C05-CM-403
458
BOARD DIPLOMA EXAMINATION,
(C-05)
OCTOBER/NOVEMBER-2011
DCME-IV SEMESTER
EXAMINATION
OPERATING SYSTEMS
TIME: 3
HOURS]
[TOTAL MARKS:100
PART A
Instructions: (1) Answer all questions and each question
carries four marks.(2) Answer should be brief and straight to the point and
shall not exceed five simple sentences.
1. Explain briefly about
timesharing.
2. List any siz operating
system services
3. What is the purpose of
multi-threading model? List any two models.
4. What is the difference
between preemptive and non-preemptive scheduling?
5. Explain the wait and
signal operations on a semaphore S
6. What is address binding?
Explain about compile time binding?
7. Explain the concept of
demand paging.
8. When does a page-fault
occur?
9. Explain linked-list free
space management technique.
10. Explain briefly about
sequential file access method.
PART-B
5*12=60
INSTRUCTIONS: (1) Answer any five questions and each equestion
carries twelve marks. (2) The answer should be comprehensive and the criteria
for valuation is the content but not the length of the answer.
11. (a) expand “SPOOL”.
Explain the concept of spooling with approapriate sketch. (b) define a system
call. Explain any two types of system calls.
12. (a) explain the five
states of a process. (b) explain any five pieces of information stored in PCB.
13. (a) Explain ready queue
and I/O queue with appropriate sketch of queuing diagram. (b) discuss about
message system in interprocess communication
14. (a) Define a deadlock
state.(b) Explain the following two options used for recovery from a deadlock
state. (i) process termination(ii) resource preemption.
15. (a) explain paging with
appropriate diagrams. Give one example (b) Explain briefly the concept of
virtual memory.
16. (a) Write the procedure
for handling a page-fault. (b) Explain the cause for thrashing.
17. (a) explain linked and
indexed file allocation methods. (b) Explain SSTF disk scheduling algorithm.
18. (a) explain in detail
about the structure of tree structured directory. (b) explain any four basic
file operations.
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