AnytimeCE



WA Elec. – Answer all questions - 50% of the following will appear in random order with random answers - required by WA LNIQuiz #1 The provisions of this article (440) apply to electric motor-driven air-conditioning and refrigerating equipment and to the branch circuits and controllers for such equipment. It does not apply to_______.hermetic motorssemi-hermetic motorsabsorption refrigerationrefrigeration The provisions for special considerations necessary for circuits supplying _________ .semi-hermetic motorshermetic compressor motorsopen type compressor motorslarge horse power motors A fully enclosed motor and compressor in the same welded shell______________.prevents refrigerant leakagemotor prevents overheatinglessens belt replacementallows for easy repair A hermetic motor compressor ______ .has belt driveis external to the compressoris pained green in coloris in a welded compressor bodyNone of the answers provided Semi-hermetic compressors have direct connection to the motor, but the sealing is accomplished by bolting machined parts together, which allows for _____________.easy refrigerant replacement and maintenanceeasy belt replacement and maintenancethe unit to be dismantled for maintenance and limited parts replacementbetter leak prevention Open type compressors have a __________.bolted together motor and compressor welded together motor and compressorno motor neededseparate motor and compressorArticle 440 is in addition to requirements that are found in Article 430 Motors.TrueFalse Many requirements in 440 are the same as those found in 430 for ________ .disconnecting meanssizing of conductorscontrollers and other devicesA, B, and CThe value of branch-circuit selection current will always be equal to or greater than the marked _________.rated-load current.run load ampsfull load ampsovercurrent protective device] The branch-circuit selection current is sometimes referred to as _______.maximum circuit capacityminimum circuit capacityrated load currentfull load Amps An LCDI or leakage current detection interrupter is ______. an GFCIan ELCIa Fuse protectoran Arc Faultused to sense an breakage in the power supply cord Definition: The current of a hermetic refrigerant motor-compressor resulting when it is operated at the rated______ .frequencyloadvoltageall of the above Definition: The current of a hermetic refrigerant motor-compressor resulting when it is operated at the rated ________ value beyond which the machine will not operate according to its manufactured standard.minimumlowestmiddlemaximum Article 440 is used as ____ to Article 430 (motors).an exceptioninstead of as an alternate an addition to The rules of Articles_____ ,or_____, or ____, as applicable, shall apply to air-conditioning and refrigerating equipment that does not incorporate a hermetic refrigerant motor-compressor.496, 501 and 569495, 557 and 568422, 424, and 430491, 668, and 568Household refrigerators and freezers, drinking-water coolers and beverage dispensers are considered by the Code to be appliances, and their application must comply with _______and must also satisfy _______, because such devices contain sealed motor-compressors (hermetic ).Article 110 , 420Article 422, 440Article 420, 424Article 110, 430Quiz # 2Hermetic refrigerant motor-compressors, circuits, controllers, and equipment shall also comply with the applicable provisions of ___________ .Table 760.176(G)Table 440.3 (D)Table 690.31(E)Table 685.3A hermetic refrigerant motor-compressor shall be provided with a nameplate that shall indicate the __________ .phase voltsfrequencyA, B, and CNone of the answers provided.Multi-motor and combination-load equipment shall be provided with a visible nameplate marked with the maker's name, the rating in volts, frequency and number of phases, ______________________ , and the short-circuit current rating of the motor controllers or industrial control panel. the minimum supply short- circuit conductor ampacitythe max short circuitmax. ground faultA, B, and CThe locked-rotor current of each single-phase motor-compressor having a rated-load current of more than 9 amperes at 115 volts, or more than 4.5 amperes at 230 volts, and _______shall be marked on the motor-compressor nameplate. each poly-phase motor-compressoreach 2-horse and above motor-compressoreach hermetic motor compressoreach non-hermetic motor-compressorWhere a thermal protector complying with 440.52(A)(2) and (B)(2) is used, the motor-compressor nameplate or the equipment nameplate shall be marked with the words “ ____________.”protected motorheat switchheat protected motorthermally protectedThe ampacity shall be calculated by using Part IV, and counting all the motors and other loads that will be ___________ .run continuouslyoperated separately operated at the same timenone of the aboveThe manufacturer will multiply the maximum expected ampacity load of 14.0 amps x 1.25 to determine the minimum supply circuit conductor ampacity rating needed for this device = 18.5 amps. What breaker would be used?15 amp20 amp30 ampnone of the above Minimum supply circuit conductor ampacity is supplied by the _________. electricianbuilding contractorownermanufacturer If installed in a_________, then Short Circuit Rating is NOT required on the nameplate.high rise apartmentsingle family houseconvenience store grocery storenone of the answers providedAs long as the HVAC equipment has a short-circuit current rating equal to or greater than the available short circuit current, then the installation complies with NEC 110.10.TrueFalse(For Exception No. 1: a multi-motor and combination-load equipment that is suitable under the provisions of this article for connection to a (440.4 B) single 20 ampere, _________, single phase branch circuit shall be permitted to be marked as a single load.120 volt208 volt240 voltnone of the above A controller shall be marked with _________ .manufacturer's name, trademark, or symbol?identifying designationvoltage, phasefull-load and locked-rotor current ratingsuch other data as may be needed to properly indicate the motor-compressor for which it is suitableA, B, C, D, and EA controller is a device or group of devices that serves to govern, in some predetermined manner, the electric power delivered to the apparatus to which it is connected.TrueFalseFor a hermetic refrigerant motor-compressor, the rated-load current marked on the nameplate of the equipment in which the motor-compressor is employed shall be used in determining the rating or ampacity of : separate motor overload protectionthe disconnecting meansthe controllerthe branch-circuit short circuitAll of the answers providedWhere no rated-load current is shown on the equipment nameplate, the rated-load current shown on the ____________ shall be used. controller name platecompressor nameplatemotor nameplateall the aboveQuiz # 3Where so marked, the ________ shall be used instead of the rated-load current to determine the rating or ampacity of the disconnecting means, the branch-circuit conductors, the controller, and the branch-circuit short-circuit and ground-fault protection. branch-circuit selection currentminimum circuit ampacityneither A or Beither A or BFor cord-and-plug-connected equipment, the name plate marking shall be used in accordance with 440.22(B)TrueFalse The nameplate marking of cord-and-plug-connected equipment rated not greater than __________ shall be used in determining the branch-circuit requirements, and each unit shall be considered as a single motor unless the nameplate is marked otherwise.208 VAC, 3 phase120 VAC, 1 phase250 VAC, 1 phasenone of the answers providedFor multi-motor equipment employing a shaded-pole or permanent split-capacitor-type fan or blower motor, the full-load current for such motor marked on the nameplate of the equipment in which the fan or blower motor is employed shall be used instead of the __________ .phasehorsepower ratingvoltsfrequencyThe highest rated (largest) motor shall be considered to be the motor that has the highest rated load current.TrueFalseWhere two or more motors have the same highest rated load current, ________ shall be considered as the highest rated (largest) motor.only one of themall of themsum of all divided by that sumnone of the above] ________, the branch-circuit selection current shall be used instead of the rated load current in determining the highest rated (largest) motor-compressor.At the electrician’s discretionWhen it is largestWhere so markedNone of the above Even if motors are located remotely, they can be considered a __________ . separate system dual machinesingle machineall of the above _________ must be installed in a metallic raceway that uses non-threaded fittings.Extra heavy weight screwsExtra strength compression fittingsA grounding conductorBoth A and BWhich of the follow cannot be threaded?EMTRMCGRCIMCnone of the answers providedA motor controller short-circuit rating must be ________ the short-circuit rating of the equipment.Greater thanLess thanEqual thannone of the aboveShort Circuit Current Rating?(SCCR) is a?rating?on components and assemblies representing the _________ level of?short-circuit current?that a component or assembly can withstand.minimum maximum lowest all the aboveQuiz 4The provisions of Part II are intended to require disconnecting means capable of disconnecting air-conditioning and refrigeration equipment, including motor-compressors and controllers from the circuit conductors.TrueFalseHorsepower is used to determine ________ .A conductor’s size for the motorthe size of fuses and breakers for Short- Circuit protectionthe size of fuses and breakers for Ground-Fault protectionall the aboveEquivalent Horsepower If the total amount of a motors FLC or RLA is 19 amps and the minimum supply circuit conductor ampacity is 21 amps. Which value should be used?1921The average of the two valuesnone of the answers provided Equivalent Horsepower.)[pg.65] In case different horsepower ratings are obtained when applying NEC tables, a horsepower rating of the ________ of the values obtained shall be selected.smallerlargersumnone of the answers For small motor-compressors not having the locked-rotor current marked on the nameplate, or for small motors not covered by Table 430.247, Table 430.248, Table 430.249, or Table 430.250, the locked-rotor current shall be assumed to be ________ the rated-load current.three timesfour times five timessix timesEvery disconnecting means in the refrigerant motor-compressor circuit between the point of attachment to the feeder and the point of connection to the refrigerant motor-compressor shall comply with the requirements of ________ . 430.247440.12430.109none of the aboveFor cord-connected equipment such as room air conditioners, household refrigerators and freezers, drinking water coolers, and beverage dispensers, a separable connector or an attachment plug and receptacle shall be permitted to serve as the ________ .TrueFalse Disconnecting means shall be located _______ and readily accessible from the air-conditioning or refrigerating equipment.on the equipmentwithin sight fromwithin the roomwithin 100 ft. of the equipmentA quick definition of Readily Accessible would be: Easy to reach without using a ladder or overcoming any obstacles. TrueFalseDisconnecting means shall be located ______ from, and readily accessible from the air-conditioning or refrigerating equipment.within reach ofwithin 100 ft ofwithin sight ofnone of the above The disconnecting means shall not be permitted to be installed on or within the air-conditioning or refrigerating equipment.True False A 125-volt, single-phase, 15- or 20-ampere (GFCI)-rated receptacle outlet shall be installed at an accessible location for the servicing of heating, air-conditioning, and refrigeration equipment. The receptacle shall be located on the same level and within ________ of the equipment .10 feet of 15 feet25 feet50 feet If a disconnecting means is required to be lockable open elsewhere in this Code, it shall be capable of being locked in the open position. TrueFalseWhere an attachment plug and receptacle serve as the disconnecting means in accordance with 440.13, their location shall be accessible but shall not be required to be _________________.Less than 25 feet of an outletreadily accessiblelockablewhite in colorQuiz 5When an air conditioning is listed by a qualified electrical testing laboratory with a nameplate that reads “maximum fuse size,” the listing restricts the use of this unit to fuse or circuit breaker of like size.TrueFalse The correct method of wiring when the nameplate specifies that fuses are to used to protect the equipment is________ .Circuit breaker, fused switch, equipment Circuit breaker, fused switch, fuseless switch, equipment Circuit breaker, fused switch, circuit breaker, equipmentAll the answers providedWhere the protection specified is not sufficient for the starting current of the motor, the rating or setting shall be permitted to be increased but shall not exceed ______ of the motor rated load current or branch-circuit selection current, whichever is _____ . 225 percent, greater175 percent, greater225 percent, lesser 175 percent, lesserThe rating of the branch-circuit short-circuit and ground fault protective device shall not be required to be less than 20 amperesTrueFalse5. A protective device shall have a rating not exceeding 175 percent of the motor-compressor rated-load current or_______, whichever is greater.locked rotor amps:full-load-amperagebranch-circuit selection currentnone of the above37839656985*Standard sized fuses and breakers: 10, 15, 20, 25, 30, 35, 40, 45, 50Round down to nearest fuse size. The following questions will involve solving for the fuse size.00*Standard sized fuses and breakers: 10, 15, 20, 25, 30, 35, 40, 45, 50Round down to nearest fuse size. The following questions will involve solving for the fuse size.6. Given an Ice machine RLA = 8.5 amps @ 230 volts and prep table 6.5 amps @ 230 volts. What is the fuse size at 175%?152025307. Given an ice machine RLA = 8.5 amps @ 230 volts and prep table 6.5 amps @ 230 volts. What is the fuse size when motor will not start at standard.403530258. Given an ice machine branch circuit selection current that equals 17 amps and a food preparation table at 14 amps, what fuse size is needed?1520253035Quiz 61.For a wye-start, delta-run connected motor-compressor, the selection of branch-circuit conductors between the controller and the motor-compressor shall be permitted to be based on _______ of either the motor-compressor rated-load current or the branch-circuit selection current, whichever is greater. 50%125%72%58%225%2.When a motor first starts, the current is equal to LRA, but then _______.the motor shuts down when the breaker is trippedamperage drops as the motor speed increasesthe motor speed decreases in order to reduce the currentamperage increases as the motor speed increasesthe motor is likely to overheat3.Motor windings in a delta configuration _______.are arranged in a “Y” shapeprovide low starting torqueare arranged in an “S” shapeprovide high starting torqueare found in most compressors rated greater than 20 tons4.To limit the starting current surge and the disturbance of voltage on the supply lines, large induction motors are started at reduced voltage and can then be increased to full supply voltage when at full rotating speed. TrueFalse5.Wye configuration current is approximately _______ of delta configuration LRA.10%20%30%50%57.8%6.Motor windings in the _______ configuration have a lower manufacturing cost because less insulation is required around the windings.deltaSwyeroundX7.3-phase motor windings in a wye configuration is ideal for _______ a motor-compressor.running maintainingcleaningoverheatingstarting8.3-phase motor windings in a _______ configuration are ideal for running a motor-compressor.QwyeXdeltaZ9.The individual motor circuit conductors of wye-start, delta-run connected motor-compressors carry 58 percent of the _______.rated-load currentLRArated voltagebranch-circuit selection currentconductor resistance10.The ampacity of a conductor supplying a motor-compressor marked with branch-circuit rating = 28 amps and RLA = 20 amps must be no less than _______.18 amps20 amps33 amps28 amps48 amps11.The ampacity of a conductor supplying a motor-compressor marked with branch-circuit rating = 15 amps and RLA = 7.5 amps must be at least _______.7.5 amps16.9 amps15 amps30 amps22.5 amps12.Where the circuitry is interlocked so as to prevent the starting and running of a second motor-compressor or group of motor-compressors, the conductor size shall be determined from the _______ motor-compressor or group of motor-compressors that is to be operated at a given time.smallest firstlargestlastnewest13.The branch-circuit conductors for _______ shall be in accordance with Part VII of Article 440.beverage dispenserssemi-hermetic motor compressorshousehold freezersroom air conditionersindustrial air conditioners14.The ampacity of the conductors supplying multimotor and combination-load equipment shall not be less than the _______ marked on the equipment in accordance with 440.4(B).rated voltageanticipated resistanceLRAmaximum OCPD ampsminimum circuit ampacityQuiz 7 1) A motor-compressor’s nameplate is marked with RLA = 20 amps and branch-circuit rating of 28 amps. Which of the following is required of the motor-compressor’s controller?The FLC and LRA ratings must be 28 amps or greater.The locked-rotor current must be no less than 48 amps.The full-load current rating must be greater than 20 amps.The FLC and LRA ratings must be 20 amps or greater.None of the answers provided.2) In a case where a motor controller is rated in _______ but is without a continuous-duty full-load current rating and/or a locked-rotor current rating, an equivalent FLC must be determined from Table 430.248, Table 430.249, and Table 430.250.a foreign languagea voltage rangehorsepowerfrequencyamperes3) A separate overload relay protecting a motor-compressor must be selected to trip at _______ of the motor-compressor rated-load current.at least 120%no more than 110%approximately 150%not more than 140%exactly 136%4) A protector approved for use with the motor-compressor to prevent dangerous overheating from overload or failure to start is _____________.a Mag-starteran Internal thermal protectoran Inverse-time circuit breakerprotective systemAll of the answers provided440.52(A)(3) [p. 145]5) An inverse-time circuit breaker protecting a motor-compressor must have a rating of not more than _______ of the motor-compressor rated-load current.110%140%125%225%130%6) A motor-compressor controller, disconnecting means, and branch-circuit conductors must be protected against _______ due to motor overload and failure to start.excessive vibrationovercurrentundercurrentresistancedevice failure7) A motor-compressor overload protective device shall be identified for installation with the short-circuit and ground-fault protective device for the branch circuit to which the equipment is connected.TrueFalse8) The rating of cord connector overload protection for equipment used on a 20-ampere, 120-volt single-phase branch circuit shall not exceed _______ amperes at 125 volts.15182510209) The _______ of a room air conditioner shall be connected to the equipment grounding conductor in accordance with 250.110, 250.112, and 250.114.fanattachment plugenclosurescontrol dialmounting screws10) Which of the following is not a requirement for considering a room air conditioner to be a single motor unit when determining its branch circuit requirements?It is cord- and attachment-plug connected.The rating of the branch-circuit short-circuit and ground-fault protective device does not exceed the ampacity of the branch-circuit conductors or the rating of the receptacle, whichever is less.Its rating is more than 250 volts.Its rating is not more than 40 amperes and 250 volts, single phase.Total rated-load current is shown on the room air conditioner nameplate rather than individual motor currents.11) A 30-amp branch circuit supplying only a cord- and attachment-plug-connected room air conditioner is permitted to serve an air conditioner load of _______.at least 24 ampsno more than 24 ampsas much as 30 amps24 to 30 ampsnone of the answers provided12) The total marked rating of a cord- and attachment plug-connected room air conditioner shall not exceed _______ percent of the rating of a branch circuit where lighting outlets, other appliances, or general-use receptacles are also supplied.35225755010013) An attachment plug and receptacle shall be permitted to serve as the disconnecting means for a single-phase room air conditioner rated 250 volts or less if the manual controls on the room air conditioner are readily accessible and located _______.within 6 feet of the floorin the same room as the air conditionerat least 18 inches above the flood lineon the air conditioner’s enclosurewithin arm’s reach of the floor14) Where a flexible cord is used to supply a room air conditioner, the length of such cord shall not exceed _______ for a nominal, 120-volt rating6 feet36 inches10 feet60 inches20 feet15) Which of the following factory-installed devices is not a permissible protection device for a single-phase cord- and plug-connected room air conditioner?LCDIAFCIHDCIAFDInone of the answers provided ................
................

In order to avoid copyright disputes, this page is only a partial summary.

Google Online Preview   Download