NATIONAL OPEN UNIVERSITY OF NIGERIA
14/16 AHMADU BELLO WAY, VICTORIA ISLAND, LAGOS
SCHOOL OF SCIENCE AND TECHNOLOGY
MARCH/APRIL 2014 EXAMINATION
COURSE CODE: CIT 752
COURSE TITLE: OPERATING SYSTEM CONCEPT
TIME ALLOWED: 2 ½ HOURS
INSTRUCTION: ANSWER ANY FIVE (5) QUESTIONS. EACH QUESTION CARRIES 14MARKS.
1. (a.) Distinguish between a program and a process (4 Marks)
(b.) List four different types of system calls and their purposes (10 Marks)
2. (a.) During a process execution, a change of state occurs. Using a diagram, illustrate and describe each of these states (10 Marks)
(b.) Differentiate between preemptive scheduling and non-preemptive scheduling (4 marks)
3. (a.) Define thrashing and state three main causes why thrashing occurs (6 Marks)
(b.) Briefly discuss the following
Programmed I/O (4 Marks)
Interrupt-Driven I/O (4 Marks)
4. As an analyst your attention is drawn to a situation in which a set of two or more processes are waiting for other members of the set to complete an operation in order to proceed, but none of the members is able to proceed. You are able to resolve it and return operation to normal. You are now expected to write a technical report explaining the situation which occurred stating the conditions which lead to the situation. Also state ways in which such situations are handled technically. (14 Marks)
5. (a.) List the redefined problem of Process Management and briefly explain the procedures an operating system would employ to take care of the situation (8 Marks)
(b.) There are three main memory partition selection algorithms. Briefly list and discuss the three (6 Marks)
6. (a.) Using a well labelled diagram ONLY, illustrate the multiple producers and consumers scenario (8 Marks)
(b.) A request for a page that is not available in the main memory occurred. What is the technical name for this scenario outline the process by which this is handled by the operating system. (6 Marks)
7. (a.) Write a short note on the following Page replacement algorithm for multiple process
· Page-Fault Frequency (PFF) (4 Marks)
· Working Set (4 Marks)
(b.) Write a technical note on Translation Lookaside buffer (6 marks)
For the 2015 – till date past questions for this course CLICK HERE
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