Operating System (OS)
The primary purpose of an operating system is:

To make the most efficient use of the computer hardware
To keep systems programmers employed
To allow people to use the computer
To make computers easier to use

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Operating System (OS)
The dispatcher

is always small and simple
actually schedules the tasks into the processor
None of these
never changes task priorities
puts tasks in I/O wait

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Operating System (OS)
Round-robin scheduling

is quite complex to implement
gives each task the same chance at the processor
allows processor-bound tasks more time in the processor
allows interactive tasks quicker access to the processor
None of these

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