Automation System
A microprocessor:

is another name for a computer
executes a program of instructions
is a CPU in integrated circuit form
None of these
(a) and (c)

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Automation System
D/A (digital to analog) conversion:

must be fed through a filter to reproduce the original signal accurately
None of these
both (b) and (c)
has to be sampled at 1/2 the highest input frequency
results in a binary code as the final output

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

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

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