Automation System
Today, programmable controllers:

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

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Automation System
Pressure sensors:

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

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Automation System
D/A (digital to analog) conversion:

has to be sampled at 1/2 the highest input frequency
None of these
results in a binary code as the final output
must be fed through a filter to reproduce the original signal accurately
both (b) and (c)

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