Q.1
14 Marks(a)
Define true virtualization with example.
(b)
Write a shell script to find factorial of an user-defined natural number.
Also asked in Summer 2025 Q4a OR
(c)
Draw and explain seven state process state transition diagram in detail.
Gujarat Technological UniversityWinter 2023 examination
GTU 3140702 Operating System (OS) Winter 2023 Question Paper & PDF
B.E. · Computer Engineering · Semester 4 · Subject code 3140702
- Total
- 70 marks
- To pass
- 23 marks (33%)
- Duration
- 2.5 Hours 10:30 AM – 1:00 PM
- Questions
- 5 with internal choice
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8 of 25 questions on this paper were also asked in other years. Each is marked below with the years it appeared.See all 27 repeated 3140702 questions, most asked first
Q.2
14 Marks(a)
Explain the main function of a dispatcher in brief.
(b)
List and briefly define four classes of real-time scheduling algorithms.
(c)
Five batch jobs A, B, C, D and E arrive at same time. They have estimated running times 10, 6, 3, 4 and 8 ms. For each of the following algorithm determine mean process turnaround time. Consider process swapping overhead is 1 ms.
1)FCFS
2)Round-Robin (Time quantum = 2 ms)
OR
(c)
Five batch jobs P1, P2, P3, P4 and P5 arrive at 0, 1, 2, 3 and 4 ms. They have estimated running times 14, 12, 8, 3 and 6 ms. Their priorities are 3, 5, 2, 1 and 4 respectively with 5 being highest priority. For each of the following algorithm determine mean process turnaround time. Consider process swapping overhead is 0.5 ms.
1)SJF (Non-preemptive)
2)Priority Scheduling (Preemptive)
Q.3
14 Marks(a)
Give the difference between weak semaphore and strong semaphore.
(b)
Briefly explain critical section.
(c)
Explain producer-consumer problem and solve it using semaphore.
Write pseudo code for the same.
Also asked in Summer 2026 Q1c, Winter 2024 Q3c
OR
(a)
Give the key difference between a mutex and a binary semaphore.
(b)
List the requirements for mutual exclusion.
(c)
Explain Dining philosopher problem and its solution using semaphore.
Also asked in Winter 2025 Q2c, Winter 2024 Q3c OR, Summer 2023 Q3c OR
Q.4
14 Marks(c)
Write and explain Banker’s Algorithm for deadlock avoidance with suitable example.
Also asked in Winter 2025 Q4c, Summer 2025 Q3c, Winter 2024 Q5c OR, Summer 2023 Q4c
OR
(a)
Compare RAID level 3 with RAID level 4.
(b)
Write a short note on design principles of OS security.
(c)
Write and explain deadlock detection algorithm with suitable example.
Q.5
14 Marks(a)
Explain concept of thrashing.
(b)
Given the following track requests in the disk queue, compute for the Total Head Movement (THM) of the read/write head and seek time needed for SSTF Disk Scheduling approach: 86, 147, 91, 230, 94, 168, 270, 30 Consider that the read/write head is positioned at location 150. A seek takes 3 ms per cylinder move. Consider a disk drive with 300 cylinders.
(c)
Explain any three memory placement algorithms with suitable example.
Also asked in Summer 2023 Q4a OR
OR
(a)
Compare and contrast paging with fragmentation.
(b)
Given the following track requests in the disk queue, compute for the Total Head Movement (THM) of the read/write head and seek time needed for C-SCAN Disk Scheduling approach: 95, 180, 34, 119, 11, 123, 62, 64 Consider that the read/write head is positioned at location 50. A seek takes 5 ms per cylinder move. Consider a disk drive with 200 cylinders.
(c)
Explain any three page replacement algorithms with suitable example.
Also asked in Summer 2025 Q4c, Winter 2024 Q5c
More Operating System papers
Questions repeat across sessions. Working through two or three papers shows you which topics GTU asks most.
Other Semester 4 subjects
BE Computer
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About this paper
Official Gujarat Technological University (GTU) examination paper for Operating System (OS) (Winter 2023, B.E. · Computer Engineering, Sem 4). Features complete 70-mark regular & remedial examination pattern, official marking distribution across all 5 questions, and direct 1-click official PDF download.
Transcribed for student exam preparation from Gujarat Technological University official examination archives. Questions, syllabus guidelines, and curriculum marking schemes remain the intellectual property of Gujarat Technological University.