Operating Systems (AD-405) - Important Questions

Explain the different types of operating system services with suitable examples.

Define an operating system and explain its goals and functions. How does the operating system perform management tasks in a system?

What is a file? Explain different file attributes and file operations.

Suppose a disk drive has 5000 cylinders numbered 0 to 4999. Given the current head position and a queue of pending requests, calculate total head movement distance using SSTF, SCAN and LOOK disk scheduling algorithms and compare them.

Compare the following CPU scheduling algorithms highlighting the strengths and limitations of each: FCFS, SJF, Priority and Round Robin. Illustrate with Gantt charts.

Why is semaphore important in OS? Explain binary and counting semaphores with suitable examples and how they provide solution to the critical section problem.

What resources are used when a thread is created? How do they differ from those used when a process is created? Explain user level and kernel level threads.

Write a semaphore-based solution for the dining philosophers problem.

How is process differing from program? Describe the process life cycle and process transition diagram in detail.

Explain deadlock prevention in detail. Discuss the necessary conditions and strategies to prevent deadlock.

Calculate the number of page faults for the given reference string and frames using FIFO, LRU and Optimal page replacement and compare them. Explain implementation by demand paging.

What is segmentation? Explain virtual/logical to physical address translation in a segmented system with diagram and example.

Explain disk space allocation methods - contiguous, linked and indexed - with advantages and disadvantages.

To build robust distributed systems, you must know what kinds of failures can occur. List three possible types of failures in a distributed system.

Write short notes on any two of the following: a) Network Operating Systems b) Distributed Operating Systems c) Multiprocessor Operating Systems