Mechanic 150 Review Exam Questions And Answers

Energizing a relay coil ____ contacts that were normally open and ____ contacts that were normally closed - ️️closes , opens Making contacts are - ️️Normally open contacts Breaking contacts are - ️️normally closed contacts What happens to wire connections when you have AC Relay chatter - ️️AC relay chatter causes contacts to crystalize and break A better DC power supply system that eliminates the dip to zero current at anytime - ️️3 phase full wave rectifier system A contact on a relay that shorts out the circuit which energized the relay is called - ️️a self holding contact why do power companies generate AC instead of DC - ️️it is cheaper to manufacture and it takes less wires (cables) to distribute the secondary voltage is higher then the primary voltage. _________ - ️️step up transformer on a hydro, can your 110v come from the controller - ️️no, the 110v for the light and fan etc must come from a separate source how do you plumb a hydraulic jack - ️️use a spider bob