Automation System
Timing using a TM990 micro-computer:

require an external timer added by the user
both (b) and (c)
None of these
can be handled in software
is available on the standard CPU board

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Automation System
Digital signals:

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

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Automation System
Trend analysis:

can improve control system response
is used only in financial planning
is a brand new concept
requires a very expensive system to implement
None of these

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