Automation System
The program counter:

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

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Automation System
Numerical control:

applies only to milling machines
None of these
is a method for producing an exact number of parts per hour
is a method for controlling the operation of a machine by means of a set of instructions
All of these

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Automation System
Direct Numerical Control means:

using one computer to control several machines
None of these
using several computers to control one large machine
eliminating computers from the manufacturing process
complete elimination of a need for a human operator.

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