Tennessee Electrical (CE) Contractor Examination

A balanced 480-volt, three-phase load draws 65 amperes at a lagging power factor of 0.88. What is the real power of this load?

• A27.5 kW
• B47.6 kW
• C54.1 kW
• D62.4 kW

A 120-volt, single-phase, 2-wire branch circuit supplies an 18-ampere load. The one-way conductor length is 90 feet of 12 AWG copper (K = 12.9, area = 6,530 CM). What is the calculated voltage drop?

• A3.20 volts
• B5.55 volts
• C6.40 volts
• D10.51 volts

A series 60 Hz circuit has 8 ohms of resistance, 15 ohms of inductive reactance, and 9 ohms of capacitive reactance. What is the impedance of the circuit?

• A6.0 ohms
• B10.0 ohms
• C16.6 ohms
• D32.0 ohms

A resistive heater rated 240 volts has a hot resistance of 16 ohms. What current does it draw at rated voltage?

• A0.067 ampere
• B15 amperes
• C256 amperes
• D3,840 amperes

A 60 Hz sine-wave voltage has a peak value of 170 volts. What is the approximate RMS value?

• A85 volts
• B108 volts
• C120 volts
• D240 volts

Under the 2017 NEC, a grounded circuit conductor 6 AWG or smaller shall generally be identified by which means?

• AGreen insulation or green with yellow stripes only
• BA continuous white or gray outer finish, or three continuous white or gray stripes
• COrange insulation on all voltages above 150 volts to ground
• DBare copper only, with no insulated option

One mechanical horsepower is equal to which electrical power value?

• A746 watts
• B1,000 watts
• C550 watts
• D1,200 watts

Two 20-ohm resistors are connected in parallel. That combination is connected in series with a 10-ohm resistor. What is the total resistance?

• A10 ohms
• B15 ohms
• C20 ohms
• D50 ohms

What is the full-load line current of a 75 kVA, 480-volt, three-phase transformer?

• A90 amperes
• B156 amperes
• C52 amperes
• D78 amperes

A three-phase motor delivers 36 kW of real power while drawing 48 kVA. What is the power factor?

• A0.67
• B0.75
• C0.80
• D1.33

A 12 kW electric heater operates 8 hours. Energy costs USD 0.14 per kWh. What is the energy cost for that period?

• AUSD 1.68
• BUSD 13.44
• CUSD 10.75
• DUSD 16.80

A 10-horsepower, 240-volt, single-phase motor draws 40 amperes at a power factor of 0.90. What is the motor efficiency?

• A77.7 percent
• B86.3 percent
• C90.0 percent
• D100 percent

A 45 kVA, 480–208Y/120-volt, three-phase transformer is fully loaded. What is the secondary line current?

• A54 amperes
• B125 amperes
• C216 amperes
• D94 amperes

What is the inductive reactance of a 0.08-henry inductor at 60 Hz? Use 2π = 6.28.

• A7.5 ohms
• B30.1 ohms
• C4.8 ohms
• D377 ohms

An electrical floor plan is drawn at a scale of 1/4 inch = 1 foot-0 inches. A homerun measures 3-1/2 inches on the drawing. What is the actual plan length of that run?

• A7 feet
• B10 feet 6 inches
• C14 feet
• D28 feet

A commercial electrical plan is drawn at 1/8 inch = 1 foot-0 inches. A feeder measures 6 inches on the drawing. What field length does that represent?

• A24 feet
• B36 feet
• C48 feet
• D72 feet

In the 2017 NEC, Informational Notes are which of the following?

• AMandatory Code rules enforceable as written
• BExplanatory material that is not enforceable as a Code requirement
• CExceptions that replace the parent rule in all cases
• DThe only permitted text inside Chapter 9 tables

The 2017 NEC definition of in sight from (within sight from, within sight) requires the specified equipment to be visible and not more than how far from the other equipment?

• A25 feet
• B50 feet
• C75 feet
• D100 feet

A continuous load is a load where the maximum current is expected to continue for how long?

• A1 hour or more
• B2 hours or more
• C3 hours or more
• D8 hours or more

Which statement correctly describes how the 2017 NEC chapters apply?

• AChapters 1 through 4 apply generally; Chapters 5, 6, and 7 supplement or modify them; Cha…
• BEvery chapter applies equally to every occupancy with no modifications
• CChapter 8 always overrides Chapters 1 through 4 even when Chapter 8 is silent
• DAnnexes A through J are mandatory installation rules

Which part of the 2017 NEC contains the tables used for conductor properties, raceway fill percentages, and dimensions?

• AChapter 1
• BChapter 3 only
• CChapter 9
• DArticle 100

Using the 2017 NEC optional dwelling method (220.82), calculate the service load for a 2,000 ft² one-family dwelling with two small-appliance circuits, one laundry circuit, a 12 kW range, a 4.5 kW water heater, a 5 kW dryer, 8 kW of electric heat, and a 240-volt air conditioner rated 28 amperes. What is the calculated service current at 240 volts?

• A81 amperes
• B106 amperes
• C140 amperes
• D168 amperes

A one-family dwelling has 2,800 ft² of floor area, two 20-ampere small-appliance circuits, and one laundry circuit. Using the 2017 NEC standard calculation, what is the general lighting, small-appliance, and laundry demand after Table 220.42?

• A12,900 VA
• B6,465 VA
• C7,515 VA
• D4,515 VA

What is the 2017 NEC Table 220.55 demand for one 14 kW, 240-volt household electric range?

• A8.0 kW
• B8.8 kW
• C14.0 kW
• D11.2 kW

Unless specifically permitted in 240.4(E) or (G), what is the maximum overcurrent protection for a 12 AWG copper conductor under 2017 NEC 240.4(D)?

• A15 amperes
• B20 amperes
• C25 amperes
• D30 amperes

Under the 2017 NEC, which dwelling-unit receptacles require GFCI protection in a laundry area?

• AOnly the receptacle within 6 feet of a laundry sink
• BAll 125-volt, single-phase, 15- and 20-ampere receptacles installed in the laundry area
• COnly the clothes-washer receptacle
• DNone, if the circuit already has AFCI protection

Under the 2017 NEC, which 120-volt, 15-ampere dwelling branch circuit requires AFCI protection?

• ABathroom receptacle circuit
• BKitchen lighting circuit
• CGarage door-opener circuit
• DOutdoor luminaire circuit

A 4-inch × 1-1/2-inch square metal box contains two 12/2 NM cables with grounds, one internal cable clamp, and one duplex receptacle. No conductors pass through unused. What box-fill volume is required by 2017 NEC 314.16?

• A13.50 in³
• B15.75 in³
• C18.00 in³
• D20.25 in³

Four current-carrying 8 AWG THHN/THWN-2 copper conductors are installed in a raceway in a 30°C ambient. Terminations are rated 75°C. What adjusted ampacity is used to select overcurrent protection for a non-motor load?

• A40 amperes
• B44 amperes
• C50 amperes
• D55 amperes

What is the minimum rating of the ungrounded service conductors and service disconnecting means for a one-family dwelling under 2017 NEC 230.79(C)?

• A60 amperes
• B100 amperes
• C150 amperes
• D200 amperes

Under the 2017 NEC, the service disconnecting means for each service is permitted to consist of not more than how many switches or circuit breakers in a single enclosure, group of separate enclosures, or switchboard?

• AOne
• BTwo
• CSix
• DEight

What is the minimum working-space depth in front of a 208Y/120-volt panelboard under Condition 1 of 2017 NEC Table 110.26(A)(1)?

• A3 feet
• B3 feet 6 inches
• C4 feet
• D6 feet

A 480Y/277-volt switchboard has exposed live parts on one side of the working space and a grounded concrete wall on the opposite side. What is the minimum working-space depth?

• A3 feet
• B3 feet 6 inches
• C4 feet
• D5 feet

Under 2017 NEC 110.26(C)(2), large equipment requires a second entrance to the working space when the equipment is rated 1200 amperes or more and is over which width?

• A4 feet
• B5 feet
• C6 feet
• D8 feet

A 400-ampere feeder is protected at 400 amperes. What is the minimum conductor ampacity for a 10-foot tap installed under 2017 NEC 240.21(B)(1), assuming the tap supplies a single OCPD and meets the other 10-foot tap conditions?

• A30 amperes
• B40 amperes
• C100 amperes
• D133 amperes

A 300-ampere feeder is protected at 300 amperes. What is the minimum conductor ampacity for a 25-foot tap installed under 2017 NEC 240.21(B)(2)?

• A30 amperes
• B75 amperes
• C100 amperes
• D150 amperes

A 200-ampere, 120/240-volt service uses 2/0 AWG copper ungrounded conductors. The only grounding electrodes are two ground rods. What is the largest copper grounding electrode conductor the 2017 NEC requires to those rods?

• A8 AWG
• B6 AWG
• C4 AWG
• D2 AWG

The largest ungrounded service-entrance conductors are 3/0 AWG copper. The grounding electrode is an underground metal water pipe bonded to a concrete-encased electrode. What is the minimum copper grounding electrode conductor required by 2017 NEC Table 250.66?

• A8 AWG
• B6 AWG
• C4 AWG
• D2 AWG

What is the minimum copper equipment grounding conductor for a 200-ampere feeder under 2017 NEC Table 250.122?

• A8 AWG
• B6 AWG
• C4 AWG
• D2 AWG

How many 20-ampere small-appliance branch circuits does 2017 NEC 210.11(C)(1) require for the receptacle outlets specified in 210.52(B) of a one-family dwelling?

• AOne 15-ampere circuit
• BTwo or more 20-ampere circuits
• COne 20-ampere circuit
• DThree 15-ampere circuits

A dwelling kitchen island countertop measures 4 feet by 3 feet. Under the 2017 NEC, how many receptacle outlets are required for that island?

• ANone
• BAt least one
• CTwo
• DThree

Under 2017 NEC 210.52(G)(1), a dwelling attached garage with two vehicle bays requires which receptacle arrangement?

• AOne receptacle anywhere in the garage
• BAt least one receptacle outlet in each vehicle bay, not more than 5-1/2 feet above the fl…
• COne 20-ampere receptacle only on the front exterior wall
• DNo receptacle if an electric-vehicle charger is installed

What is the minimum vertical clearance above a residential driveway for 120/240-volt overhead service-drop conductors under 2017 NEC 230.24(B)?

• A8 feet
• B10 feet
• C12 feet
• D18 feet

Ground-fault protection of equipment is required by 2017 NEC 230.95 for a solidly grounded wye service of more than 150 volts to ground when the service disconnect is rated how many amperes or more?

• A400 amperes
• B800 amperes
• C1,000 amperes
• D2,000 amperes

Cables and raceways through bored holes in wood framing members shall be at least how far from the nearest edge of the wood member, unless a steel plate is installed?

• A3/4 inch
• B1 inch
• C1-1/4 inches
• D2 inches