Automation System
The electronic component that has been the key to recent developments in automation is the:

None of these
improved vacuum tube
integrated circuit
transistor
diode

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

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

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Automation System
A solenoid:

None of these
is widely used in industrial automation
is related to an aneroid
can be used only in de circuits
is spring operated

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