Automation System
Light sensors:

come in a wide variety of mounting styles
work in direct sunlight
cannot be used a s limit switches.
None of these
never use infrared light as light source

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Automation System
Direct Numerical Control means:

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

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Automation System
Numerical control:

applies only to milling machines
None of these
All 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

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Automation System
A dc servo motor:

uses a tachometer for speed feedback
can provide precise position control
uses a variable dc voltage for speed control
None of these
All of these

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