D 70188
D 70188
FIFTH SEMESTER B.SC. DEGREE EXAMINATION, NOVEMBER 2019
(CUCBCSS-UG)
B.C.A.
BCA 5B 08-COMPUTER ORGANISATION AND ARCHITECTURE
(2017 Admissions)
Time: Three Hours Maximum: 80 Marks
Part A
Answer all questions. Each question carries 1 mark.
1. Which digital system translates coded characters into a more intelligble form?
2. In a BCD to seven segment converter, what is the use of code converter?
3. Which shift register that will accept a parallel input and can shift data left or right called?
4. In this type of counter, the complement of the output of the last stage of the shift register is
Fed back to the D input of the first state.
5. How register reference instructions are recognized by the control unit?
6. How do we implement the control logic in hardwired logic?
7. __________ contains the status information that characterizes the state of the CPU.
8. Write the reverse polish notation for the given ainfils arithmetic expression
A* B+C D+E* F.
9. How many characters can be encoded using ASCII?
10. _________ is the method transfers a large block of data between a high speed I/O
device such as a disk and memory directly without CPU.
(10 x 1 = 10 marks)
Part B
Answer all questions.
Each question carries 2 marks.
11. Draw the logic diagram of a 2-line-to-4-line decoder using NOR gates.
12. Draw the logic diagram of a four-bit binary ripple countdown counter, using flip-flops that
trigger on the negative edge of the clock.
13. What do you meant by instruction cycle? What are the four phases of instruction cycle?
14. Explain about the input output configuration with neat figure.
15. What do you mean by register stack?
16. What do you mean by Data Transfer Instructions?
17. Define hit/miss ratio..
18. What do you mean by I/O controllers?
(8 x 2 = 16 marks)
Part C
Answer any six questions.
Each question carries 4 marks.
19. Decsribe the operation of a multiplexer with necessary diagrams.
20. Construct a 16 x 1 multiplexer with two 8 x 1 and one 2 x 1 multiplexers. Use block
diagrams.
21. Explain the working of decade counter.
22. Explain about the control unit with figure.
23. Write a note on register reference instructions.
24. Explain about the priority interrupt.
25. What do you mean by data manipulation instructions?
26. Write a note on peripheral devices.
27. What do you mean by memory mapping?
(6 x 4 = 24 marks)
Part D
Answer any three questions.
Each question carries 10 marks.
28. (a) Explain the working of decoders with diagram.
(b) Draw the logic diagram of 2-to-4-line decoder using (i) NOR gates only; (ii) NAND
gates only. Include the enable input.
29. Write a note on Johnson counter.
30. Discuss about the design of accumulator logic.
31. Discuss about the processor organization.
32. Discuss about the memory organization.
(3 x 10 = 30 marks)
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