Operating System (OS)
The main function of the dispatcher (the portion of the process scheduler) is

bring processes from the disk to the main memory
assigning ready process to the CPU
suspending some of the processes when the CPU load is high
swapping a process to the disk
None of these

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Operating System (OS)
Scheduling is

unrelated to performance consideration
None of these
allowing jobs to use the processor
not required in uniprocessor systems
the same regard-less of the purpose of the system

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