Automation System
A venturi tube:

can be used to measure gas or liquid flow rates
is extremely difficult to use
measures the presence of a liquid
None of these
is made only of metal

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Automation System
Relay ladder logic is used in a PC because:

most industrial control personnel are familiar with relay ladder logic diagrams and this is the easiest for them to use
None of these
it is the best industrial control language ever developed.
it is impossible to write a control program for a machine in any other logic
All of these

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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
do not leave training manuals unsecured
run regular simulated tests using TARP (testing of Applications Recovery Planes)
do not allow unbonded service people to work on your equipment

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