Automation System
The program execution time:

will vary depending on the language used
must be slower than the fastest mechanical operation that is to be controlled
All of these
cannot be changed once the program is written
None of these

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Automation System
An aneroid barometer

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

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

it is impossible to write a control program for a machine in any other logic
All of these
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.
None of these

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