Automation System
A drum timer is a good example of:

an output actuator
an input sensor
None of these
a position sensor
a sequence controller

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

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

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Automation System
Most industrial control applications:

All of these
can be done more reliably using solid-state methods
can be solved using more than one method of control
must have the process specified correctly to be successful
None of these

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