Automation System
A solenoid:

None of these
is widely used in industrial automation
can be used only in de circuits
is related to an aneroid
is spring operated

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Automation System
Pressure sensors:

use an aneroid chamber with a variable resistance output
None of these
use the piezoresistive effect in strain gauge sensors
use capacitive variations to sense pressure
All of these

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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
Massachusetts Institute of Technology in 1963
University of Aston, Birmingham, 1960

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