Automation System
Today, programmable controllers:

All of these
None of these
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
are more powerful then the first controllers on the market

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Automation System
A dc servo motor:

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

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Automation System
A venturi tube:

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

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