Operating Systems : Question Paper Dec 2015 - Computer Engineering (Semester 5)

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Operating Systems - Dec 2015

Computer Engineering (Semester 5)

TOTAL MARKS: 80
TOTAL TIME: 3 HOURS (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).

	ALLOCATION	MAX	AVAILABLE
	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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