01․ The code used in digital systems to represent decimal digits, letters, and other special characters such as + , – , . , * , etc. is

Except ASCII code given remaimg codes are used for number representation only. The code used in digital systems to represent decimal digits, letters, and other special characters such as +, –, ., *, etc. is ASCII code.

02․ The codes in which each successive code word differs from the preceding one in only one bit position are called

The sequence used in k map is not in binary sequence which would be 00, 01, 10, 11. It is 00, 01, 11 10, which is Gray code or cyclic code sequence. Gray code sequence only changes one binary bit as we go from one number to the next in the sequence, unlike binary. That means that adjacent cells will only vary by one bit, or Boolean variable. This is what we need to organize the outputs of a logic function so that we may view commonality. Moreover, the column and row headings must be in Gray code order, or the map will not work as a Karnaugh map.

03․ Unit distance code is the other name of

In Gray code successive numbers will differ by only one bit. It is also known as unit distance code or cyclic code or reflective code. It is a unweighted code.

04․ (11011)

_{2}in BCD 8421 code isIn BCD there are 6 invalid BCD combinations are present with 4 bits. Using logic circuit design consider invalid BCD combinations into don't care. During BCD addition, if invalid BCD code is present then add '0110' to get correct result.

05․ (1D)

_{16}in BCD 8421 code isIn BCD there are 6 invalid BCD combinations are present with 4 bits. Using logic circuit design consider invalid BCD combinations into don't care. During BCD addition, if invalid BCD code is present then add '0110' to get correct result.

06․ (44)

_{8}in BCD 8421 code isIn BCD there are 6 invalid BCD combinations are present with 4 bits. Using logic circuit design consider invalid BCD combinations into don't care. During BCD addition, if invalid BCD code is present then add '0110' to get correct result.

07․ For a code to be self-complementing, the sum of all its weights must be

Weighted self complimented codes are
2421, 3321, 5211 and 4311.
Therfore, the sum of all its weights must be '9' for a self-complementing code.

08․ The following code is not a BCD code.

XS-3 code is obtained by adding '0011' to the BCD code. Therefore, XS-3 code is not a BCD code.

09․ The parity of the binary number 11011001 is

Parity of a binary number is even parity when the number of 1's present in the number is even otherwise odd parity.
Therefore, the given binary number is a odd parity number.

10․ 2-out-of-5 code is

A two-out-of-five code is an encoding scheme which uses five bits consisting of exactly three 0s and two 1s. This provides ten possible combinations, enough to represent the digits 0–9. This scheme can detect all single bit-errors, all odd numbered bit-errors and some even numbered bit-errors (for example the flipping of both 1-bits). However it still cannot correct for any of these errors.

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