Automation System
What two methods are available to build electronic continuous control?

Analog and digital
Pneumatic and analog
None of these
Analog and mechanical
All of these

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Automation System
What is offset error?

the difference between the sensor input and the absolute sensed parameter.
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
None of these

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Automation System
Time proportioning control:

is less efficient than normal PID control
None of these
a and b above.
can be used on a PM550 programmable process controller
cannot use a TM990 micro¬computer

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