Automation System
Time proportioning control:

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

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Automation System
Pressure sensors:

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

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