UGC-NET | UGC NET CS 2018 Dec – II | Question 15

Consider the following set of processes and the length of CPU burst time given in milliseconds:

Assume that processes being scheduled with Round-Robin Scheduling Algorithm with Time Quantum 4ms. Then The waiting time for P4 is _________ ms.
(A) 0
(B) 4
(C) 12
(D) 6

Answer: (C)
Explanation: According to Round-Robin Scheduling Algorithm with Time Quantum 4ms :

Gantt chart,

So, waiting time for P4 = 16 − 4 = 12 ms.

Option (C) is correct.
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