Download GTU BE/B.Tech 2019 Winter 3rd Sem New 2131004 Digital Electronics Question Paper

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GUJARAT TECHNOLOGICAL UNIVERSITY
BE - SEMESTER- III (New) EXAMINATION — WINTER 2019

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Instructions:

1. Attempt all questions.

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2. Make suitable assumptions wherever necessary.
3. Figures to the right indicate full marks.

MARKS

Q.1 (a) Answer the following Questions: 03

1. Find 2’s Complement Representation of (-52)₁₀ .

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2. Convert the binary number (1101110.0110) to decimal.
3. For a given logic circuit, if A=B=1, and C=D=0. Find output Y.

(b) Minimize the following Boolean expression using Karnaugh Map (K-MAP) and Draw the draw the simplified logic circuit diagram. 04
Y=?m(0,1,5,9,13,14,15) + d(3,4,7,10,11)

(c) Explain full subtractor and construct full subtractor using half subtractors. 07

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Q.2 (a) Define Following Terms. 03

1. Nibble
2. Negative Logic
3. Even Parity

(b) Implement 16 X 1 multiplexer using 2 X 1 multiplexer. 04

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(c) With a neat block diagram explain the function of encoder. Explain priority encoder? 07

OR

(c) Design a combinational logic-circuit such that output is high, when four bit binary number is greater-than (0110). 07

Q.3 (a) Design 3-bit Binary to Gray code Converter. 03

(b) Explain 3-bit synchronous Binary Up counter with timing diagram. 04

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(c) Explain T Flipflop with Excitation Table. Implement T flip flop using SR flip flop. 07

OR

Q.3 (a) Distinguish between combinational and Sequential logic circuits. 03

(b) Draw and Explain 4-bit bidirectional Shift Register. 04

(c) Differentiate the Asynchronous counter and Synchronous counter. 07

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Q.4 (a) State the advantages of Finite State Machine. 03

(b) Which are the various problems of Asynchronous Circuits? 04

Q.4 (a) Define State Table and State Diagram. 03

(b) Describe General State Machine Architecture with suitable diagrams. 04

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(c) Explain the Fundamental Mode Model of ASM with Suitable example. 07

Q.5 (a) Compare the Following in every aspect: TTL and CMOS 03

(b) Explain oscillation problem of an asynchronous state machines with the help of one example. 04

(c) Write short note on Programmable Logic Arrays. 07

OR

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Q.5 (a) Define following terms with respect to Finite State Machine. 03

1. Melay machine
2. Moore machine.

(b) Draw and explain the working operation of 2- INPUT TTL NAND gate. 04

(c) Compare ROM, PLA and PAL. 07

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