Automation System
A Hall effect switch is usually used to:

None of these
sense a vacuum
measure temperature
sense the presence of a magnetic object.
measure voltage

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Automation System
An encoder:

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

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Automation System
Most industrial control applications:

can be solved using more than one method of control
can be done more reliably using solid-state methods
None of these
All of these
must have the process specified correctly to be successful

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