Automation System
The two types of relays in a PC are:

None of these
All of these
an output relay and a control relay
a retentive relay and a non-retentive relay
a control relay and a retentive relay

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Automation System
Today, programmable controllers:

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

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Automation System
Vision sensors:

can not improve much in the next decade
will remain very costly
will more closely match the capabilities of the human eye
None of these
All of these

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