Digital Arithmetic Operations and Circuits Questions and Answers

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Q21
The range of positive numbers when using an eight-bit two's-complement system is:
  • A 0 to 64
  • B 0 to 100
  • C 0 to 127
  • D 0 to 256
Answer: Option C
Q22
What are the two types of basic adder circuits?
  • A sum and carry
  • B half-adder and full-adder
  • C asynchronous and synchronous
  • D one- and two's-complement
Answer: Option B
Q23
A half-adder circuit would normally be used each time a carry input is required in an added circuit.
  • A TRUE
  • B FALSE
Answer: Option B
Q24
If B[7..0] = 10100101, what is the value of B[6..2]?
  • A 10100
  • B 01001
  • C 10010
  • D 00101
Answer: Option B
Q25
How many inputs must a full-adder have?
  • A 4
  • B 2
  • C 5
  • D 3
Answer: Option D
Q26
Determine the two's-complement of each binary number. 00110        00011        11101
  • A 11001 11100 00010
  • B 00111 00010 00010
  • C 00110 00011 11101
  • D 11010 11101 00011
Answer: Option D
Q27
Solve this binary problem: 01110010 – 01001000 =
  • A 00011010
  • B 00101010
  • C 01110010
  • D 00111100
Answer: Option B
Q28
What distinguishes the look-ahead-carry adder?
  • A It is slower than the ripple-carry adder.
  • B It is easier to implement logically than a full adder.
  • C It is faster than a ripple-carry adder.
  • D It requires advance knowledge of the final answer.
Answer: Option C
Q29
Half-adders can be combined to form a full-adder with no additional gates.
  • A TRUE
  • B FALSE
Answer: Option B
Q30
Perform the following hex subtraction: ACE16 – 99916 =
  • A 23516
  • B 13516
  • C 03516
  • D 33516
Answer: Option B

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