (ii) 2cd51H     (iii)0a14dH                                                                               6

(c) What are the similarities between X-OR gate and X-NOR gates? Explain with truth table and                       logic diagram.                                                                                                                                  7

2. Describe the steps involved in reducing the expression by using “karnaugh map” and solve the given expression by using Q-map method with its logic circuit:  F(A, B, C, D) = AD+C’+DB            20

Section – B

3. (a). What do u mean by “MUX”? Implement the 4:16 MUX and what will be the output of mux if we connect the select lines with logic”1011″?                                                                                  10

(b). Develop a asynchronous 3 bit up/down counter with its grey code configuration.             10

4.  (a). Why we use Decoder? In what terms it relates with MUX? Describe the functioning of 3*8 line decoder with its logical diagram.                                                                                                      10

(b) Describe the working of Master Slave J-K flip flop and explain the Race Around condition. 10

Section – C

5. Explain the different logic families with their characteristics. Draw the DTL logic circuit and explain the term Totem Pole.                                                                                                                     20

6. Define the terms: Fan-In and Fan-Out and What will be the change in Fan-Out if we insert a more diode in series in a DTL circuit?                                                                                             20

Section – D

7. (a) Design a R-2R ladder digital to analog converter and explain its working.                             10

(b)What do u mean by Sample and Hold circuit? Suggest its practical implementation.          10

8. Write a brief note on two of the following:                                                                                    20

(a) FPGA.

(b) Successive approximation ADC.

(c) CPLD.

### 3 Responses to Sample Paper on Digital Electronics.

1. suriya prakash says:

We had moved from analog to digital many years ago and currently using digital technologies. This article teaches the basics of digital electronics..

2. Rachita Mishra says:

Here the sample paper of digital ckt is given. Digital electronics, or digital (electronic) circuits, represent signals by discrete bands of analog levels, rather than by a continuous range. All levels within a band represent the same signal state. Relatively small changes to the analog signal levels due to manufacturing tolerance, signal attenuation or parasitic noise do not leave the discrete envelope, and as a result are ignored by signal state sensing circuitry.

3. priyanka nayak says:

Today’s modern electronic devices contains an micro controller. An micro controller is a processor used in embedded systems.
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