Automation System
Pressure sensors:

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

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Automation System
Time proportioning control:

a and b above.
can be used on a PM550 programmable process controller
None of these
cannot use a TM990 micro¬computer
is less efficient than normal PID control

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Automation System
Today, programmable controllers:

can be cost effective even when replacing just a few relays
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
All of these

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