ICT2632_May_June2020.PDF - UNIVERSITY EXAMINATIONS May\/June 2020 ICT2632 DIGITAL LOGIC 100 Marks 2 Hours Instructions This question paper consists of 3

ICT2632_May_June2020.PDF - UNIVERSITY EXAMINATIONS May/June...

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UNIVERSITY EXAMINATIONS May/June 2020 ICT2632 DIGITAL LOGIC 100 Marks 2 Hours Instructions: This question paper consists of 3 pages. Examination is for 100 marks. Answer all questions. Closed book Examination. Number your answers and label your rough work clearly. The mark for every question appears in brackets next to the question Student should do Honesty Declaration. Use of Non programmable pocket calculator is permissible. EXAMINATION PANEL: First examiner : Mrs S Vallabhapurapu External examiner : Prof Hein Venter (University of Pretoria) [TURN OVER]
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2 ICT2632 May/June 2020 QUESTION 1 [40] 1.1 Convert Binary 1100.11 to Decimal. (6) 1.2 Convert 753 8 to Hexadecimal. (6) 1.3 Using Boolean algebra techniques, simplify the following expression. (6) AB ̅ ̅ ( A ̅ ̅ +B)( B ̅ ̅ +B) +AB+B A ̅ ̅ 1.4 Determine the 2’s complement of 1111001 (3) 1.5 Perform the following additions: (a) 247 8 +735 8 (4) (b) 1111 + 1101 (4) (c) 8AB 16 + B78 16 (4) 1.6 Write the expression in sigma notation: X (ABCD) = ABC ̅ ̅ D ̅ ̅ + AB ̅ ̅ CD + A ̅ ̅ B C D ̅ ̅ + A ̅ ̅ B ̅ ̅ C D ̅ ̅ + AB ̅ ̅ C ̅ ̅ D ̅ ̅ (5) 1.7
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