Automation System
One advantage of a PC in industrial control is that it:

All of these
None of these
is very difficult for the inexperienced programmer to understand
is unreliable because there are no moving parts
has a reliable long life compared to relay logic

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Automation System
The main function(s) of computer in CAD is/are

All of these
To serve as an extension to the memory of the designer
None of these
To relieve the designer from routine repetitious tasks.
To enhance the analytical and logical power of the designer

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Automation System
Digital signals:

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

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