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Digital Electronics DE 3rd Sem/IT/CSE/0620/Feb 2021 Diploma Paper

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Digital Electronics DE 3rd Sem/IT/CSE/0620/Feb 2021 Diploma Paper

                              SECTION-A

Q2. Attempt any Three questions.                                                                    5×6=3

i. Define Propagation delay, Bit rate and Power dissipation.
ii. What is De-multiplexer? Draw the logic diagram of 4:1 De-multiplexer.
iii. Draw and explain half Subtractor circuit.
iv. Explain the De-Morgan’s theorems with the help of suitable example.
v. Draw the symbol, Boolean expression and truth table for NAND gate.
vi. What is encoder? Draw the logic circuit of decimal to BCD encoder.
vii. Convert the following
a) (.625)10 = (?)2 b) (100.111)2 = (?)10 c) (FF4D) 16 = (?)2

                                   SECTION-C

Q3. Attempt any one question.                                                      1×10=10

a. Draw a K-map to reduce the function. Realize the reduced function by using NAND gates only.
Y = Σm (0,1,4,5,3,2,11,10).
b. Discus the OR, NOR, EX-NOR gate with their symbols, Boolean expression and truth table.
c. What is decoder? Explain the functioning of a 2 to 4 line decoder with the help of a circuit diagram and
truth table.
d. Explain A to D conversion with the help of a dual type of ADC.

Propagation delay, Bit rate and Power dissipation.

Multiplexer

Draw the logic diagram of 4:1 De-multiplexer.

De-Morgan’s theorems with the help of suitable example.

Symbol, Boolean expression and truth table for NAND gate.

Encoder

Draw the logic circuit of decimal to BCD encoder.

 Convert 
a) (.625)10 = (?)2 b) (100.111)2 = (?)10 c) (FF4D) 16 = (?)2

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Digital Electronics DE 3rd Sem/IT/CSE/0620/Feb 2021 Diploma Paper Click Here

Digital Electronics DE 3rd Sem/IT/CSE/0620/Feb 2021 Diploma Paper

K-map to reduce the function. Realize the reduced function by using NAND gates only.
Y = Σm (0,1,4,5,3,2,11,10).

OR, NOR, EX-NOR gate with their symbols, Boolean expression and truth table.

Decoder

functioning of a 2 to 4 line decoder with the help of a circuit diagram and
truth table.

A to D conversion with the help of a dual type of ADC.

Digital Electronics DE 3rd Sem/IT/CSE/0620/Feb 2021 Diploma Paper
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