Automation System
Programmable controllers:

(a) and (c) above
cannot perform functions other than relay logic
are programmed using relay ladder logic
are widely used in many different industries
None of these

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Automation System
Pressure sensors:

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

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