Automation System
An operational amplifier:

can be used to subtract two or more signals
All of these
uses the principle of feedback
None of these
can be used to sum two or more signals

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Automation System
The computer graphics system called SKETCHPAD was demonstrated at

Cranfield Institute of Technology, London, 1962
Imperial college of Science and Technology, London, 1973
None of these
University of Aston, Birmingham, 1960
Massachusetts Institute of Technology in 1963

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Automation System
A process controller:

can interface to digital and analog I/O
can solve a PID process control equation easily
is useful in a continuous process control application
None of these
All of these

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