Automation System
In the operation of a programmable controller:

any latched data must be done using an external latching relay
None of these
mathematics cannot be performed
All of these
all of the logic status is maintained in memory

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Automation System
Time proportioning control:

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

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Automation System
Pressure sensors:

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

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