Automation System
Productivity is defined as:

cost per unit
output per man-hour of labour
None of these
number of items manufactured per day
cost per day

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Automation System
An aneroid barometer

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

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Automation System
A process controller:

can interface to digital and analog I/O
can solve a PID process control equation easily
All of these
None of these
is useful in a continuous process control application

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