Automation System
A flexible manufacturing system may be:

very difficult to change when new products are introduced
All of these
expensive to alter
None of these
an automated assembly line

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Automation System
Stepping motors:

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

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Automation System
Programmable controllers:

are widely used in many different industries
cannot perform functions other than relay logic
(a) and (c) above
are programmed using relay ladder logic
None of these

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