Automation System
What is offset error?

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

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Automation System
A sequence controller:

is difficult to program
None of these
performs on/off control functions in relation to time.
is no longer in widespread use
is a mechanical only controller

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Automation System
An operating system:

All of these
is useless in most control applications
can help reduce software development time
provides ability for other programmers to understand the software structure
None of these

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Automation System
A dc servo motor:

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

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Automation System
Digital signals:

are assigned values of 1 or 0 depending on the voltage level
have a frequency measured in units of hertz
have a sinusoidal shape.
None of these
can have three possible levels

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