Operating Systems Examination 2008-09: Operating Systems Fundamentals, Exams of Computer Science

Download Operating Systems Examination 2008-09: Operating Systems Fundamentals and more Exams Computer Science in PDF only on Docsity! Page 1 of 4 CORK INSTITUTE OF TECHNOLOGY INSTITIÚID TEICNEOLAÍOCHTA CHORCAÍ Semester 2 Examinations 2008/09 Module Title: Operating Systems Fundamentals Module Code: SOFT6003 School: Science Programme Title: B.Sc. (Honours) in Software Development and Computer Networking Higher Certificate in Science in Information Technology Support Programme Code: KDNET_8_Y1 KITSU_6_Y1 External Examiner(s): Mr. J. Greenslade Internal Examiner(s): Mr. G. MacSweeney Instructions: Answer four questions. Show all work. Duration: 2 hours Sitting: Summer 2009 Requirements for this examination: Note to Candidates: Please check the Programme Title and the Module Title to ensure that you have received the correct examination paper. If in doubt please contact an Invigilator. Page 2 of 4 Q1. (a) Name four registers which one would expect to find in a typical central processing unit. (4 Marks) (b) In the central processing unit, what is the purpose of the clock? (2 Marks) (c) With reference to the fetch-execute cycle, what is the purpose of an interrupt? Distinguish between sequence interrupts and nested interrupts. (4 Marks) (d) UNIX and Windows are examples of operating systems. Name two others. (2 Marks) (e) In UNIX, what is the purpose of the shell? Name two shells. (4 Marks) (f) Apart from normal completion, suggest five reasons why a process might be terminated. (5 Marks) (g) What is a suspended state? Name two suspended states. (4 Marks) Q2. (a) Describe the main characteristics of the following short-term scheduling algorithms: (i) Shortest Process Next (ii) Shortest Remaining Time (iii) Multilevel Feedback (7 Marks) (b) Consider the following set of processes with arrival times and service times given in milliseconds. Process Name Arrival Time Service Time A 0 3 B 1 9 C 4 1 D 8 7 E 12 5