Automation System
An operational amplifier:

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

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Automation System
Trend analysis:

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

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Automation System
An encoder:

converts a binary number to a decimal number.
None of these
converts an input to a binary number
can have only four keys
is used to send telegraph signals

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