Automation System
Stepping motors:

can run both clockwise and counterclockwise
can be built to index different amounts by changing the pole configuration
do not require commutators
can run at varying speeds
All of these

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Automation System
Time proportioning control:

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

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