Question Paper: Operating Systems : Question Paper Dec 2015 - Computer Engineering (Semester 5) | Mumbai University (MU)

Operating Systems - Dec 2015

Computer Engineering (Semester 5)

(1) Question 1 is compulsory.
(2) Attempt any three from the remaining questions.
(3) Assume data if required.
(4) Figures to the right indicate full marks.

Attempt any four question:

1 (a) Differentiate between Monolithic and Microkernel.(5 marks) 1 (b) Explain effect of page size on performance.(5 marks) 1 (c) Draw and explain five state process models.(5 marks) 1 (d) Explain disk cache.(5 marks) 1 (e) Explain "chmod" command in UNIX.(5 marks) 1 (f) What do you meant by 'Busy Waiting'? What is wrong with it?(5 marks) 2 (a) Explain in detail file management in UNIX.(10 marks) 2 (b) Explain dining philosopher problem and solution to it.(10 marks) 3 (a) What is deadlock? Explain necessary and sufficient conditions to occur deadlock. what is the difference between Deadlock avoidance and prevention?(10 marks) 3 (b) Consider the following set of process with CPU burst time.

Process Burst Time Arrival Time
P1 10 11
P2 04 2
P3 05 3
P4 03 4

i) Draw Gnatt chart for CFS, SJF pre-emptive and Round Robin (Quantum=0.3). Calculate average waiting time and average turnaround time.(10 marks) 4 (a) What is Operating System? Explain different functions and objectives of operating system.(10 marks) 4 (b) What is mutual exclusion? Give software approach for mutual exclusion.(10 marks) 5 (a) Consider following snapshot at time T0:5 processes P0 through P4.3 resources types A(10 units), B(5 units) and C(7 units).
  A B C A B C A B C
P0 0 1 0 7 5 3 3 3 2
P1 2 0 0 3 2 2      
P2 3 0 2 9 0 2      
P3 2 1 1 2 2 2      
P4 0 0 2 4 3 3      

i) Compute "Still Need" matrix?
ii) Is system currently in safe or unsafe state? Why?
(10 marks)
5 (b) Explain various I/O buffering techniques.(10 marks) 6 (a) What is system calls of operating systems? Explain any five systems calls.(10 marks) 6 (b) Explain techniques of disk scheduling.(10 marks)

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