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Friday, July 15, 2016

Operating system test questions for interview

(1) The use of __________ works on the principle of locality.
Cache memory Interrupts Polling DMA

(2) Consider a computer system with 6 tape drives and n processes completing for them. What is the maximum value of n for the system to be deadlock free assuming each processes may need 3 tape drives?
3 2 4 7

(3) When size of the memory is increased the page replacement policy that sometimes leads to more page faults is
FIFO Optimal LRU None of the above

(4) The capacity of a memory unit = The number of words x The number of bits/words. For the memory of 4k x 16 the number of separate address and data lines needed is
12 address and 16 data lines 12 address and 12 data lines 11 address and 6 data lines 12 address and 8 data lines

(5) A system has m number of resources of same type and 3 processes A, B and C. share these resources. A, B and C have the peak demand of 3, 4 and 6 respectively. Deadlock will not occur if
m = 15 m = 8 m = 13 m = 9

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