Automation System
Programmable controllers:

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

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Automation System
An aneroid barometer

None of these
is very unreliable
can measure only atmospheric pressure
can be used to measure gas or liquid flow rates
measures pressure by sensing deflection of an evacuated chambers.

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