NPTEL Digital Circuits Week 5 Assignment Answers 2024
1. Which logic gate is commonly used in the design of equality detection in a binary comparator?
A) AND gate
B) OR gate
C) XNOR gate
D) NOT gate
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2. Consider a 1-bit binary comparator with inputs A and B. The comparator has three outputs: A=B,
A>B, and AB?
A) A’B
B) AB’
C) A XOR B
D) AB
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3. How many output lines does a 3-to-8 decoder have?
A) 3
B) 4
C) 8
D) 16
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4.
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5. How many 3-line-to-8 decoders are required to construct 4-line-to-16 decoders
A) 1
B) 2
C) 3
D) 4
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6. Calculate GRAY code equivalent of the binary code B; B2 B1 Bo = 1 1 1 0?
A) G3 G2 GI G0 = 1 0 0 1
B) G3 G2 GI G0 = 1 0 1 0
C) G3 G2 GI G0 = 1 0 0 0
D) G3 G2 GI G0 = 1 0 1 1
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7. Calculate BINARY equivalent of the GRAY code G3 G2 Gi Go = 0 0 1 0?
A) Вз B2 B1 B0 = 1 1 1 0
B) Вз B2 B1 B0 = 1 1 0 0
C) Вз B2 B1 B0 = 0 0 1 1
D) B3 B2 B1 B0 = 0010
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8. What is the primary function of a decoder in digital circuits?
4) To store data
B) To encode data
C) To convert binary information from ‘n’ input lines to a maximum of 2n unique outputs
D) To perform arithmetic operations
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9. How does a priority encoder resolve conflicts when multiple inputs are active?
A) It sums all inputs together
B) It encodes the input with the lowest binary value
C) It encodes the input with the highest priority
D) It randomly selects an input to encode
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10.
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11.
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12.
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13.
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14. What is the primary function of a multiplexer?
A) To encode data
B) To select one input from multiple inputs
C) To decode data
D) To store data
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15. How many select lines are needed for an 8×1 multiplexer?
A) 2
B) 3
C) 4
D) 8
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