Automation System
A dc servo motor:

can provide precise position control
None of these
All of these
uses a variable dc voltage for speed control
uses a tachometer for speed feedback

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

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

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