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Computer-Organization
October 14, 2023
UGC NET CS 2006 June-Paper-2
October 14, 2023
Computer-Organization
October 14, 2023
UGC NET CS 2006 June-Paper-2
October 14, 2023

Digital-Logic-Design

Question 525
An example of a self complementing code is :
A
8421 code
B
Gray code
C
Excess-3 code
D
7421 code
Question 525 Explanation: 
→ Excess-3 code is also called Self-Complementing Code. Because 1’s complement of excess-3 number is equivalent to 9’s complement of corresponding decimal digit.
→ In excess-3 code, each of the 4-bit number represents decimal digit which is 3 less than actual decimal digit. So the bits have no fixed weight.
→ Excess-3 code is ​ neither​ CRC ​ nor​ Algebraic Code which are used for error detection and/or correction.
Correct Answer: C
Question 525 Explanation: 
→ Excess-3 code is also called Self-Complementing Code. Because 1’s complement of excess-3 number is equivalent to 9’s complement of corresponding decimal digit.
→ In excess-3 code, each of the 4-bit number represents decimal digit which is 3 less than actual decimal digit. So the bits have no fixed weight.
→ Excess-3 code is ​ neither​ CRC ​ nor​ Algebraic Code which are used for error detection and/or correction.
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