Automation System
The program counter:

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

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Automation System
Time proportioning control:

a and b above.
cannot use a TM990 micro¬computer
can be used on a PM550 programmable process controller
is less efficient than normal PID control
None of these

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