Automation System
Most continuous control actuators:

are of the time proportioning type
None of these
use a 4 to 20 mA current loop input
are used with standard continuous control loop
(b) and (c) above

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Automation System
What is offset error?

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

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Automation System
A semi-continuous operation means:

coffee breaks are allowed for the operator
each operation in a sequence is continuous, but subsequent operations in the sequence may be different.
None of these
a computer is a required part of the machine
the operation is continuous each shift, but stops between shifts

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Automation System
Sensors:

None of these
are easily developed
are not important in automation
will be much smarter and more sophisticated in the future
probably will not improve over the next decade

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