Parallel Binary Adders (MCQs)

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