Automation System
The program counter:

None of these
decides which program to run
is where arithmetic is done in a computer.
counts the number of instructions that have been executed
contains the address of the next instruction to be executed

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Automation System
Pressure sensors:

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

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