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

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

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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.
None of these
decides which program to run
counts the number of instructions that have been executed

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