What happens when the circuit requires pilot devices to use more contacts than they contain?
What will be an ideal response?
When the circuit requires pilot devices to use more contacts than they contain, it is common practice to let a set of contacts on the pilot device operate a control relay. The contacts of the control relay can be used as needed to fulfill the requirements of the circuit.
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IDENTIFY TEST PROCESS SYMBOLS AND DIAGRAMS
You have pushed in the trailer supply valve. You should not move the tractor until the whole air system is:
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