Digital Logic - Number representation and computer arithmetic

21:   A circuit produces 1's complement of the input word, one application is binary subtraction. It is called
 A. Logic gate B. Register C. Multiplexer D. BCD convertor Answer Report Discuss Option: B Explanation : Click on Discuss to view users comments. Ravi said: (2:13am on Tuesday 6th October 2015) I think the answer is A, as 1's complement is same as NOT logic gate (which does inversion of bits). Write your comments here: '>
22:   The most commonly used character codes for transmission is
 A. EBCDIC B. ASCII C. BCD D. None of these Answer Report Discuss Option: D Explanation : Click on Discuss to view users comments. KISHAN BHURKE said: (12:52pm on Saturday 17th September 2016) I THINK ANS IS B ASCII sunday konyak said: (11:46am on Sunday 18th February 2018) The correct Answer is BCD. since BCD is the most basic and commonly used for code conversion. Write your comments here:
23:   How many different number a 6-bit binary word can represent?
 A. 63 B. 64 C. 124 D. 128 Answer Report Discuss Option: B Explanation : Click on Discuss to view users comments. Write your comments here:
24:   (r-1)'s complement of the (r-1)'s complement of an integer number is
 A. original number B. (r-2)'s complement of the number C. r's compliment D. BCD code of number Answer Report Discuss Option: A Explanation : Click on Discuss to view users comments. Write your comments here: '>
25:   The sign magnitude representative of decimal number -637 is
 A. 0687 B. 9687 C. 1687 D. 1620 Answer Report Discuss Option: B Explanation : Click on Discuss to view users comments. Write your comments here:

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