Download Physics 715 Assessment Exam: Three-Phase AC Power and Elevator Electrical Systems and more Exams Physics in PDF only on Docsity! Physics 715 Assessment Exam Questions with Answers Latest Update 2024 Test three phase ac is transformed down to between ___ and ___ volts before being sent to a building power distribution panel - Correct Answers 208 and 480 a 220v single phase system uses two ___ wires and a green ___ wire - Correct Answers hot , ground a 110 volt single phase system uses one ___wire, a ___wire and a green ___ wire - Correct Answers hot, neutral, ground grounding refers to deliberately connecting parts of a wiring installation to ____ ____ - Correct Answers earth ground grounding falls into two categories ____ ___ and ___ ___ - Correct Answers system ground, equipment ground the purpose of grounding is ___? - Correct Answers safety all elevator equipment, cabinets and raceway systems must be tied to a common safety ground. this is referred to as ___? - Correct Answers bonding a main line disconnect switch has 2 sets of 3 terminals. one labeled ___ usually connected to the top of the box and one labeled ___ usually connected to the bottom of the box - Correct Answers line, load the line side terminals are called ___, ___, ___. - Correct Answers A, B, C the load side terminals are called ___, ___, ___. - Correct Answers L1, L2, L3 T or F. when the mainline disconnect switch is in the off position it can be assumed that the wires leading to the elevator are dead. - Correct Answers false T or F? an auxiliary contact on a mainline disconnect switch is used when an elevator is equipped with a recue mode feature. - Correct Answers true a type of mainline disconnect that will trip in an overcurrent condition and can be reset is called a ___ ___ - Correct Answers circuit breaker T or F? a shunt trip breaker is used in elevator machine rooms that have sprinklers installed - Correct Answers True a ___ is a safety device that opens an electrical feed in the event of an over current condition - Correct Answers fuse all fuses are rated by ___ and ___ - Correct Answers voltage and amperage a ___ ___ fuse is used in transformer and motor circuits - Correct Answers time delay when a wire size is reduced a proper ___ must be placed in the circuit - Correct Answers fuse T or F. a blown fuse can result in a reduced control voltage - Correct Answers true T or F. you need to open the main line disconnect switch in order to check the three phase power. - Correct Answers false T or F. fuse blowing can be caused by loose fuse or terminal connections - Correct Answers true always remove or replace a fuse with the power ___. - Correct Answers off three types of transformers used in the elevator industry are ___, ___, and ___ - Correct Answers step up,step down ,isolation the primary winding of a transformer is usually designated with a ___ and the secondary is designated with an ___ - Correct Answers H, X a ___ allows current to flow in one direction and blocks current flow in the opposite direction - Correct Answers diode two types of single phase dc power supplies are the ___ and the ___ - Correct Answers half wave full wave three phase full wave rectifiers use ___ rectifier diodes - Correct Answers 6 a blown AC fuse on a three phase rectifier will cauexciterse the output to ____ - Correct Answers decrease the ___is a self excited generator used as a dc power supply - Correct Answers exciter T or F. an exciters polarity can be reversed by a brush problem or a short - Correct Answers T
