This set of Digital Electronic Circuits Interview Questions and Answers focuses on “1’s,2’s,9’s & 10’s Complements-2”.

1. If the number of bits in the sum exceeds the number of bits in each added numbers, it results in

a) Successor

b) Overflow

c) Underflow

d) None of the Mentioned

View Answer

Explanation: If the number of bits in the sum exceeds the number of bits in each added numbers, it results in overflow and is also known as excess-one.

2. An overflow is a

a) Software problem

b) Hardware problem

c) User input problem

d) None of the Mentioned

View Answer

Explanation: An overflow is a hardware problem. It is not able to show correct result because of sign changes.

3. An overflow occurs in

a) MSD position

b) LSD position

c) Middle position

d) Never occurs

View Answer

Explanation: An overflow occurs at Most Significant Digit position.

4. Logic circuitry is used to detect

a) Underflow

b) MSD

c) Overflow

d) LSD

View Answer

Explanation: To check the overflow logic circuitry is used in each case.

5. 1’s complement can be easily obtained by using

a) Comparator

b) Inverter

c) Adder

d) Subtractor

View Answer

Explanation: With the help of inverter the 1’s complement is easily obtained. Since, during the operation of 1’s complement 1 is converted into 0 and vice-versa and this is well suited for the inverter.

6. The advantage of 2’s complement system is that

a) Only one arithmetic operation is required

b) Two arithmetic operations are required

c) No arithmetic operations are required

d) None of the Mentioned

View Answer

Explanation: The advantage of 2’s complement is that only one arithmetic operation is required for 2’s complement’s operation and that is either addition or subtraction.

7. The 1’s complements requires

a) Two operations

b) One operations

c) Three operations

d) None of the Mentioned

View Answer

Explanation: Two operations are required for 1’s complement operation. These are conversion of binary numbers and addition/subtraction.

8. Which one is used for logical manipulations ?

a) 2’s complement

b) 9’s complement

c) 1’s complement

d) 10’s complement

View Answer

Explanation: For logical manipulations 1’s complement is used.

9. For arithmetic operations only

a) 1’s complement is used

b) 2’s complement

c) 3’s complement

d) 9’s complement

View Answer

Explanation: Only 2’s complement is used for arithmetic operations.

10. The addition of +19 and +43 results as _________ in 2’s complement system.

a) 11001010

b) 101011010

c) 00101010

d) 00111110

View Answer

Explanation: None.

**Sanfoundry Global Education & Learning Series – Digital Circuits.**

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