Digital Circuits Week 5 Nptel Assignment Answers
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Digital Circuits Week 5 Nptel Assignment Answers (July-Dec 2024)
Q1.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
Answer: C) XNOR gate
Q2. Consider a 1-bit binary comparator with inputs A and B. The comparator has three outputs: A=B,
A>B. and A<B. Which of the following Boolean expressions correctly represents the output for |
ASB?
A) AB
B) AB
C) AXORB
D) AB
Answer: B) AB
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These are Digital Circuits Week 5 Nptel Assignment Answers
Q3.How many output lines does a 3-to-8 decoder have?
A) 3
B) 4
C) 8
D) 16
Answer: C) 8
Q4 ‘Which of the following statement is TRUE?
A) A and B represent Sum and Carry of Half adder respectively
B) A and B represent Sum and Carry of full Adder respectively
C) A and B represent Carry and Sum of Full adder respectively
D) A and B represent Carry and Sum of half adder respectively
Answer: C) A and B represent Carry and Sum of Full adder respectively
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These are Digital Circuits Week 5 Nptel Assignment Answers
Q5.How many 3-line-to-8 decoders are required to construct 4-line-to-16 decoders
A 1
B) 2
C) 3
D) 4
Answer: B) 2
Q6 Calculate GRAY code equivalent of the binary code Bs Bx Bi Bo=1110?
A) G3G21G1Go=1001
B) G3G2G1Go=1010
€) G3G2G1Go=1000
D) G3G21G1Go=1011
Answer : A) G3G21G1Go=1001
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These are Digital Circuits Week 5 Nptel Assignment Answers
Q7. Calculate BINARY equivalent of the GRAY code G3 G2 G1 Go=0010?
A) B3B2B1Bo=1110
B) B3B2B1Bo=1100
C) B3B2B1Bo=0011
D) B3BaB1Bo=0010
Answer: C) B3B2B1Bo=0011
Q8. What is the primary function of a decoder in digital circuits?
A) To store data
B) To encode data
c) To convert binary information from ‘n’ input lines to a maximum of 2″ unique outputs
D) To perform arithmetic operations
Answer: c) To convert binary information from ‘n’ input lines to a maximum of 2″ unique outputs
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These are Digital Circuits Week 5 Nptel Assignment Answers
Q9. 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
Answer: c) It encodes the input with the highest priority
Q10.‘What 1s the output Y for given 2X1 multiplexer?
A) 0
B) 1
c)y
D)y’
Answer: B) 1
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These are Digital Circuits Week 5 Nptel Assignment Answers
Q11.‘What is the output expression F for the following configuration?
A) F=xandy
B) F=x xor y
C) F=x+y
D) F=x xnor y
Answer : B) F=x xor y
Q12.Which input values I, Ir. Io. and Is of a 2×1 multiplexer will produce an output F equal to the
expression F=x.y?
a.
b.
c.
d.
Answer d.
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These are Digital Circuits Week 5 Nptel Assignment Answers
Q13. Find the output expression F. for the following circuit?
A) x’y’z+x’yz+xy’z+xyz’
B) x’y’z+xy’z+x’yz+xy’z’
C) x’y’z+x’yz+xy’z +xy’z
D) x’y’z’ +x’yz’ + xyz’ + xyz
Answer: B) x’y’z+xy’z+x’yz+xy’z’
Q14. 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
Answer: B) To select one input from multiple inputs
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Q15.‘How many select lines are needed for an 8×1 multiplexer?
A)2
B) 3
C) 4
D) 8
Answer: B) 3
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These are Digital Circuits Week 5 Nptel Assignment Answers
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