Automation System
A stepping motor;

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

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Automation System
A sequence controller:

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

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Automation System
Digital signals:

can have three possible levels
are assigned values of 1 or 0 depending on the voltage level
have a sinusoidal shape.
None of these
have a frequency measured in units of hertz

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