Automation System
Semiconductor devices:

have a very short infant mortality period
are less reliable than electro¬mechanical components
All of these
None of these
usually have a very short MTBF (mean time between failure)

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

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

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Automation System
What is offset error?

None of these
the difference between the control setpoint value and the actual value.
the difference between the controller output and the setting of the manipulated variable.
All of these
the difference between the sensor input and the absolute sensed parameter.

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Automation System
Programmable controllers:

are programmed using relay ladder logic
are widely used in many different industries
None of these
(a) and (c) above
cannot perform functions other than relay logic

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