UNIVERSITY EXAMINATIONS: 2019/2020
EXAMINATION FOR THE DIPLOMA IN BUSINESS INFORMATION
TECHNOLOGY
DBIT 403: COMPUTER OPERATING SYSTEMS
DATE: MAY, 2020 TIME: 6 HOURS
INSTRUCTIONS: Answer ALL Questions
SECTION B: 20 MARKS
A. Argue the case for or against the shift from the use of NTFS file system to FAT file
system [6 Marks]
B. Explain how monitors are used in inter-process communication [4 Marks]
C. Discuss three ways of dealing with a deadlocked condition [6 Marks]
Discuss various system threats to Operating System [4 Marks]
SECTION C: 20 MARKS
A. Discuss five resources managed by system software’s [5 Marks]
B. Explain why it is necessary to store recently used data e.g. recently referenced pages in
cache memory [4 Marks]
C. Explain three factors that determine the choice of a processor scheduling technique
[6 Marks]
D. A system has four processes namely P1, P2, P3, P4 and three types of dedicated resources
namely R1, R2, R3.
Process P1 holds one unit of R1 and request one unit of R2
Process P2 holds two units of R2 and requests two units of R1 and request one unit of
R3 and unit of R3
Process P3 holds one unit of R1 and requests one unit of R2
Process P4 holds two units of R3 and requests one unit of R1.
Required: using the scenario above, explain and justify whether the system is
deadlocked or not [5 Marks]
