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

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

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Automation System
A dc servo motor:

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

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Automation System
A common data base is one requisite for converting CAD and CAM to CIM. Another is that:

None of these
technical assistance must be provided to the user.
the user must have access to both hardware and software
the system must make provision for new techniques.
there should be a common 3-D part description system.

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