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21. A circuit produces 1's complement of the input word, one application is binary subtraction. It is called
Logic gate
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Multiplexer
BCD convertor
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22. The most commonly used character codes for transmission is
EBCDIC
ASCII
BCD
None of these
23. How many different number a 6-bit binary word can represent?
63
64
124
128
24. (r-1)'s complement of the (r-1)'s complement of an integer number is
original number
(r-2)'s complement of the number
r's compliment
BCD code of number
25. The sign magnitude representative of decimal number -637 is
0687
9687
1687
1620
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