Digital Electronic Circuits Interview Questions and Answers 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. Predecessor
Answer: B
Clarification: 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. In case of any arithmetic operation, if the result has less number of bits than the operands, then it is known as underflow condition.
2. An overflow is a _________
A. Hardware problem
B. Software problem
C. User input problem
D. Input Output Error
Answer: B
Clarification: An overflow is a software problem which occurs when the processor cannot handle the result properly when it produces an out of the range output.
3. An overflow occurs in _________
A. MSD position
B. LSD position
C. Middle position
D. Signed Bit
Answer: A
Clarification: An overflow occurs at the Most Significant Digit position. It occurs when the processor cannot handle the result properly when it produces an out of the range output.
4. Logic circuitry is used to detect _________
A. Underflow
B. MSD
C. Overflow
D. LSD
Answer: C
Clarification: To check the overflow logic circuitry is used in each case. Overflow occurs when the processor cannot handle the result properly when it produces an out of the range output.
5. 1’s complement can be easily obtained by using _________
A. Comparator
B. Inverter
C. Adder
D. Subtractor
Answer: B
Clarification: 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. Different Arithmetic operations are required
Answer: A
Clarification: The advantage of 2’s complement is that only one arithmetic operation is required for 2’s complement’s operation and that is only addition. Just by adding a 1 bit to 1’s complement, we get 2’s complement.
7. The 1’s complements requires _________
A. One operation
B. Two operations
C. Three operations
D. Combined Operations
Answer: A
Clarification: Only one operation is required for 1’s complement operation. This includes only inversion of 1’s to 0’s and 0’s to 1’s.
8. Which one is used for logical manipulations?
A. 2’s complement
B. 9’s complement
C. 1’s complement
D. 10’s complement
Answer: C
Clarification: For logical manipulations, 1’s complement is used, as all logical operations take place with binary numbers.
9. For arithmetic operations only _________
A. 1’s complement is used
B. 2’s complement
C. 10’s complement
D. 9’s complement
Answer: B
Clarification: Only 2’s complement is used for arithmetic operations, as it is more fast.
10. The addition of +19 and +43 results as _________ in 2’s complement system.
A. 11001010
B. 101011010
C. 00101010
D. 0111110
Answer: D
Clarification: The decimal numbers are converted to their respective binary equivalent and then the binary addition rules are applied.
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