Automation System
A stepping motor;

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

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Automation System
Direct Numerical Control means:

complete elimination of a need for a human operator.
using one computer to control several machines
eliminating computers from the manufacturing process
None of these
using several computers to control one large machine

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Automation System
Digital signals:

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

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Automation System
The program execution time:

will vary depending on the language used
All of these
must be slower than the fastest mechanical operation that is to be controlled
cannot be changed once the program is written
None of these

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