Question 24

Analyze each statement:

• Statement A: Turnaround time is defined as the total time interval from process submission to process completion: $\text{Turnaround time} = \text{Completion time} - \text{Arrival time} = \text{Burst time} + \text{Waiting time}$. Thus, turnaround time includes waiting time. Statement A is correct.

• Statement B: CPU scheduling aims to maximize CPU utilization and maximize throughput (not minimize throughput), while minimizing turnaround time, waiting time, and response time. Statement B is incorrect.

• Statement C: Round-robin scheduling allocates a fixed time quantum to each ready process in cyclic order. It does not require prior knowledge of the CPU burst time of any process (unlike SJF or SRTF). Statement C is correct.

• Statement D: Preemptive scheduling requires regaining CPU control from a running process when its time quantum expires or a higher-priority process arrives. This requires hardware support, specifically an interval timer that generates hardware interrupts. Statement D is correct.