Automation System
Today, programmable controllers:

are more powerful then the first controllers on the market
All of these
can be cost effective even when replacing just a few relays
None of these
are relatively low cost compared with the original digital equipment available for industrial control

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Automation System
Relay ladder logic is used in a PC because:

None of these
All of these
it is impossible to write a control program for a machine in any other logic
most industrial control personnel are familiar with relay ladder logic diagrams and this is the easiest for them to use
it is the best industrial control language ever developed.

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Automation System
Pressure sensors:

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

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Automation System
The computer graphics system called SKETCHPAD was demonstrated at

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

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