C-11 (CR-11) Electrical (Commercial) Learning Mode

Question ID: 54700 What is the MINIMUM size grounded conductor for service equipment where service entrance phase conductors are installed in parallel? A - 1/0 B - 2/0 C - 1 D - 2

A - 1/0

Question ID: 53228 Where type UF cable is terminated in a plastic single gang box, the cable sheath must not extend less than _________ inside the box and beyond the cable clamp. A - 1/4 inch B - 1 inch C - 1/2 inch D - 1/8 inch

A - 1/4 inch

Question ID: 54337 What is the furthest set back a flush mounted box can be from a noncombustible finished surface? A - 1/4 inch B - Flush C - 1/8 inch D - 3/8 inch

A - 1/4 inch

Question ID: 55252 Conduit used for above ground use shall have permanent markings at least every ___________ feet. A - 10 B - 3 C - 8 D - 5

A - 10

Question ID: 52300 What is the maximum amperage for a cord and plug connected load to a receptacle of a 15 amp circuit? A - 12 B - 30 C - 20 D - 26

A - 12

Question ID: 54336 What is the minimum junction or pull box size for a straight pull with 2 inch conduit? A - 16 inch B - 24 inch C - 8 inch D - 12 inch

A - 16 inch

Question ID: 12531 According to the NEC, a commercial occupancy available to pedestrians shall be provided an outside sign outlet rated at least _________ amps that supplies no other load. A - 20 B - 30 C - 5 D - 40

A - 20

Question ID: 51306 What is the highest branch circuit rating for fire alarms? A - 20 amp B - 40 amp C - 15 amp D - 30 amp

A - 20 amp

Question ID: 53698 What is the primary protection of a transformer that is 240 volts, 13 amps? A - 20 amps B - 25 amps C - 30 amps D - 35 amps

A - 20 amps

Question ID: 12476 The total resistance to ground, measured with an ohm meter, of a grounding rod shall not exceed _______ ohms. A - 25 B - 40 C - 10 D - 30

A - 25

Question ID: 54431 Service entrance cables shall be supported by straps or other approved means within 12 inches of every serice head, gooseneck, or connection to a raceway or enclosure and at intervals not exceeding: A - 30 inches B - 18 inches C - 12 inches D - 24 inches

A - 30 inches

Question ID: 52333 The width of the free working space in front of a 480v/120v transformer 48 inches wide must be a minimum of __________. A - 48 inches B - 18 inches C - 40 inches D - 30 inches

A - 48 inches

Question ID: 53436 Overcurrent circuit protection for NPLFA conductors 18 AWG shall not exceed: A - 7 amperes B - 14 amperes C - 12 amperes D - 10 amperes

A - 7 amperes

Question ID: 117028 What is the minimum wire gauge for a grounding electrode conductor on a DC photovoltaic circuit? A - 8 AWG B - 10 AWG C - 12 AWG D - 6 AWG

A - 8 AWG

Question ID: 51356 On a 480 volt, 3 phase, 4 wire, delta connected system, which phase has the higher voltage? A - B phase B - A phase C - D phase D - C phase

A - B phase

Question ID: 54365 What type of cable is allowed for vertical runs in a 3 story apartment building? A - CATVR B - CATVP C - CATVX D - CATV

A - CATVR

Question ID: 118320 What is the heart of a PV system? A - Charge controller B - inverter C - cells D - batteries

A - Charge controller

Question ID: 12784 A remote gasoline pump is located outdoors. electrical equipment is installed 12 inches above grade and 9 feet horizontally from the edge of the pump. This electrical equipment installation is classified as _________. A - Class I group D division 2 B - Class II group D division 1 C - Class II group D division 2 D - Class I group D division 1

A - Class I group D division 2

Question ID: 52064 What class and division would a grain elevator be considered? A - Class II Division I B - Class III Division I C - Class I Division II D - Class I Division I

A - Class II Division I

Question ID: 51514 In fire alarms, what type cable is used in ducts and plenums or other spaces for environmental air ? -or- A company wants to run fire alarm supply cable through an environmental air duct, what type of cable is required? A - NPLFP B - FPL C - NPLF D - NPLFR

A - NPLFP

Question ID: 53466 If a single phase 2 wire inverter output is connected to the neutral and one ungrounded conductor of a 3 phase 4 wire wye connected system, the maximum load connected between the neutral and any one ungrounded conductor plus the inverter rating shall not exceed: A - The ampacity of the neutral conductor B - The maximum output of the generator C - All of the above D - The output of the 3 Phase controller

A - The ampacity of the neutral conductor

Question ID: 52503 What is the maximum number of floors electriccal non-metallic tubing in allowed to span? A - Three B - Five C - one D - Two

A - Three

Question ID: 54605 What is missing from the 5 HP moter on circuit 9? A - disconnect B - GFCI C - ? D - receptical

A - disconnect

Question ID: 54571 A 480/120 Volt transformer secondary must not be grounded if it is: A - supplying crane contacts B - a 3 phase, 4 wire system C - when used only for residential service D - supplying a furnace

A - supplying crane contacts

Question ID: 55477 How is an equipment grounding conductor larger than 6 AWG, that is not being used in conduit, identified? A - use green at each termination B - use white conductor C - use grey conductor D - partial stripping of insulation

A - use green at each termination

Question ID: 54313 What is the minimum clearance for service drops above sidewalks? A - 8feet B - 10 feet C - 15 feet D - 6 feet

B - 10 feet

Question ID: 54335 Underground conduits serving a feeder should be marked how often? A - 25 feet B - 10 feet C - 100 feet D - 50 feet

B - 10 feet

Question ID: 96300 A complex has ten - 930 sq. ft. units, each with a 6 kw. range. What is the net calculated load for one unit? A - 9,977 VA B - 11,977 VA C - 13,797 VA D - 8,777 VA

B - 11,977 VA

Question ID: 13603 A ground ring shall be in direct contact with the earth at a depth below the earth surface not less than: A - 2 feet B - 2 1/2 feet C - 1 1/2 feet D - 3 feet

B - 2 1/2 feet

Question ID: 14096 In a bedroom a receptacle must be installed in any unbroken wall space that is a minimum of what length? A - 30 inches B - 24 inches C - 18 inches D - 12 inches

B - 24 inches

Question ID: 54544 Conductors ma be installed in nipples with out derating when the nipples do not exxceed a maximum length of: A - 12 inches B - 24 inches C - 18 inches D - 30 inches

B - 24 inches

Question ID: 54925 When a PV system is not charging, how long should the barreries last? A - 1 - 2 days B - 3 - 5 days C - 5 -7 days D - 7 -8 days

B - 3 - 5 days

Question ID: 54601 What is the ampacity of each conductor in a conduit containing (9) #8 wires, consisting of (3) 2 wire circuits with grounds? A - 35 AMPS B - 40 AMPS C - 50 AMPS D - 60 AMPS

B - 40 AMPS

Question ID: 117786 What is the general lighting load of an industrial loft that is 300 feet by 100 feet? A - 30,000 B - 60,000 C - 15,000 D - 90,000

B - 60,000

Question ID: 54371 When type UF cable is used with a single gang non-metalic box mounted in walls or ceilings and the sheathing extends a minimum of 1/4 inch into the box the cable need not be secured to the box if the cable is fastened within what distance of the box? A - 12 inches B - 8 inches C - 6 inches D - 18 inches

B - 8 inches

Question ID: 54322 What is the system called when there is a PV Array, inverter, battery, DC disconnect and charge controller? A - ? B - AC Generation C - A charge system D - ?

B - AC Generation

Question ID: 13025 What low voltage classification is assigned to a remote controlled safety control equipment circuit if failure of the equipment to operate induces a direct fire or life hazard? A - Class II B - Class I C - Class III D - Class IV

B - Class I

Question ID 53234 The grounding electrode of a separately derived system shall be as near as practicable to and preferably in the same area as the grounding electrode conductor connection to the system. The grounding electrode shall be the nearest one of the folllowing; A - The ground ring of a lightning protection system B - Effectively grounding building steel structural beams. C - Poly pipe water system. D - The "XO" connection terminal at the transformer.

B - Effectively grounding building steel structural beams.

Question ID: 54366 A solar PV system that uses no active control system to protect the battery from overcharging or undercharging is called? A - charge-controlled B - Self-Regulating C - Stand Alone D - Direct Coupled

B - Self-Regulating

Question ID: 54321 Of the following, what is not allowed for the construction of a commercial lampholder that will be used in Class I hazardous location? A - Hook B - Switch C - handle D - Insulation

B - Switch

Question ID: 120161 What type if recessed luminaire is permitted to be in contact with combustible materials? A - Type CM B - Type IC C - Type FR D - non-type IC

B - Type IC

Question ID: 12480 What color identifies the "B" Phase of a 240 volt, delta, three phase, 4 wire with a high leg? A - white B - orange C - red D - blue

B - orange

Question ID: 53753 Buildings that contain branch circuits supplied from more than one nominal vltage system, each ungrounded conductor of a branch circuit shall be identified by ____________. A - ampacity B - phase or line C - system voltage D - polarity

B - phase or line

Question ID: 50884 What type of power tool requires specific training of operators before they are allowed to operate it? A - hydraulic powered B - powder actuated C - fuel powered D - Pneumatic powered

B - powder actuated

Question ID: 116900 A PV system that uses only careful design and component sizing to protect the battery is called _________. A - an array B - self-regulated C - a stand-alone system D - direct-coupled

B - self-regulated

Question ID: 12116 What is the minimum allowable numbber of overload relays for single phase motor? A - 3 B - none C - 1 D - 2

C - 1

Question ID: 51424 In a hermetic refrigerant motor compressor, the ampere rating shall be ___________ percent of the nameplate rated load current. A - 120 B - 100 C - 115 D - 110

C - 115

Question ID: 11940 Disregarding all exceptions, the ampacity of the conductors from the generator terminals to the first overcurrent device shall be a minimum of _________ of a nameplate current rating of & the generator. A - 130% B - 100% C - 115% D - 125%

C - 115%

Question ID: 54348 The maximum single phase over current protection rating shall be set at not more than _______ of the phase converter nameplate single phase input full-load amperes? A - 115 B - 100 C - 125 D - 250

C - 125

Question ID: 12763 Given: A 240/480 volt 3 phase power panel board supplies only the following load: 1 - 15,000 VA, 480 volt, 3 phase balanced resetive load. Each ungrounded conductor in the sub-feeder to this power panel has a total net computed load of how many amps? A - 10 amps B - 42 amps C - 18 amps D - 31 amps

C - 18 amps

Question ID: 54428 The input leads for a transformer in a fire alarm system shall be no smaller than. A - 14 awg B - 20 awg C - 18 awg D - 16 awg

C - 18 awg

Question ID: 12963 Given: The coaxial cable on a cable TV system is inside a building where electrical power conductors are Not in the same raceways or cable trays. What minimum separation must this coaxial cable have from the electric power lines? A - 4 inches B - 8 inches C - 2 inches D - 6 inches

C - 2 inches

Question ID: 13046 An electrical junction box contains only the following: 3, #12 insulated conductors entering the box. One device on a mounting strap. Two cable clamps. Two bare # 12 grounding conductors. What is the minimum cubic inch capacity for this junction box? A - 24.75 cubic inches B - 20.25 cubic inches C - 22.50 cubic inches D - 18.00 cubic inches

C - 22.50 cubic inches

Question ID: 51417 If a grounding rod does not have a resistance of _______ ohms or less, it must be augmented by one additional electrode. A - 20 B - 30 C - 25 D - 35

C - 25

Question ID: 54354 A 10 unit apartment building, each unit has one 20.8 KW electric range. What is the total demand for all ranges? A - 49 KW B - 200 KW C - 36 KW D - 55 KW

C - 36 KW

Question ID: 54607 Refer to the illustration, what size disconnect is required for the 10HP fan? A - 30 AMP B - 15 AMP C - 40 AMP D - 50 AMP

C - 40 AMP

Question ID: 54551 What is the maximum fill percentage for a conduit with 2 ungrounded conductors and 1 grounded conductor in it? A - 31 percent B - 100 percent C - 40 percent D - 53 percent

C - 40 percent

Question ID: 12214 A main lug only (MLO) panel is limited to how many overcurrent protection devices? A - 24 B - 40 C - 42 D - 30

C - 42

Question ID: 54312 How many waterflow actuators are allowed on one fire alarm power circuit? A - 3 B - 1 C - 5 D - 7

C - 5

Question ID: 12255 The minimum thickness of the sealing compound in class 1, Division 1 and 2 shall not be less than the trade size of the conduit and in no case less than: A - 3/16 inch B - 1/2 inch C - 5/8 inch D - 3/4 inch

C - 5/8 inch

Question ID: 4292 A park has 35 mobile home sites. The ungrounded wires in the service to supply this park must be a calculated size of at least: A - 584 amps B - 540 amps C - 560 amps D - 608 amps

C - 560 amps

Question ID: 12897 A park has 45 mobile home sites, the largest typical moble home will have a load of 15,000 VA. The park is supplied by 120/240 volt single phase service. The ungrounded conductors in the service to supply this park must be sized to carry a minimum net computed load of: A - 720 amps B - 166 amps C - 690 amps D - 3000 amps

C - 690 amps

Question ID: 54341 what is the line voltage drop of a 480V, single phase, 400 amp feed approximately 543 ft away? A - 8 Volts B - 10 Volts C - 9 Volts D - 3 Volts

C - 9 Volts

Question ID: 54310 In a fire rated assembly with a junction box and fixture, which is true? A - The junction box can be supported by the fire rated ceiling B - The junction box can be mounted directly to the fire rated ceiling. C - A separate and independent structure must be provided to support the junction box. D - The juction box can be supported by wire which passes through the fire rated ceiling.

C - A separate and independent structure must be provided to support the junction box.

Question ID: 53394 An insulated grounded conductor 6 AWG or smaller shall be identified by which of the following measns? A - Continuous outer finish of white along its entire length B - Three continouous white stripes on other than green insulation along its entire length. C - All of the other choices D - Continuous outer finish of gray along its entire length.

C - All of the other choices

Question ID: 52222 Grounded dc photovoltaic arrays located on dwellings shall be provided with _______ to reduce fire hazards. A - ARC fault B - Fire alarm C - DC GFCI D - Fire Suppression System

C - DC GFCI

Question ID: 54199 In a residence, besides smoke detectors, where may a heat detector be installed? A - Bedroom B - Hallway C - Dining room D - Bathroom

C - Dining room

Question ID: 51334 A ground rod is measured and has a resistance of more than 25 ohms, what should be done? A - leave it alone B - shorten the rod length C - Drive additional rods D - Move the rod

C - Drive additional rods

Question ID: 54372 Intrinsically safe conductors shall be permitted to be identified with what color when no other conductors are of the same color? A - yellow B - red C - Light Blue D - Green with Yellow stripe

C - Light Blue

Question ID: 54357 What is required of a flush deck junction box serving a light for a pool? A - A cover B - allowed only if over 15 volts C - Potting Compound D - A gasket seal

C - Potting Compound

Question ID: 116898 A stand-alone PV system _________. A - uses a PV array as the only power source B - the simplest type of PV system C - Supplies power independently of the electric utility D - is detached from the house

C - Supplies power independently of the electric utility

Question ID: 52120 Single conductor cable type ______ listed and labled as photovoltaic wire shall be permitted in exposed outdoor locations in photovoltaic source circuits for photovoltaic module interconnections within the photovltaic array. A - AC stranded THHN B - DC welder type cable C - Use-2 D - THHW-2

C - Use-2

Question ID: 116901 PV systems are required to be __________ if loads are variable or uncontrolled. A - utility-interactive B - self-regulated C - charge-controlled D - stand-alone

C - charge-controlled

Question ID: 54477 The primary interface unit in photovoltaic solar system with the utility company is the: A - PV array B - panelboard C - interactive inverter D - meter

C - interactive inverter

Question ID: 14099 Where are splices allowed in conductors in surface metal raceways if they do not have removable covers? A - at any location B - any where in the supply just not in the raceway C - only in junction boxes D - only in light boxes

C - only in junction boxes

Question ID: 54473 In Class I, Division 1 locations, rotating electrical machinery shall be: A - type designed to be submerged in a liquid that is non-flammable only when vaporized and mixed with air. B - totally open inert gas-filled type. C - totally enclosed type supplied with positive-pressure ventilation. D - identified for class 1 division 2 locations.

C - totally enclosed type supplied with positive-pressure ventilation.

Question ID 11975 Enclosures for overcurrent devices or panel boxes in damp or wet locations shall be mounted so that there is at least _______ inch air space between the wall or other supporting surface. A - 1/2 B - 3/8 C - 1/8 D - 1/4

D - 1/4

Question ID: 12157 The disconnecting means for motor circuits rated 1000 volts, nominal, or less, shall have an ampere rating of what percent of the full-load current rating of the motor? A - 123 % B - 150 % C - 100 % D - 115 %

D - 115 %

Question ID: 52113 A substation of 1000 volts or more has a six foot fence with three strands of barbed wire along the top, how high above the fence must the top strand of barbed wire be? A - 24 inches B - 30 inches C - 18 inches D - 12 inches

D - 12 inches

Question ID: 53425 Pendent luminaire in a Class 1, Division 1 location shall be effectively braced against lateral displacement at a level not more than _______ above the lower end of the stem. A - 36 inches B - 24 inches C - 18 inches D - 12 inches

D - 12 inches

Question ID: 54805 Incircuits containing a dc diversion charg controller and a dc diversion load, the opower rating of the diversion load shall be at least _______ of the power rating of the photovoltaic array. A - 115 percent B - 125 percent C - 200 percent D - 150 percent

D - 150 percent

Question ID: 118360 What is the maximum connected load to a 20 amp GFCI supplying 2 or more receptacles? A - 12 Amp B - 25 Amps C - 20 Amps D - 16 Amps

D - 16 Amps

Question ID: 12902 A metal electrical box contains the following; 3 size 12 AWG conductors, 3 size 10 AWG conductors, 1 flush switch, The switch is connected to two (2) of the size 12 AWG conductors. There ar no other devices or fittigs. The cover plate does not have its capacity marked on it. There are no grounding conductors. All conductors originate outside the box. What minimum capacity is required for the metal electrical box containing these conductors and this switch? A - 16.75 cubic inches B - 16.50 Cubic inches C - 19.25 Cubic inches D - 18.75 cubic inches

D - 18.75 cubic inches

Question ID: 54696 What is the total demand for 12, 5kw dryers? A - 60kw B - 12kw C - 35kw D - 27.6kw

D - 27.6kw

Question ID: 54339 What is the distance from a junction box that rigid metal conduit must be supported? A - 10 feet B - 5 feet C - 1 foot D - 3 feet

D - 3 feet

Question ID: 54338 What is the maximum distance a rigid conduit can support a light fixture? A - 18 Inches B - 24 Inches C - 12 Inches D - 36 Inches

D - 36 Inches

Question ID: 51810 Grounding electrodes which are not listed and made of steel rods shall have a minimum diameter of at least ___________ inch. A - 1 B - 3/4 C - 1/2 D - 5/8

D - 5/8

Question ID: 12561 The phrase 'in sight from' specifies that one piece of equipment must be visible in not more than ______ feet in distance from the other. A - 75 B - 25 C - 100 D - 50

D - 50

Question ID: 1852 According to OSHA, what minimum height above grade that requires fail protection? A - 12 feet B - 16 feet C - 8 feet D - 6 feet

D - 6 feet

Question ID: 54907 The grounding electrode conductor for a DC system shall not be smaller than __________ copper or 6 AWG aluminum. A - 6 AWG B - 10 AWG C - 12 AWG D - 8 AWG

D - 8 AWG

Question ID: 51293 All of the following are true regarding scaffold planking except? A - overlap the supports a maximum of 12 inches B - extend over supports no less than 6 inches, no more than 12 inches C - cleated at both ends D - Be of certified grade

D - Be of certified grade

Question ID: 54328 A fuel dispensing station is considered what type of location? A - Class 2, Division 1 B - Class 1, Division 1 C - Class 2, Division 2 D - Class 1, Division 2

D - Class 1, Division 2

Question ID: 52540 According to the NEC, receptacles located in patient bed locations in a hospital are required to be ____________. A - Explosion proof B - Commercial Grade C - Isolated Ground D - Hospital Grade

D - Hospital Grade

Question ID: 51505 Conductors should be ________ to provide ready and safe and safe access in subsurface enclosures. A - Stacked B - by color code C - 4 inches of separation D - Racked

D - Racked

Question ID: 53435 The ampacity of a grounded neutral conductor of a 3 phase, 4 wire wye connected system used on a photovoltaic system shall not exceed: A - The maximum load between all ungrounded conductors and the unbalanced load on the neutral B - The ampere rating for the conductor listed on table 310.16 C - The name plate rating listed on the equipment D - The maximum load between the neutral and any ungrounded conductor and plus the inverter output rating

D - The maximum load between the neutral and any ungrounded conductor and plus the inverter output rating

Question ID: 12098 Thermostatically conttrolled switching devices are allowed to serve as a disconnect, provided all but one of the following conditions are met: A - provided with a marked 'off' position B - located within sight C - open all ungrounded conductors when place in 'off' position D - designed so that the circuit cannot be turned on automatically after the device is placed within sight

D - designed so that the circuit cannot be turned on automatically after the device is placed within sight

Question ID: 51122 Bonding jumpers in hazardous locations when lock nuts are not allowed to be depended on as a bonded connections can be connected by: A - unlisted clamp B - solder C - sheet metal screws D - exothermic welding

D - exothermic welding

Question ID: 54576 Transformers containing flammable liquids must be: A - enclosed in an open air caged off area B - 10 feet from any object C - 10 feet off the ground D - located in a vault

D - located in a vault

Question ID: 54563 Fire alarm wiring not in a raceway installed under a concrete slab and terminating at a flow switch must be: A - ? B - # 14 awg C - # 18 awg D - rated for wet locations

D - rated for wet locations

Question ID: 54479 Cables in conduit with a gas/vaportight continuous sheath capable of transmitting gasses or vapors through the cable core located in a class 1 division 1 location shall be sealed after: A - terminated corectly B - unwraping the sheath C - stripping the wires D - removing the jacket and any other coverings

D - removing the jacket and any other coverings