Automation System
An encoder:

converts a binary number to a decimal number.
None of these
can have only four keys
converts an input to a binary number
is used to send telegraph signals

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Automation System
Stepping motors:

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

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Automation System
The use of specialized workstations:

None of these
provides limited growth potentials for 3-D
reduces the host computer workload
reduces the host computer workload and allows more users
has a high cost-performance tradeoff

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