Automation System
Time proportioning control:

a and b above.
can be used on a PM550 programmable process controller
cannot use a TM990 micro¬computer
is less efficient than normal PID control
None of these

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Automation System
A stepping motor;

has a speed proportional to voltage input
is a good choice where continuous rotation is needed
can index positional movement.
has a commutator
None of these

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