Here is quick quiz for Parallel Binary Adders to test your concepts.

  1. A parallel binary adder is a digital circuit that performs addition on
    1. Decimal numbers
    2. Hexadecimal numbers
    3. Octal numbers
    4. Binary numbers
  2. A half-adder circuit has … inputs and … outputs.
    1. 3,2
    2. 2,2
  3. A and B are the two inputs of a half-adder circuit. The sum output is given as
    1. A XOR B
    2. A.B’ + A’.B
    3. both a and b
  4. The half adder carry output is given by the following Boolean expression
    1. (A.B)’
    2. A.B
    3. ((A.B)’)’
    4. Both b and c
  5. 1-bit half adder accepts two binary digits A and B at its input. The bit width of each input is
    1. 2-bit
    2. 3-bit
    3. 1-bit
  6. The biggest drawback of a half-adder circuit is that:
    1. Accept carry from the previous states
    2. It can not generate carry
    3. Accept carry from the next stage
  7. A digital circuit that performs the arithmetic addition on two binary numbers is:
    1. subtractors
    2. Multipliers
    3. Adders
    4. Comparators
  8. In a half-adder circuit, having two inputs A=1 and B=1, what will be the sum and carry output?
    1. Sum=1, carry=1
    2. Sum=0, carry=0
    3. Sum=0, carry=1
    4. Sum=1, carry=0
  9. How many two-input NAND gates are required to implement a half-adder using NAND logic?
    1. 4
    2. 5
    3. 6
  10. How many two-input NOR gates are required to implement a half-adder circuit using NOR logic?
    1. 4
    2. 5
    3. 6
  11. A binary full adder performs addition on
    1. 2 bits
    2. 3 bits
    3. 4 bits
  12. A full adder can perform addition on … bits at a time.
    1. 1
    2. 2
    3. 3
  13. Sum=A XOR B is equal to
    1. A’.B’ + A.B
    2. A’.B + A.B’
    3. A’.B’ + A’.B
  14. If A, B and C are the inputs of a full adder then the sum equation of a full adder is …
    1. A NOT B NOT C
    2. A XOR B XOR C
    3. A OR B OR C
  15. To design a full adder circuit the number of XOR gates, AND gates and OR gates required are:
    1. 2, 2, 1
    2. 1, 2, 2
    3. 2, 1, 2

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