Automation System
What is the difference between integral and derivative control?

derivative control responds to a change in the rate of change in the error signal
integral control has slower response to an error signal.
None of these
derivative control does not eliminate offset error
All of these

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Automation System
The program counter:

contains the address of the next instruction to be executed
counts the number of instructions that have been executed
is where arithmetic is done in a computer.
None of these
decides which program to run

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Automation System
Digital signals:

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

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

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