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MECHANICAL AND ELECTRICAL SYSTEMS CHAPTER 20 QUESTIONS AND ANSWERS | EXAM PREP & STUDY GUIDE 2026/2027

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MECHANICAL AND ELECTRICAL SYSTEMS CHAPTER 20 QUESTIONS AND ANSWERS | EXAM PREP & STUDY GUIDE 2026/2027

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MECHANICAL AND ELECTRICAL SYSTEMS CHAPTER 20 QUESTIONS AND ANSWERS | EXAM
PREP & STUDY GUIDE 2026/2027



Circuit - ANS ✔✔is a complete path (when ON) for current to take that includes electrical
control devices, circuit protection, conductors, and load(s)



static electricity - ANS ✔✔is an electrical charge at rest



semiconductor - ANS ✔✔is an electronic device that has electrical conductivity between that of
a conductor (high conductivity) and that of an insulator (low conductivity)



if a fire should occur, the first thing an individual must do is _______ - ANS ✔✔provide an alarm



Ground Fault Circuit Interrupter (GFCI) - ANS ✔✔is a fast-acting receptacle that detects low
levels of leakage current to ground and opens that circuit in response to the leakage



Class A - ANS ✔✔fires that are typically controlled with water



dry powdered compound - ANS ✔✔extinguishing agent for class D



Before connecting a tool to a power source, ensure that the on/off switch is in the _________
position - ANS ✔✔OFF



circuit breaker - ANS ✔✔is an over current protection device with a mechanical mechanism that
may manually or automatically open a circuit when an overload condition or short circuit occurs



time-delay plug - ANS ✔✔fuse is a screw-in type electrical safety device with a dual element

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