Automation System
There are several procedures you can implement to provide maximum security. The most important of these is:

None of these
Verify the reputation of the people installing your system
run regular simulated tests using TARP (testing of Applications Recovery Planes)
do not allow unbonded service people to work on your equipment
do not leave training manuals unsecured

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Automation System
What is proportional control?

None of these
The gain is independent of offset error.
The controller output varies continuously over a range
It has a discrete output for each error value
All of these

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