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Posted By: bharath sudar Member Level: Platinum Posted Date: 13 May 2008

2006 Indira Gandhi National Open University (IGNOU) Post Graduate Diploma Computer Application COMPUTER FUNDAMENTAL Question paper

Course: Post Graduate Diploma Computer Application

University: Indira Gandhi National Open University (IGNOU)

. Simplify the following expression using Karnaugh map in product-of-sum form. F (A, B, C, D) - âˆ‘ (0, 2, 8, 9, 10, 11, 14, 15) Also, draw the logic circuit for the simplified exnression.
2. What is a vector instruction? Explain briefly the need of an array processor in the execution of a vector instruciion. 5
3. Construct an 8 x 1 multiplexer, using two 4 x 1 multiplexers and a decoder. Make assumptions, it required.
4. What is cache coherence? Why is it important for shared-memorym ulti-processor systems? (4)
5. Write an 8086 adsembly laflguage program to find the total number of occurrences of the characters "a" and "t" in an array of characterss tored in the memory. (5)
6. Explain, with an example, one instruction of each of the following types : (6)
7. Write a program to evaluate the following expression using an evaluation-stack architecture machine : A x B / D + E x F - G Assume that the machine contains instructions for PUSH, POP, ADD, SUBTRACT, MULTIPLY and DIVIDE (6)
8. Construct a full-adder circuit using one or more decoders. (5)
9. What is the set-associative mapping scheme for memory? Explain this with the help of a diagram.
10. Give at least three differences between each of the following : (15)
11. Give at least three differences between each of the following : (15) (i) Instruction pipeline vs Floating point pipeline (ii) Horizontal microinstruction vs Vertical microinstruction. (iii) Access methods of secondary storage vs Access methods of main memory. (iv) Loosely coupled microprocessors vs Tighily coupled microprocessors. (v) Flash memories vs. PROMs.
12. Design a single precision floating point number having the following characteristics: The base of the number is 2 The mantissa can represent at least 5 decimal digits correctly. The exponent range is 10&plusminus; 50 Make suitable assumptions if required (5)
13. Write a program in 8086 assembly language that adds two two-digit unpacked BCD numbers (5)
14. What is the purpose of data-flow machines? List at least two advantages and two disadvantages of these machines. (5)
15. Explain the role of the segment registers in 8086 microprocessors, with the help of an example for each. (6)
16. What are the basic characteristics of RISC? Explain briefly the reasons that make RISC based designs more popular. (4)
17. An 8-bit register contains the binarv value 11001011. Perform the following opnrufion, on this : (i) Mask the upper nibble of the register. (A nibble is a 4-bit sequence.) (ii) Insert a value 1101 at the upper nibble. (iii) Perform circular shift right. (iv) Perform arithmetic shift left. (v) Perform logical shift right. Make assumptions if required. (5)
18. Draw the Karnaugh map for the following function and find the optimal function in sum of products form. F(x, y, z, w) = âˆ‘ (0, 2, 7 , 8, 9, 11, 15) Also draw the logic circuit. (5)
19. What is Flynnls classification? Can you place a supercomputer in any of the categories defined by Flynn? Justify your answer. (4)
20. Write an assembly language program in 8086 to reverse a string of 8 bytes without using a stack. (5)
21. Design a 3-bit ripple counter. How is this counter different from synchronousc ounters? (5)
22. Explain each of the following instruction types with the help of an illustrative instruction: (i) shift (ii) Subroutine call and return (iii) Data transfer
23. Explain the concept of instruction pipelining, with the help of a diagram
24. An instruction is stored at location 300 with its address field at location 301. The address field has the value 400. A processor register R1 contains the number 200. Evaluate the effective address if the addressingm ode of the instruction is (5) (i) direct (ii) immediate (iir) relative (iv) register indirect (v) index with R1 as the index register
25. What is the principle of a single error correction - double error detection code ? What will the size of such a code be for 8-bit data (5)
26. List five differences amongst the following operating system configurations of multiprocessor systems : 5 * Master slave * Separate o/s for each Processor * Distributed
27. Show, with an example, how a subroutine call can be implemented by specifying a location in the subroutine for storing the return address. Also, give a scheme through which parameters can be passed during a subroutine call. (5)
28. What is interprocessosr ynchronization? How is the Mutual exclusion mechanism followed in a Multiprocessor system? (5)
29. Construct a JK flipflop using an RS flip-flop. Explain your circuit. (5)
30. How is DMA different from Programmed Input/Output ? How are devices, like the keyboard, connected to a computer? (5)
31. What are the micro-operationsre quiredf or fetching an instruction ? Does the size of instruction change the sequence of micro-operationsf or fetching the instruction ? Justify your answer. (5)
32. What are the micro-operationsre quiredf or fetching an instruction ? Does the size of instruction change the sequence of micro-operationsf or fetching the instruction ? Justify your answer. (5)
33. What are the basic requirements of an Interrupt Servicing Program ? Write the steps required for writing a memory resident Interrupt Servicing Program for the 8086 microprocessor (5)

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