Automation System
How is the integral mode implemented using analog methods?

Op amp and resistors
Op amp and an RC network to place the error voltage across the capacitor
Op amp and a capacitor
None of these
All of these

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Automation System
The computer graphics system called SKETCHPAD was demonstrated at

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

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Automation System
Sensors:

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

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Automation System
Digital signals:

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

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