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BIT Operating System

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BIT Semester 3 Operating System Question Paper 2079 – Solved

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Institute of Science and Technology

2079

Bachelor in Information Technology

Operating System

BIT204

Full Marks: 60

Pass Marks: 24

Candidates are required to give their answers in their own words as far as practicable. The figures in the margin indicate full marks.

"Section B"

Short Answer Questions Attempt any EIGHT questions.

[8 × 5 = 40]

1.

What is an OS? Explain 3-state model of process with neat and clean diagram.

[1 + 4]
2.

What is race condition? Explain critical problem solution using lock variable.

[2 + 3]
3.

What is memory compaction? Explain best fit memory allocation with suitable example.

[1 + 4]
4.

What is RAID? Explain Level-2 and Level-3 RAID.

[1 + 4]
5.

How threads differ from processes? Explain user level thread and kernel level thread.

[2 + 3]
6.

Consider the following page reference string: 3,2,1,3,4,2,8,9,7,4,2,9,8,3. Calculate the total number of page faults for Optimal and LRU page replacement algorithms using 4 page frame

[5]
7.

Explain the working mechanism of DMA.

[5]
8.

What is TLB? Explain the importance of TLB in conversion of logical address to physical address.

[2 + 3]
9.

Consider 500 GB hard drive with 5 KB block size. Calculate the size of file allocation table if entry for each block needs 4 bytes.

[5]