Automation System
Historically, central systems were used because:

semiconductor memory was not available
memory consumed a large amount of power
memory was very expensive
None of these
All of these

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Automation System
One of the major benefits of using CAD in tool design is that:

tool motions can be checked to see if there is interference between the tool and the object
product design represents approximately one-half the engineering costs
there is better coordination in the materials-handling area
None of these
it simplifies the trial-and-error method

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Automation System
A venturi tube:

is extremely difficult to use
can be used to measure gas or liquid flow rates
measures the presence of a liquid
is made only of metal
None of these

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Automation System
Today, programmable controllers:

can be cost effective even when replacing just a few relays
are relatively low cost compared with the original digital equipment available for industrial control
All of these
are more powerful then the first controllers on the market
None of these

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Automation System
Direct Numerical Control means:

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

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