Automation System
An aneroid barometer

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

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Automation System
Trend analysis:

can improve control system response
is used only in financial planning
is a brand new concept
requires a very expensive system to implement
None of these

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Automation System
Direct Numerical Control means:

complete elimination of a need for a human operator.
None of these
using one computer to control several machines
eliminating computers from the manufacturing process
using several computers to control one large machine

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Automation System
Relay ladder logic is used in a PC because:

None of these
it is impossible to write a control program for a machine in any other logic
most industrial control personnel are familiar with relay ladder logic diagrams and this is the easiest for them to use
it is the best industrial control language ever developed.
All of these

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