Automation System
Digital signals:

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

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Automation System
The program counter:

contains the address of the next instruction to be executed
is where arithmetic is done in a computer.
counts the number of instructions that have been executed
decides which program to run
None of these

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