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

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
it is impossible to write a control program for a machine in any other logic

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Automation System
Digital signals:

have a sinusoidal shape.
are assigned values of 1 or 0 depending on the voltage level
None of these
can have three possible levels
have a frequency measured in units of hertz

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Automation System
A continuous process is:

None of these
used only for simple tasks
used only with analog controllers.
self-contained in that raw materials enter the process and an identifiable products exits the process.
one that never shuts down

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