Automation System
Using a microcomputer as a controller allows:

simpler mechanical hardware
None of these
more self diagnostics of the machine operation
All of these
faster cycle time

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Automation System
Relay ladder logic is used in a PC because:

None of these
it is impossible to write a control program for a machine in any other logic
most industrial control personnel are familiar with relay ladder logic diagrams and this is the easiest for them to use
All of these
it is the best industrial control language ever developed.

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Automation System
Direct Numerical Control means:

complete elimination of a need for a human operator.
eliminating computers from the manufacturing process
None of these
using several computers to control one large machine
using one computer to control several machines

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Automation System
Pressure sensors:

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

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