Automation System
A flip-flop:

None of these
remembers what was previously stored in it
is a sequential logic device
(a) and (c)
is a combinational logic device

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

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Automation System
Pressure sensors:

use capacitive variations to sense pressure
None of these
All of these
use an aneroid chamber with a variable resistance output
use the piezoresistive effect in strain gauge sensors

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