Automation System
A programmable controller:

None of these
All of these
both (a) and (b)
is easier to troubleshoot than standard relay logic
allows faster machine checkout

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Automation System
An aneroid barometer

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

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Automation System
Numerical control:

None of these
All of these
is a method for producing an exact number of parts per hour
is a method for controlling the operation of a machine by means of a set of instructions
applies only to milling machines

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