Automation System
The SKETCHPAD system

is used for interactive Graphics
None of these
is expensive because it is sophisticated and make demands on the power and resources of the computer.
consisted of an cathode-ray oscilloscope driven by a Lincoln Tx2 computer where by graphical information was displayed on the screen.
All of these

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Automation System
Time proportioning control:

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

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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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