101 Basic Series - Module 08 - CEU Education Your final score on this exam will be emailed to you for your records. First name:   Last name:   Company name:   E-Mail Address   City   State   NO STATEALAKASAZARCACOCTDEDCFMFLGAGUHIIDILINIAKSKYLAMEMHMDMAMIMNMSMOMTNENVNHNJNMNYNCNDMPOHOKORPAPRPWRISCSDTNTXUTVTVIVAWAWVWIWY Province (Optional)   Country (Optional)   1 The function of the arc extinguisher is to _________ and _________ the arc. Release and Bend Divide and Release Bend and Confine Divide and Confine 2 Most faults on a motor circuit are caused by a breakdown of the insulation within the motor windings resulting in low level short circuit that quickly cascade into major faults. True False 3 Endcap kits, rear-connected studs, and plug-in adapters are used to connect circuit breakers to the bus bar in switchboards. True False 4 An undervoltage release mechanism should be used as a circuit interlock. True False 5 Motor circuit protectors disconnect the motor load from an electrical supply under what condition? When the handle is switched to OFF When an automatic trip operation occurs When a manual trip is initiated with a push-to-trip button All of the above 6 In order to divide and extinguish the arc, a deionization process must occur. True False 7 The means to open and close the contacts on a molded case circuit breaker is provided by the _____________. Arc extinguishers Trip units Operating mechanism Molded case or frame 8 Molded case circuit breakers are tested and rated according to the UL 489 standard. True False 9 Interphase barriers provide higher electrical ratings on the circuit breaker poles. True False 10 Circuit breakers must be derated for voltage, current, and interrupt ratings at altitudes above ________ feet. 1,000 5,000 6,000 10,000 The don't need derating 11 A rating plug is also called an interchangeable trip unit. True False 12 The trip unit provides quick-make, quick-break and trip-free operation of the molded case circuit breaker. True False 13 Molded case circuit breakers are designed to provide circuit protection in _______________. High voltage distribution systems Low voltage distribution systems Both high and low voltage systems 14 A device bolted to the load end of a molded case circuit breaker, that will trip only when a very high fault is encountered, is the ___________________. Current limiter Ground fault protector Voltage limiter Under voltage release 15 The NEC allows a breaker to be applied to a maximum of _________ of its continuous current rating. 60 75 80 90 99 16 If the ambient temperature of a circuit breaker falls below 40°C, the breaker will carry _________ current. More Less The same 17 Molded case circuit breakers with electronic trip units are being replaced by breakers with thermal magnetic trip units. True False 18 he handle gives an indication of the contacts status -- open, closed or tripped. True False 19 In a single-phase condition, current to the motor in the remaining phases ___________. Increases significant Decreases significant Remains the same 20 NEMA and local electric codes determine the proper selection of an enclosure type for a particular application. True False

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