Automation System
Four basic elements are required for an automated machine tool or production process. They are: input interface, memory, output interface and:

software
None of these
logic
NC tape programming
computer graphics workstation

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Automation System
Digital signals:

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

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Automation System
A stepping motor;

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

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