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187 Cards in this Set
- Front
- Back
- 3rd side (hint)
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electric heating appliances employing resistance-type heating elements rated more than _____ amps shall have the heating elements subdivided. |
A. 48 amps. 424.22(B) |
Electric heating appliance |
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The wire-pulling compounds that increase the dielectric constant shall not be used on the_____ of the isolated power supply in a health care facility.
A. derived conductors B. primary conductors C. secondary conductors D. circuit conductors |
C. secondary conductors. 517.100 (A)(6)
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health care facility |
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A 3000 square foot house would have a minimum of ______ 15 ampere general lighting branch circuits.
A. no limit B. no minimum C. five D. six |
C. five 220.12
3000×3= 9000÷15= 600÷120= 5 |
minimum
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Where communication cables are installed in a raceway the raceway can be filled:
A. to 20% B. to 40% C. to 60% D. none of these |
D. None of these 800.110(B)
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Communication cables
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The disconnecting means for hermetic refrigerant motor compressor shall be selected based on ____.
A. nameplate full load current B. Rated load current C. Branch circuit selection current D. B or C whichever is greater |
D. B or C whichever is greater 440.12 (A)
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A bushing is required where raceways containing conductors #4 or larger ungrounded conductors enter a cabinet, box enclosure or Raceway. it shall be
A. blue B. insulating C. Substantial fitting D. rounded |
B. insulating 300.4 (G)
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A feeder conductor designed to limit voltage drop to ______ will provide reasonable efficiency of operation.
A. 2% of load voltage B. 2% of source voltage C. 3% of load voltage D. 3% of source voltage |
C. 3% of load voltage 215.2 (A)(4)
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The bending space needed where a #3 TW copper conductor enters a gutter on the top and exits through a sidewall is.
A. Not specified B. 1 inch C. One and a half inches D. 2 inches |
D. 2 inches. Table 312.6 (A)
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A non heating lead for a heating cable colored blue is designated _______.
A. 120 volts B. 208 volts C. 240 volts D. 277 volts |
B. 208 volts. 424.35 (2)
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The minimum grounding electrode conductor for a 200 amp service fed by a #4/0 THW copper service conductor is ______.
A. #8 B. #6 C. #4 D. #2 |
D. #2 table 250.66
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Lifted and labeled equipment shall be installed in accordance with _______.
A. Manufacturer's promotional literature B. Architectual specifications C. Listing instructions D. Quotation details |
C. Listing instructions 110.3 (B)
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Concrete, brick or tile walls shall be considered as ______ when calculating working space requirements.
A. Grounded B. Insulated C. Isolated D. Combustible |
A. Grounded. 110.26 (A)(1)(C-2)
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The screw shell conductor may be colored ______.
A. green B. gray C. black D. blue |
B. gray. 200.10 (D)
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Circuit breakers may be field assembled in parallel.
A. true B. false |
B. false 240.8
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Plug fuses of 20 ampere and lower rating shall be identified by a ______ configuration.
A. hexagonal B. octagonal C. round D. none of these |
D. None of these. 240.50 (C)
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A box shall be installed at each of the following conductor splice points except _______.
A. junction point B. pull point C. temporary light point D. switch point |
C. temporary light point. 300.15
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All 125 volt single phase 20 amp receptacles installed in aircraft hangers used for electrical hand tools shall have ground fault circuit interrupter protection for _________.
A. power tools B. diagnostic equipment C. personnel D. aircraft circuits |
C. personnel. 513.12
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The code limits the ampacity of a #10 THW copper conductor in a wet location to _______ amps.
A. 35 B. 30 C. 25 D. none of these |
A. 35 amps
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in a multiple-occupancy residential building, each occupant shall have access to the main service disconnecting means.
A. true B. false |
A. true. 230.72 (C)
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what size aluminium conductor is the minimum permitted for a 400 amp single-phase dwelling service?
A. 400 kcmil B. 500 kcmil C. 600 kcmil D. 750 kcmil |
C. 600 kcmil. 310.15 (B)(7)
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flexible metal conduit shall not be used in this location.
A. where subject to physical damage B. exposed C. concealed D. surface location |
A. where subject to physical damage
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where a circuit breaker is used to switch a lighting load, the center grip of the handle, when in its highest position, will not be more than ______ above the floor.
A. 6' B. 6' 3" C. 6' 6" D. 6' 7" |
D. 6' 7" 404.8 (A)
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where it is found that a ceiling fan weighs 35 pounds, the following statement is true
A. it must be supported independently of the outlet box B. it may be supported by an outlet box C. it may be supported by an outlet box identified for such use D. it must be supported independently from the outlet box identified for such use. |
C. it may be supported by an outlet box identified for such use.
314.27(C) |
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what is the ampacity of a #3 THW copper conductor in a dry location?
A. 65 B. 85 C. 100 D. 123 |
C. 100 310.15 (B)(16)
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where an optical fiber cable is entering the building from the outside in duct, it shall be terminated and _____ at the point of entrance.
A. tagged B. identified C. transitioned D. firestopped |
D. firestopped. 770.26
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There are _______ uses permitted for electrical nonmetallic tubing and _______ uses not permitted respectively.
A. 8, 10 B. 9, 7 C. 6, 6 D. 9, 6 |
A. 8, 10. 362.12
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Countertop spaces in a residential dwelling kitchen separated by range tops, refrigerators or ______ shall be considered as separate countertop spaces.
A. appliance garages B. sinks C. fixed appliances D. tombstone receptacles |
B. sinks. 210.52 (C)(4)
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The minimum number of 15 ampere circuits to supply lights and receptacle outlets in a recreational vehicle is:
A. none B. one C. two D. three |
C. two. 551.42 (A)
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A raceway not permitted for service entrance conductors is ______?
A. surface metal raceway B. electrical nonmetallic tubing C. liquid tight flexible nonmetallic conduit D. wireway |
A. surface metal raceway. 230.43
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The frame of an existing clothes dryer branch circuit may be permitted to be grounded to the grounded circuit conductor in certain situations.
A. true B. false |
A. true. 250.140
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A single receptacle supplying a permanently installed sump pump in an elevator pit _______ ground fault circuit interrupter protection.
A. Shall be provided with B. shall require C. shall not require D. Shall not be provided with |
C. Shall not require. Article 620.85
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Service conductors run above a window of a residential dwelling are considered properly installed even if separated by only 2 inches. |
A. true. Article 230.9 (A) Exception
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Lightning protection system ground terminals shall be bonded to the ______ grounding electrode system.
A. made B. building or structure C. municipal D. both A and C |
B. building or structure. Article 250.106
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On emergency systems, automatic transfer switches shall be electrically operated and ______.
A. Provided with a manual reset B. manually activated C. mechanically held D. of the indicating type |
C. mechanically held. Article 700.5 (C)
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The maximum subdivided load permitted for resistance elements is_____ amps.
A. 60 B. 58 C. 50 D. 48 |
D. 48 amps. Article 424.22 (B)
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The maximum number of 20 amp 125 volt circuit to supply lights, receptacle outlets and fixed appliances in a recreational vehicle is _______.
A. 3 B. 4 C. 5 D. no limit |
C.5 Article 551.42 (C)
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Which types of equipment must be GFCI protected
A. storable pools B. therapeutic tubs C. fountain equipment D. All the above |
D. All the above
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Which one of the following code references would you use to determine the proper overcurrent protection for an AC condenser motor.
A. 440.22 (A) B. 430.148 C. 424.17 D. 310.16 (A) |
A. 440.22 (A)
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Nails are not permitted to pass through the interior of an enclosure. |
B. false. Article 314.23 (B)
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The third conductor in flexible cords and cables shall be used for equipment grounding purposes only.
A. true B. false |
A. true. Article 400.4 note 8
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Which of the following conductors is NOT suitable for use where 75 degree C conductors are required.
A. XF B. TFFN C. TFN D. TFF |
D. TFF. Article 402 table 402.3
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Where are exposed to weather, raceways enclosing service entrance conductors shall be suitable for wet locations and ________.
A. rainproof B. arranged to drain C. weatherproof D. weathertight |
B. arranged to drain. Article 230.53
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An inspector finds a green #10 THWN copper conductor pulled in a 2 #8 THWN conductors to supply power to a heater protected by a 40 amp breaker the inspector will this _______ installation. |
A. approve. 250.122
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Overcurrent for #22 AWG conductors used in instrumentation tray cable shall not exceed ______.
A. 2 amperes B. 3 amperes C. 4 amperes D. 5 amperes |
B. 3 amperes. Article 727.9
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Network powered broadband communications systems cables shall have a clearance from ground above public alleys of _________ feet. |
C. 15 1/2. Article 830.44 (c)(3) |
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What size pull box is minimum for a straight pull of 2 500 kcmil conductors 1 350 kcmil conductor and 1 1/0 conductor if a 3" Raceway is used.
A. 18" B. 20" C. 22" D. 24" |
D. 24". Article 314.28 (A)(1)
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The closest that a switch for a pool light can be located to the inside wall of a pool is _______.
A. 10' B. 5' C. no limit D. not permitted by the pool |
B. 5'. Article 680.22 (c)
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A hermetic seal may be made by ________.
A. soldering B. brazing C. both A and B D. none of the above |
C. both A and B. Article 500.2
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The total load on any overcurrent device located in a panel panelboard shall not exceed _______ % of its rating where the load will continue for 3 hours or more.
A. 80 B. 100 C. 125 D. none of these |
D. none of these. Article 210.20 (a)
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An appropriate flexible cord to be used with a charger for an electric vehicle is type ________.
A. SJTT B. SJT C. EVTT D. EVT |
D. EVT. Article 400.4
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A GFCI receptacle outlet is required in every residential garage.
A. true B. false |
A. true. Article 218.8 (a)
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The smallest allowable TW copper conductor for 120 volt 4500 watt electric water heater is_______.
A. #12 B. #10 C. #8 D. #6 |
D. #6
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An open fuse has ______ resistance.
A. no B. low C. closed D. high |
D. high. common knowledge
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Nonmetallic sheathed cable is covered in which chapter of the NEC.
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Chapter 3 wiring Methods
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A #6 RHW without outer cover must be allowed _____ cubic inches for box fill calculations.
A. 2 B. 2.25 C. 2.5 D. 5 |
D. 5. Article 314.16(b)
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A 3 way switch is _____.
A. spst B. spdt C. dpdt D. dpst |
B. spdt. common knowledge
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In a 1/2 EMT Raceway with a black and white conductor, the white conductor is named the __________ conductor.
A. Grounded B. neutral C. grounding D. all of the above |
A. Grounded. common knowledge & definitions 100
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Order the thickness of insulation from thinnest to thickest for #12 AWG copper.
A. TW, THW, THWN B. THW, TW, THHN C. THHN, TW, THW D. THWN, TW, THW |
C. THHN, TW, THW. Article 310.104
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Order the size of lamp holders from smallest to largest. |
B. admedium, medium, candelabra.
common knowledge. |
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A 15 amp single receptacle may be used on a #12 copper conductor circuit of 20 amps if it is the only outlet.
A. true B. false |
B. false. Article 210.19(a)(1)
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A fitting ______.
A. Performs a mechanical function B. Performs the mechanical and electrical function C. Performs an electrical function D. Performs a solid function |
A. Performs a mechanical function
Article 100 |
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The expected output of a 10:1 step down transformer with a 240 volt input is _____.
A. 24 volts B. 48 volts C. 120 volts D. 2400 volts |
A. 24 volts.
common since question |
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On a moving walkway, the disconnecting means shall be installed ________.
A. Not closer than 20 feet or more than 100 feet B. In sight of the walkway C. In the space where the controller is located D. where practicable |
D. where practicable
Article 620.51(c) |
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If the resistance of a circuit is cut in half and the applied voltage kept constant, the current will be ______?
A. unchanged B. doubled C. quadrupled D. cut in half |
B. doubled common knowledge |
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A #14 TW aluminum conductor is ______ circular mils.
A. 10380 B. 6530 C. 4110 D. 2240 |
C. 4110 ch 9 tbl 8 |
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A lamp has a source voltage of 110 volts and a current of 0.9 amps. What is the resistance of the lamp?
A. .08 ohms B. .008 ohms C. 12.22 ohms D. 122.22 ohms |
D. 122.22 ohms E=IxR R=E/I |
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In a residential dwelling unit, each duplex receptacle counts as 360 VA and each single receptacle counts as 180 VA.
A. True B. False |
B. False article 220.14(I) |
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On an electric service with 2 paralleled 3/0 THW copper conductors for a 400 amp service, the proper grounding electrode is _______?
A. 1/0 Al B. 1/0 Cu C. 2/0 Cu D. 4/0 Al |
A. 1/0 Al article 250.66 |
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Service-entrance conductors to buildings shall not be smaller than ______?
A. 12 AWG B. 8 AWG C. 4 AWG D. 2 AWG |
B. 8 AWG Article 230.23(B) |
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A flexible cord used to supply a room air conditioner shall not exceed 6' if connected to a 120 volt rated unit.
A. True B. False |
B. False Article 440.64 |
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The switch for an attic light near near equipment requiring service shall be located ______.
A. on a pull chain B. with a duplex recptacle C. in the attic space near the equipment. D. at the usual point of entry into the attic. |
D. at the usual point of entry into the attic. Article 210.70(A)(3) |
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vegetation such as trees may be used for support of overhead conductor spans.
A. True B. False |
B. False common knowledge but also found in Article 230.10 |
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A floating building floats on water and _____.
A. is connected by a flexible means. B. is served by one set of service conductors. C. is moored in a permanent location. D. All the above |
D. All the above Article 553. 2 |
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Bend in SE cable shall be such that the radius of the curve of the inner edge of any bend shall not be less than ______ times the diameter of the cable.
A. 2 B. 3 C. 5 D. 6 |
C. 5 Article 338.24 |
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Electrical nonmetallic tubing shall not be used in how many situations?
A. 4 B. 6 C. 8 D. 10 |
D. 10 Article 362.12 |
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In a health care facility, the alternate source of power required may be a(n) ______
A. separate service drop B. A duel rated primary service C. battery system D. none of these |
C. battery system Article 517.35(B)(4) |
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A watertight enclosure is constructed so that moisture will not _______.
A. enter B. interfere with successful operation. C. penetrate D. percolate |
A. Enter Article 100 |
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The ampacity of a #6 copper conductor in an NM cable servicing a continuous load is _______.
A. 55 amps B. 60 amps C. 65 amps D. 75 amps |
D. 75 amps Table 310.15 |
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Raceways shall be installed complete between outlet junction or splice points prior to the installation of conductors.
A. True B. False |
A. True Article 300.18(A) |
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When a 20" run of 3/4"rigid nonmetallic schedule 40 conduit is found to contain a total of 6 #10 THWN copper conductors, the inspector will _______ the installation.
A. Approve B. Fail |
A. Approve Annex C Table C.10 |
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An AC transformer welder shall have an OCPD rated or set at not more than ______% of the primary current of the welder.
A. 125% B. 80% C. 300% D. 200% |
D. 200% Article 630.12(A) |
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The demand load for a circuit that has a 5 kW heat strip and a 5 HP, 240V compressor is ______W.
A. 3250W B. 5000W C. 6720W D. 6250W |
C. 6720W I cant find the calculations to show the work. |
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______ conductors are service conductors installed between the weather head and the service equipment.
A. Lateral B. Drop C. Service entrance D. Service tap |
C. Service entrance Article 100 |
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Conduits through which moisture may contact energized parts shall be _____ at either or both sides.
A. Open B. Arranged to drain C. Sealed D. Threaded |
C. Sealed Article 300.5(G) |
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Improper makeup of splices and connections _______.
A. Violates NEMA standards B. Violates ANSI standards C. Causes heat D. Increases circuit capacitance |
C. Causes heat Trade knowledge. |
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A string of outdoor lights that is suspended from two points is _______ lighting.
A. Outline B. Carnival C. Festoon D. Car Lot |
C. Festoon Article 100 |
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The grounded conductor is ______ in color.
A. Green B. Gray C. Orange D. Black |
B. Grey Article 100 Trade knowledge |
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Hallways in a dwelling unit ___' or more in length are required to have a receptacle outlet.
A. 5' B. 8' C. 10' D. None of the above |
C. 10' Article 210.52(H) |
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Bathroom receptacles in a dwelling unit shall _______.
A. Be supplied by one 20 amp circuit. B. Be GFCI protected C. Have no other outlets D. All the above |
D. All the above Article 210.8(A)/210.11(C)(3) |
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Receptacles for rooftop A/C units shall be located within _______ of the unit.
A. 25' B. Insight C. 50' D. 75' |
A. 25' Article 210.63 |
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______ is not a standard ampere rating for fuses.
A. 35A B. 50A C. 40A D. 55A |
D. 55A Article 240.6(A) |
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One horse power is equal to _______ W.
A. 647W B. 476W C. 746W D. 674W |
C. 746W Trade knowledge |
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LFMC shall be fastened within _____" of a box.
A. 8" B. 12" C. 10" D. 6" |
B.12" Article 350.30(A) |
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In class 1, division 1 and 2 locations, the sealing compound shall not be less than the trade size of the seal fitting and no case less then _____".
A. 5/8" B. 1/2" C. 3/4" D. 3/8" |
A. 5/8" Article 501.15(C)(3) |
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A disconnect requiring an extension ladder for service is considered ______.
A. Isolated B. Readily excessable C. Unguarded D. Restricted |
A. Isolated Article 100 |
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A 300W, 130V incandescent lamp draws _____A.
A. 3A B. 2.1A C. 2.6A D. 2.3A |
D. 2.3A Calculation W/V=A 300W/130V=2.3A
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Current is defined as the flow of ________.
A. Protons B. nuetrons C. ohms D. Electrons |
D. Electrons Common knowledge |
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An electrical circuit has 10 A of current and a resistance of 58 ohms. The voltage is ______V.
A. 48V B. 68V C. 580V D. None of the above |
C. 580V Calculation AxR=V 10Ax58ohms=580V |
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A 120V heating element rated at 2200W draws ______A.
A. 18.3A B. 1.83A C. 20A D. 15A |
A. 18.3A Calculation W/V=A 2200W/120V= 18.3A |
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D.P.D.T letters would be used to identify a ______.
A. Raceway B. Switch C. Circuit breaker D. Conductor insulation |
B. Switch Common knowledge |
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What is the internal diameter of a 1/2" liquidtight flexible nonmetallic conduit? (Type LFNC-A)
A. 0.312" B. 0.495" C. 0.630" D. 0.632" |
C. 0.630 Chapter 9 Table 4 |
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When 3 light bulb are wired in a single fixture, the are connected in _______.
A. Series-Parallel B. Series C. Parallel D. None of these |
A. Series-Parallel Common knowledge |
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Approved is _______.
A. UL listed only B. Listed and labeled equipment C. Acceptable to the authority having jurisdiction D. Tested and approved for the purpose by a qualified testing lab. |
C. Acceptable to the authority having jurisdiction. Article 100 Common knowledge.
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Any room or location in which flammable anesthetics or volatile flammable disinfecting agents are stored shall be considered to be a ________ location from floor to ceiling.
A. Class 2, Division 1 B. Class 1, Division 1 C. Class 1, Division 2 D. Nonhazardous |
B. Class 1, Division 1 Article 500.5(B)(1) |
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In the supply circuit of X-Ray equipment, a disconnecting means of adequate capacity shall be _____.
A. At least 50% of the input required for the momentary rating. B. At least 100% of the input required for the momentary rating. C. At least 50% of the input required for the long time rating. D. At least 125% of the input required for the long time rating. |
A. At least 50% of the input required for the momentary rating. Article 660.5 |
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What is the minimum bending radius for a 7/8 - inch MI cable? A. 6 1/2 inches B. 7 inches C. 8 inches D. 8 3/4 inches |
D. 8 3/4 inches Article 332.24(2) |
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What is the minimum width of working space in front of a panel that is 16 inches wide? A. 16 inches B. 24 inches C. 30 inches D. 36 inches |
C. 30 inches Article 110.26(A)(2) |
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How many splices are permitted in the grounding electrode conductor with bolted connections? A. 0 B. 1 C. 2 D. 3 |
A. 0 Article 250.64(c) |
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Overhead conductors for festoon lighting shall not be smaller than. A. 14 AWG B. 12 AWG C. 10 AWG D. 8 AWG |
B. 12 AWG Article 225.6(B) |
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Where the number of current-carrying conductors contained in a sheet metal auxiliary gutter is_________ or less, the derating factors in 310.15(B)(2)(a) shall not apply. A. 10 B. 20 C. 30 D. 40 |
C. 30 Article 366.22(A) |
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Capacitors containing more than ____ gallons of flammable liquid shall be enclosed in a vault. A. 3 B. 5 C. 7 D. 10 |
A. 3 Article 460.2(A) |
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For what kind of lighting loads does the code state there shall be no reduction in the size of the neutral conductor? A. Motels B. dwelling units C. Hospitals D. nonlinear loads |
D. nonlinear loads Table 220.42 lighting load demand factors |
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Type MC cable shall not be used ______. A. For control circuits B. For signal circuits C. For outdoor circuits D. Where exposed to destructive corrosive conditions, unless the metallic sheath is suitable for the conditions or is protected by a material suitable for the conditions. |
D. Where exposed to destructive corrosive conditions, unless the metallic sheath is suitable for the conditions or is protected by a material suitable for the conditions. Article:330.12 |
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The grounding conductor of a coaxial cable shall be ______? A. Solid copper B. Stranded copper C. A corrosion-resistant conductor. D. Any of these |
D. any of these Article: 800.100(A)(2) |
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The neutral conductor ______. A. Carries the balanced current. B. Carries the unbalanced current. C. Is always the white grounded conductor. D. Is always the green conductor. |
B. Carries the unbalanced current. Common knowledge |
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Electric-discharge luminaires (fixtures) of less than 1000 volts that have ______ shall be installed so that there will not be any contact with combustible material. A. Transformers B. Exposed ballasts C. Exposed ballasts or Transformers. D. none of these |
C. Exposed ballasts or Transformers. Article: 410.136(A) |
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Overcurrent devices shall not be located in the vicinity of easily ignitable material, such as in ________? A. Clothes closet B. Bedrooms C. Garages D. Kitchens |
A. Clothes closet Article: 240.24(D) |
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When rerouting conduit, it may be necessary to increase the wire size, if the distance is considerably greater, in order to _____. A. Account for current drop B. Compensate for voltage drop. C. Increase the mechanical strength. D. Allow for possible resistance drop. |
B. Compensate for voltage drop. Common knowledge |
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Motors smaller than a 1/8 HP shall be marked with the rated horsepower. A. True B. False |
B. False Article: 430.7(7) |
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General Power and lighting in a health care facility ______. A. Are connected to the alternate source generator. B. Are part of the continuous power system. C. Are part of the equipment system. D. Are not part of the emergency system. |
B. Are a part of the continuous power system. Common knowledge |
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The type of disconnecting means for a motor shall be ______. A. A listed motor-circuit switch rated in HP. B. A listed molded case circuit breaker. C. A listed molded case switch. D. All the above. |
D. All the above Article: 430.109(A) |
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If completely enclosed in the motor control enclosure, 12 AWG Aluminum conductors shall be permitted to be protected with an overcurrent device that has a maximum rating of _____ Amps. A. 15 B. 20 C. 30 D.100 |
D. 100 Article: 430.72(B)(2) to table 430.72(B) |
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A generator set using internal combustion engines for legally required standby systems shall _______. A. Be provided with at least 2 hours of on site fuel. B. Have a means provided for automatic transfer and have a means provided for automatically starting the prime mover. C. Have a means provided for automatically starting the prime mover and be provided with at least 2 hours of on site fuel. D. Have a mean provided for automatic transfer and have a means provided for automatically starting the prime mover and be provided with at least 2 hours of on site fuel. |
D. Have a mean provided for automatic transfer and have a means provided for automatically starting the prime mover and be provided with at least 2 hours of on site fuel. Article: 701.12(B) |
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______ is the HP rating of an electric motor. A. Power factor % B. Torque C. Output D. Input |
C. Output Electrical Theory |
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True power equals apparent in an electrical circuit containing only ______? A. Resistance B. Capacitance C. Inductance D. Impedance |
A. Resistance Electrical theory |
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The NEC recommends a ____% VD for branch circuits. A. 2 B. 3 C. 125 D. 5 |
B. 3% Article: 210.19(A) FPN 4 |
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Water freezes at ___C and boils at ____C at sea level. A. -23;212 B. 0;212 C. -32;100 D. 0;100 |
D. 0;100 Electrical theory |
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_____ is the same in a parallel branch. A. Current B. Resistance C. Voltage D. VA |
C. Voltage Electrical theory |
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An electrical circuit has a current of 25A with a total resistance of 21 ohms. The true power of the circuit is _____ W. A. 46 B. 525 C. 13,125 D. None of the above |
C. 13,125 Pt=I^2 X R Pt=(25)^2 X 21= 13,125 |
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The output of a 5HP motor is _____ VA. A. 150 B. 1500 C. 370 D. 3730 |
D. 3730 Output= HP X 746 Output= 5 X 746 Output= 3730 VA |
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An A/H has a 10kW, 240v, 1 phase heat strip. The resistance of the heat strip is ____ ohms. A. 41.6 B. 576 C. 2.88 D. 5.76 |
D. 5.76 R= E^2/P R= (240v X 240v)/ 10,000 VA R= 57,600/ 10,000= 5.76 |
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The exact K for an uncoated #1 Cu conductor is _______ohms. A. 10.8 B. 10.4 C. 12.6 D. 12.88 |
D. 12.88 Ch 9, Table 8: #1 Cu= .154 ohms/kFt #1 Cu= 83,690 CM K= (R X CM)/1000 K= (.154 X 83,690)/1000 K= 12,888.26/1000= 12.88 |
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A 250 kcmil conductor has a circular mil area of _____. A. 0.082 B. 0.575 C. 250,000 D. 0.0535 |
C. 250,000 Ch 9, Table 8 250 kcmil= 250,000 |
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The cost of operating a 200 W lamp for 8 hours at .9 cents per kWh is $___. A. 1.44 B. 1.84 C. 0.44 D. 0.14 |
D. $0.14 Cost= (T X W X Cost/kWh)/1000 Cost= (8 X 200 X 0.09)/1000 Cost= 144/1000= 14.4 Cost= $0.14 |
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A circuit has a 4 ohm, 6 ohm, and 8 ohm resister connected in series. The total resistance is ____ ohms. A. 1.8 B. 0.542 C. 18 D. None of these |
C. 18
Rt=R1+R2+R3 Rt= 4 + 6 + 8 Rt= 18 ohms |
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A circuit has a 4 ohm, 6 ohm, and 8 ohm resister connected in parallel. The total resistance is ____ ohms. A. 1.845 B. 18 C. 0.542 D. None of the above |
A. 1.845
Rt=1/((1/R1)+(1+R2)+(1/R3)) Rt=1/((1/4)+(1/6)+(1/8)) Rt=1/(0.250+0.167+0.125) Rt= 1/0.542= 1.845 ohms |
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A 240v, 1 phase motor draws 28A and is 55% efficient. The rating of the motor is ____ HP. A. 2 B. 7.5 C. 3 D. 5 |
D. 5
HP= I X E X Eff/ 746 HP= 28 X 240 X 0.55/746 HP= 3696/746= 4.9 HP= 5 |
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The primary maximum OCPD shall not exceed _____ A for a 1.5 kVA, 120/240V, 1 phase step-up transformer. A. 20 B. 15 C. 10 D. None of the above |
A. 20A
Ip= kVA X 1000/ Ep Ip= 1500/120= 12.5 Ip= 12.5A 450.3(B), Note 1: 12.5A X 125%= 15.6 240.6: Next higher rating OCPD= 20A |
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A 40A, 240V, 1 phase branch circuit has a 210' run of #8 XHHW AL conductor rated at 75 degrees C. The VD is ___ V. (Use approximate K.) A. 7.2 B. 12 C. 15 D. None of the above |
D. 21.57V
VD= K X I X D/ CM VD= 42.4 X 40 X 210/ 16,510 VD= 356,160/16,510=21.57 VD= 21.57V |
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The total resistance in a circuit that has a 3 ohm resister connected in series with a 4 ohm and a 3 ohm resister connected in parallel is ___ohms A. 4.7 B. 13 C. 3.8 D. 6.5 |
A. 4.7 ohms
Rp= (R1 X R2)/(R1 + R2) Rp= (4 X 3)/(4 + 3) Rp= 12/7= 1.7 Rp= 1.7 ohms Rt= 3 + 1.7 Rt= 4.7 ohms |
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The total resistance in a circuit that has a 6 ohm resister connected in series with a 2 ohm, 5 ohm, and 10 ohm resistor connected in parallel is ____ ohms A. 23 B. 8.9 C. 7.25 D. 12 |
C. 7.25 ohms
Rp= 1/((1/R1)+(1/R2)+(1/R3)) Rp= 1/((1/2)+(1/5)+(1/10)) Rp= 1/(0.5+0.2+0.1) Rp= 1/0.8= 1.25 ohms Rt= 1.25+6= 7.25 ohms |
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The ampacity of a 1/2" X 4" AL busbar is ___A. A. 1000 B. 1400 C. 700 D. 1250 |
B. 1400A
Busbar ampacity= T x W x constant = 0.5 x 4 x 700 = 1400A |
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The ampacity of a 1/4" X 4" Cu busbar is ___A. A. 700 B. 1200 C. 1100 D. 1000 |
D. 1000A Busbar ampacity= T x W x Constant = 0.25 x 4 x 1000 = 1000A |
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The rating of the surge arrester shall be _____ the maximum continuous phase-to-ground power frequency voltage available at the point of application. A. Equal to B. Equal to or greater than C. Equal to or less than D. Less than |
B. Equal to or greater than Article: 280.4(A) |
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The branch-circuit Overcurrent devices in emergency circuits shall be ______. A. Fuses only B. A slow-blow type C. Of the reset type only D. Accessible to the authorized personnel only |
D. Accessible to the authorized personnel only. Article: 700.25 |
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Because aluminum is not a magnetic metal, there will be _____. A. No heating due to hysteresis B. No heating due to voltage C. No induced currents D. None of these |
A. No heating due to hysteresis Article: 300.20(B) FPN 1 |
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Derating factors shall not apply to conductors in nipples having a length not exceeding _____. A. 24" B. 30" C. 36" D. 48" |
A. 24" Article: Table 9 Note 4 |
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What is the minimum headroom of working space above service equipment. A. 56" B. 66" C. 78" D. 96" |
C. 78" Article: 110.26(A)(3) |
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What is the maximum number of 18-AWG TFFN conductors that are allowed in 1/2" electrical nonmetallic tubing. A. 18 B. 20 C. 22 D. 23 |
A. 18 Annex C Table 2 |
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The grounded circuit conductor shall not be used to ground the equipment on the supply side of the AC service disconnecting means. A. True B. False |
B. False Article: 215.6 |
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The secondary circuits of wound-rotor AC motors, including ______, shall be permitted to be protected against overload by the motor-overload device. A. Conductors D. conductors, controllers and resisters. |
D. conductors, controllers and resisters. Article: 430.32(E) |
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A building or other structure served shall be supplied by _____. A. One service B. Two services C. Six services D. None of the above |
A. One service Article: 230.2 |
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The maximum length of an equipment bonding jumper on the outside of a raceway is _______. A. 25' B. 6' C. 3' D. 1.8' |
B. 6' Article: 250.102(E)(2) |
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Which of the following wiring methods shall not be permitted in ducts or plenums used for environmental air? A. MI cable B. MC cable C. NM cable D. EMT |
C. NM cable Article: 300.22(B) |
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Cable tray systems shall not be used in _____ or where subject to damage. A. Hazardous locations B. Hoistways C. 600-volt systems D. Tunnels |
B. Hoistways Article: 370.3 |
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A 300W, 130V incandescent lamp draws ____A. A. 3 B. 2.6 C. 2.1 D. 2.3 |
D. 2.3
I=P/E I=300/130 I=2.3A |
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A circuit has 1.5A of current through a 40ohm resister. The current is ____A if the resistance is increased to 50 ohms. A. 1.5 B. 2 C. 1.2 D. 2.6 |
C. 1.2
E= I x R E= 1.5 x 40 E= 60V I=E/R I= 60/50 I= 1.2A |
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Three 8 ohm resisters are connected in series. The total resistance is ____ohms. A. 24 B. 2.66 C. 8 D. None of the above |
A. 24 ohms
Rt= R1+R2+R3 Rt= 8+8+8 Rt= 24 ohms |
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Three 8 ohm resisters are connected in parallel. The total resistance is ____ ohms. A. 2.66 B. 24 C. 8 D. None of the above |
A. 2.66 ohms
Rt=R1/N Rt= 8/3 Rt= 2.66 ohms |
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A 5 ohm and a 10 ohm resister are connected in parallel. The total resistance is ____ ohms. A. 15 B. 3.33 C. 50 D. None of the above |
B. 3.33 ohms Rt=(R1xR2)/(R1+R2) Rt= (5x10)/(5+10) Rt= 50/15 Rt= 3.33 ohms |
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For a cord-and-plug connected motor not to have a HP-rated attachment plug, the motor must be rated ____ or less. A. 1/4 HP B. 1/3 HP C. 1/2 HP D. 1 HP |
B. 1/3 HP Article: 430.109(F) |
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Which of the following conductors is moisture and heat resistant? A. TBS B. TFE C. TW D. RHH |
D. RHH Trade knowledge |
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Knife switches rated at over 1200A at 250V or less ___. A. May be opened under load B. Should be connected in parallel. C. Shall be used only as isolating switch. D. Should be placed so the gravity tends to close them. |
C. Shall be used only as isolating switch. Article: 404.13(A) |
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Emergency power for hospitals shall have a transition time, from instant of failure to normal service to the emergency generator source, not to exceed ____. A. 30sec B. 10sec C. 5sec D. 1sec |
B.10sec Article: 700.12 |
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An insert installed in a cellular concrete floor raceway shall be grounded to the raceway by ____. A. A connection on the header. B. A grounding device. C. The insert D. A grounding fitting |
A. A connection on the header Article: 372.9 |
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Which of the following is not required on a motor nameplate. A. Watts B. Voltage C. HP D. Manufactures identification |
A. Watts Article: 430.7 |
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A 10 ohm heater draws 4A from a power supply. The power supply is ____V. A. 120 B. 0.4 C. 40 D. None of the above |
C. 40 E= IxR E= 4x10 E= 40V |
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The unit for the measurement of work is the ___. A. Coulomb B. Farad C. Foot-pound D. Watt-Hour |
C. Foot-pound
Electrical theory |
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A conducting material has a certain resistance at 30*C(__*F) A. 30 B. 68 C. 86 D. 72 |
C. 86*F
*F=(1.8x*C)+32 *F= 1.8x30+32 *F= 54+32 *F= 86 |
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The operating temperature of an insulation should not exceed 104*F(__*C) A. 40 B. 60 C. 72 D. None of the above |
A. 40*C
*C= (*F-32)/1.8 *C= (104-32)/1.8 *C= 72/1.8 *C= 40 |
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Current is defined as the flow of ___. A. protons B. Neutrons C. Ohms D. Electrons |
D. Electrons Electrical Theory |
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Factory-installed internal wiring need not be inspected at the time of installation of the equipment if the equipment has been listed by ____. A. A qualified electrical testing laboratory having the facilities required to test wiring equipment and materials. B. Government organizations C. National Fire underwriters D. A qualified electrical testing laboratory that is recognized as having the facilities required to test wiring equipment and materials. |
D. A qualified electrical testing laboratory that is recognized as having the facilities required to test wiring equipment and materials. Article: 90.7 |
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Places of assembly are designed or intended for the assembly of ____ or more persons. A. 50 B. 100 C. 200 D. 400 |
B. 100 Article: 518.1 |
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A solidly grounded service disconnect (277/480 volt, 3-phase) rated 1000 amps containing 800-amp fuses is required to have ground fault protection. A. True B. False |
A. True Article: 230.95 |
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Conductors ____ and larger shall be stranded when installed in raceways. A. 10 AWG B. 12 AWG C. 8 AWG D. None of these |
B. 8 AWG Article: 310.106(C) |
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Cord-and-plug connected appliances connected to branch circuits with other lighting loads shall not exceed ____ of the branch circuit rating. A. 50% B. 80% C. 100% D. 125% |
A. 50% Article 210.23 |
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At what angle does a header attach to a floor duct? A. Right angle B. parallel C. Straight D. None of these |
A. Right angle Trade knowledge |
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The maximum recommended line loss for a 40A, 240V, 1 phase branch circuit is _____V. A. 12 B. 7.2 C. 3.6 D. None of the above |
B. 7.2 210.19(A):FPN4: 240V x 0.03= 7.2 |
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A 115V, 1 phase circuit has an 8V line loss the voltage drop is __% A. 14.38 B. 6.96 C. 2.64 D. None of the above |
B. 6.96
VD= line loss/ supply V x 100 VD= 8/115 x 100 VD= 6.96% |
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A transformer has a 300W, 120V primary and a 295W, 12V Secondary. The transformer is ___% efficient. A. 95 B. 98 C. 100 D. 80 |
B. 98%
Eff= output/input Eff= 295/300 Eff= 98% |
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With a source voltage of 120V and a load of 6500W, the voltage across the load reads 115V. The power consumed by the by the conductors is ___W A. 283 B. 300 C. 150 D. 75 |
A. 283
I= P/E I= 6500/115 I= 56.62 P= E x I P= 120 x 56.62= 6782.4 P= 115 x 56.62= 6499.8 P= 6782.4 - 6499.8 P= 283W |
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The Joule is the measurement of ____. A. Voltage C. Electrons D. Resistance |
B. Energy
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Electromotive force is ____. A. Potential difference B. Energy C. Work D. Resistance |
A. Potential difference
Electrical theory |
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A length of wire 60m long equals ____'ft A. 152.4 B. 145.4 C. 197 D. 210 |
C. 197 60m x 3.28084'= 196' |
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A length of conduit 24" long equals ___ cm. A. 61 B. 7.31 C. 78 D. 55.4 |
A. 61 24" x 2.54= 69.96 |
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The total resistance of a circuit that has a 12ohm connected in series with six, 12 ohm resisters connected in parallel is ___ ohm. A. 18 B. 8.9 C. 14 D. 12.4 |
C. 14
R2= R/N R2= 12/6 R2= 2 Rt= R1+R2 Rt= 12+2 Rt= 14 |
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The total resistance of a circuit that has an 8 ohm resister connected in series with a 5, 7, and 9 ohm resister connected in parallel is ___ ohms. A. 10.2 B. 7.1 C. 29 D. 12 |
A. 10.2 Rp= 1/((1/R1)+(1/R2)+(1/R3)) Rp= 1/((1/5)+(1/7)+(1/9)) Rp= 1/(0.2+0.142+0.111) Rp= 1/0.453 Rp= 2.2 Rt= 2.2+8 Rt= 10.2 |
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