Automation System
Most continuous control actuators:

None of these
use a 4 to 20 mA current loop input
are used with standard continuous control loop
are of the time proportioning type
(b) and (c) above

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Automation System
Numerical control:

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

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