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National Open University Exam Past Question – CIT 752 OCTOBER/NOVEMBER 2014 EXAMINATION

NATIONAL OPEN UNIVERSITY OF NIGERIA CIT 752 Operating systems Concept

14-16 AHMADU BELLO WAY, VICTORIA ISLAND LAGOS SCHOOL OF SCIENCE AND TECHNOLOGY

OCTOBER/NOVEMBER 214 EXAMINATION

 

 

Course code:   CIT 752

Course title:    Operating systems Concept

Instruction:   Answer any five (5) questions. Each question carries 14 marks

 

  1. a) Illustrate using a well labelled diagram only Simple Interrupt processing (8 Marks)
  2. b) Briefly discuss the steps a CPU goes through in handling an interrupt (6 Marks)

 

  1. a) Define the following:

Race condition (2 Marks) Critical regions (2 Marks) Mutual exclusion (2 Marks)

  1. b) In discussing Cooperating processes highlight any four reasons for providing an environment that allows process cooperation (4 Marks)
  2. c) List the contents of a Processing Control Block (PCB) (4 Marks)

 

  1. a) Briefly discuss an interrupt handler routine (2 Marks),
  2. b) Distinguish between a program and a process (4 marks)
  3. c) Draw a well labelled diagram of a multiple producers and consumers scenario (8

Marks)

 

  1. a) What is a Virtual machine in computer science (2 Marks)
  2. b) In no more than three sentences discuss i. Page Fault
  3. Cache Memory (4 marks)
  4. c) Briefly discuss the aim of processor scheduling. List and briefly discuss four types of scheduling (8 marks)

 

  1. a) Briefly explain three types of Operating Systems with an example each. (6 Marks)
  2. b) As a technical analyst explain:
  3. A bug
  4. A debugging process (2 Mark)
  5. c) Briefly discuss any 3 debugging techniques (6 Marks)
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  1. a) Define Operating system (2 Marks)
  2. b) List and discus three operating system functions which exists for ensuring the efficient operation of the system itself via resource sharing. (6 Marks)
  3. c) Discuss any two of the following: (6 Marks) First-Come, First-Served (FCFS)

Shortest Job First (SJF)

 

  1. a) List Three advantages and three disadvantages of demand paging (6 Marks)
  2. b) Discuss:

 

Fixed Allocation                     (4 Marks) I/O Protection                         (4 Marks)

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