Journeyman Electrician Practice Test 31

Question 1: What is the calculated load on a branch circuit for 10, 15-ampere receptacles in a retail store?

• 1800 volt-ampere
• 1600 volt-ampere
• 2400 volt-ampere
• 1400 volt-ampere

NEC Reference: NEC 220.14(I)

Question 2: A 2,500 sq ft dwelling has a general lighting load of 3 VA per sq ft. At 120 V, how many 20-ampere general lighting circuits are needed for that load?

• 2
• 3
• 4
• 5

NEC Reference: NEC 220.41

Question 3: Why must an aluminum conductor be larger than a copper conductor to carry the same current?

• It has higher resistivity
• Aluminum weighs more per foot
• Its insulation is thicker
• Its melting point is lower

Question 4: Control circuit devices with screw-type pressure terminals are used with 14 AWG copper conductors. What minimum tightening torque applies, unless the device is marked otherwise?

• 12 in.-lb
• 7 in.-lb
• 5 in.-lb
• 3 in.-lb

NEC Reference: NEC 430.9(C)

Question 5: In a parallel circuit, which quantity is the same across every branch?

• Current
• Power
• Resistance
• Voltage

Question 6: What is the maximum power a 240-volt, 20-ampere circuit can deliver to a resistive load?

• 2,400 W
• 4,800 W
• 5,760 W
• 9,600 W

Question 7: A single receptacle is installed on an individual 30-ampere branch circuit. What is its minimum rating?

• 30 A
• 24 A
• 20 A
• 15 A

NEC Reference: NEC 210.21(B)(1)

Question 8: Plug fuses may be used in circuits of not more than what voltage between conductors (unless the system has a grounded neutral with not over 150 V to ground)?

• 300 V
• 240 V
• 125 V
• 120 V

NEC Reference: NEC 240.50(A)

Question 9: What is the allowable ampacity of a 4/0 AWG THWN copper conductor in the 75 °C column?

• 195 A
• 205 A
• 230 A
• 260 A

NEC Reference: NEC Table 310.16

Question 10: How many single-phase transformers are needed for an open-delta 3-phase connection?

• 1
• 2
• 3
• 4

Question 11: In a dwelling, GFCI protection is required for 125-volt through 250-volt receptacles in crawl spaces located:

• Above grade only
• Never; crawl spaces are exempt
• Only if the crawl space has a sump pump
• At or below grade level

NEC Reference: NEC 210.8(A)(4)

Question 12: A dwelling has two kitchens. May one 20-ampere small-appliance branch circuit serve receptacles in both kitchens?

• No; one kitchen per circuit
• Only if it is GFCI protected
• Yes, if both are on the same floor
• Yes, if it has no other loads

NEC Reference: NEC 210.52(B)

Question 13: Two resistors, each rated at 10 ohms, are connected in parallel. What is the total resistance of the circuit?

• 20 ohms
• 10 ohms
• 5 ohms
• 2.5 ohms

Question 14: When must a raceway system be completed between outlet, junction and splicing points?

• Before the conductors are installed
• Only after final inspection
• Whenever convenient
• After the conductors are pulled in

NEC Reference: NEC 300.18(A)

Question 15: Per NEC 430.22(A), the branch circuit conductor supplying a single continuous-duty motor must have an ampacity of not less than _____ percent of the motor full-load current (FLC).

• 100%
• 115%
• 125%
• 150%

NEC Reference: NEC 430.22(A)

Question 16: A motor controller's overload relay table lists a maximum branch-circuit fuse of 40 A, but Table 430.52 would allow 50 A. Which value governs?

• The average of the two, 45 A
• 50 A, since Table 430.52 is the Code rule
• Whichever value the installer prefers
• The 40 A overload relay table value

NEC Reference: NEC 430.52(C)(2)

Question 17: Generally, where must the overcurrent protection for a conductor be located?

• At the point where the conductor receives its supply
• Anywhere along the conductor
• At the load end of the conductor
• Only at the service

NEC Reference: NEC 240.21

Question 18: Cables run exposed on the surface of ceilings and sidewalls must be:

• Installed at least 8 ft above the floor
• Run only inside a raceway
• Painted to match the surface
• Supported so normal use won't damage them

NEC Reference: NEC 110.12(C)

Question 19: A single-phase 120-volt circuit draws 10 amperes and the load consumes 960 watts of true power. What is the power factor of this load?

• 0.96
• 0.80
• 0.75
• 1.0

Question 20: What is the minimum ampere rating required for the service disconnecting means of a single-family dwelling, per NEC 230.79(C)?

• 60 amperes
• 100 amperes
• 150 amperes
• 200 amperes

NEC Reference: NEC 230.79(C)

Question 21: A 240-volt branch circuit loses 6 V in its conductors. What is the voltage drop as a percentage?

• 1.5%
• 2.5%
• 4.0%
• 6.0%

Question 22: Which of the following is a permitted method of identifying an equipment grounding conductor (EGC) per NEC 250.119?

• Red insulation
• Green insulation
• Blue insulation
• Orange insulation

NEC Reference: NEC 250.119

Question 23: A recessed can light that is NOT listed for insulation contact (non-IC-rated) must be kept at least _____ inches away from thermal insulation.

• 1 inch
• 2 inches
• 3 inches
• 6 inches

NEC Reference: NEC 410.116(B)

Question 24: A balanced three-phase load is connected to a 208-volt (line-to-line) system and draws 10 amperes per line. What is the total apparent power?

• 2,080 volt-amperes
• 2,400 volt-amperes
• 3,600 volt-amperes
• 6,240 volt-amperes

Question 25: Under Table 314.16(B), how much volume is counted for each 12 AWG conductor in a box fill calculation?

• 1.75 cu in.
• 2.00 cu in.
• 2.25 cu in.
• 2.50 cu in.

NEC Reference: NEC Table 314.16(B)

Question 26: How is the terminal for the grounded (neutral) conductor identified on a receptacle?

• White (silver) metal or marked W
• A green hexagonal screw
• A brass-colored screw
• It is not identified

NEC Reference: NEC 200.10(B)

Question 27: A residential 120-volt, 20-ampere branch circuit with GFCI protection is run underground. What minimum cover does Table 300.5 permit for this circuit (Column 4)?

• 6 in.
• 12 in.
• 18 in.
• 24 in.

NEC Reference: NEC Table 300.5

Question 28: How must a multiconductor service-drop cable be attached to a building?

• With any plastic wire tie
• Wrapped around a porch post
• With ordinary conduit straps
• With identified service fittings

NEC Reference: NEC 230.27

Question 29: In a purely capacitive AC circuit, the current _____ the voltage by 90 degrees.

• Lags
• Is in phase with
• Leads
• Is 180 degrees opposite to

Question 30: A metal panelboard is supplied by PVC conduit with separate equipment grounding conductors. What must be provided inside the cabinet?

• Nothing more is required
• A second neutral bar for the EGCs
• An EGC terminal bar bonded to the cabinet
• A ground rod at the panel

NEC Reference: NEC 408.40