Automation System
An operational amplifier:

can be used to sum two or more signals
All of these
can be used to subtract two or more signals
None of these
uses the principle of feedback

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Automation System
Trend analysis:

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

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Automation System
Digital signals:

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

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