Automation System
A sequence controller:

None of these
is no longer in widespread use
is difficult to program
is a mechanical only controller
performs on/off control functions in relation to time.

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Automation System
A stepping motor;

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

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Automation System
An encoder:

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

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