Journeyman Electrician Practice Test 27

Question 1: How many maximum No. 8 AWG conductors can fit in a 4-inch × 1-1/2-inch square metal box?

• 7
• 4
• 8
• 9

NEC Reference: NEC 314.16(B)

Question 2: What is the minimum free space required for No 12 AWG conductor with in the metal box?

• 2.25
• 2.5
• 2
• 1.75

NEC Reference: NEC 314.16(B)

Question 3: <span style="font-size: 14pt;">The total maximum bend of a FMC  between two pull points is which of the following?</span>

• 90 degrees
• 240 degrees
• 360 degrees
• 180 degrees

NEC Reference: NEC 348.26

Question 4: <span style="font-size: 14pt;">A single phase motor 5 HP , 230 volts motor has a full load current rating is 32 amperes, What is the full load conductor size that can be used?</span>

• No 8 THWN
• No 6 THWN
• No 10 THWN
• No 12 THWN

NEC Reference: NEC 430.22

Question 5: The grounded conductor terminal shall terminate with in the panel board in an individual terminal.

• True
• False

NEC Reference: NEC 408.41

Question 6: <span style="font-size: 14pt;">Which of the following is the length of the 120 volt flexible cord that  supplies a room air-conditioner?</span>

• 10 ft
• 6 ft
• 8 ft
• 9 ft

NEC Reference: NEC 440.64

Question 7: Amusement rides or carnival rides cannot be located less than .......................... in any direction from over head lines

• 20 feet
• 15 feet
• 12 feet
• 8 feet

NEC Reference: NEC 525.5

Question 8: If the temperature of an conducting material increases, then the resistance of the conducting material ...............................

• Increases
• Decreases
• Remains Constant

Question 9: Which of the following is the minimum service size per mobile home in a mobile park?

• 20000 volt-amperes
• 16000 volt-amperes
• 10000 volt-amperes
• 18000 volt-amperes

NEC Reference: NEC 550.31(1)

Question 10: When the supply frequency decreases the inductive reactance will ......................

• Decrease
• Increase
• Remains constant

Question 11: Per NEC Table 314.16(B), what is the volume allowance per conductor for No. 12 AWG wire?

• 2.00 cubic inches
• 2.25 cubic inches
• 1.75 cubic inches
• 2.50 cubic inches

NEC Reference: NEC Table 314.16(B)

Question 12: A metal box has 18.0 cubic inches of volume. Using No. 12 AWG conductors only (2.25 cubic inches each), how many conductors can fit if there is also one receptacle device installed?

• 8 conductors
• 6 conductors
• 4 conductors
• 10 conductors

NEC Reference: NEC 314.16(B)

Question 13: Per NEC 440.64, the flexible cord supply for a 120-volt room air conditioner must not exceed .............

• 6 feet
• 10 feet
• 15 feet
• 8 feet

NEC Reference: NEC 440.64

Question 14: Amusement rides and carnival rides must not be located less than ............. from overhead utility lines.

• 8 feet
• 15 feet
• 20 feet
• 10 feet

NEC Reference: NEC 525.5(B)

Question 15: What happens to the resistance of a copper conductor when its temperature increases?

• Decreases
• Increases
• Remains constant regardless of temperature
• First increases then decreases

Question 16: Per NEC 550.31(A), what is the minimum electrical service provided for each mobile home lot in a mobile home park?

• 50 amperes
• 100 amperes
• 200 amperes
• 60 amperes

NEC Reference: NEC 550.31(A)

Question 17: If the supply frequency of an AC circuit is reduced from 60 Hz to 50 Hz, the inductive reactance (XL) will .............

• Increase
• Decrease
• Remain constant
• Become zero

Question 18: In a panelboard, can two grounded (neutral) conductors share the same terminal?

• Yes — two neutrals per terminal are always acceptable
• No — each neutral must have its own individual terminal
• Yes — as long as they are both from 15A circuits
• Yes — if the terminal is rated for the total current

NEC Reference: NEC 408.41

Question 19: A circuit breaker used as the supply to a panelboard (back-fed breaker acting as main disconnect) must be .............

• A different color than branch circuit breakers
• Physically secured or fastened to prevent removal without tools
• Rated for only 80% of the panel ampacity
• A double-pole breaker at all times

NEC Reference: NEC 408.3(F)(1)

Question 20: What is the volume of a 4-inch square metal box with a 2-1/8 inch depth per NEC Table 314.16(A)?

• 21.0 cubic inches
• 30.3 cubic inches
• 18.0 cubic inches
• 25.0 cubic inches

NEC Reference: NEC Table 314.16(A)

Question 21: Per NEC 430.37, how many overload devices are required for a standard 3-phase motor that does not have other approved motor protection?

• One overload device in any one phase
• Three overload devices, one in each phase
• Two overload devices in any two phases
• No overload devices if a circuit breaker protects the motor

NEC Reference: NEC 430.37

Question 22: In a 120/208V 3-phase wye (Y) system, what is the relationship between phase-to-neutral voltage and line-to-line voltage?

• Line-to-line voltage equals phase-to-neutral voltage
• Line-to-line voltage equals √3 (1.732) times phase-to-neutral voltage
• Line-to-line voltage equals 2 times phase-to-neutral voltage
• Line-to-line voltage equals 3 times phase-to-neutral voltage

Question 23: In a 480/277V, 3-phase, 4-wire wye system, what voltage is available for single-pole (120V type) lighting circuits?

• 120 volts
• 277 volts
• 480 volts
• 208 volts

Question 24: Using an inverse time circuit breaker for motor branch circuit short-circuit protection, the maximum breaker size as a percentage of motor FLC per NEC Table 430.52 is .............

• 125%
• 250%
• 300%
• 175%

NEC Reference: NEC 430.52

Question 25: Type NM cable (Romex) is NOT permitted to be used in which of the following buildings?

• Single-family dwellings
• Buildings of Type I or Type II fire-resistive construction
• Townhouses and condominiums
• Garages attached to homes

NEC Reference: NEC 334.12(B)

Question 26: In a dwelling unit garage, GFCI protection is required for all 125-volt, single-phase, 15- and 20-ampere receptacles. This requirement applies to .............

• Only receptacles within 6 feet of the floor drain
• All receptacles in the garage
• Only receptacles used for power tools
• Only receptacles at counter height

NEC Reference: NEC 210.8(A)(2)

Question 27: GFCI protection is required for all receptacles in which dwelling locations?

• Only bathrooms and kitchens
• Bathrooms, garages, outdoors, crawl spaces, unfinished basements, kitchens, and other wet/damp locations
• Only areas with water pipes
• Only outdoor and wet locations

NEC Reference: NEC 210.8(A)

Question 28: A separately derived system (such as a transformer secondary) must have a system bonding jumper connecting the grounded conductor to .............

• The utility neutral only
• The equipment grounding conductor and the derived system enclosure
• The downstream distribution panel neutral
• A ground rod electrode

NEC Reference: NEC 250.30(A)(1)

Question 29: Where must the grounding electrode connection be made for a separately derived system?

• At the main service panel only
• As near as practicable to the separately derived system source
• Outside the building at the utility connection point
• At any available ground rod on the property

NEC Reference: NEC 250.30(A)(3)

Question 30: Surface metal raceways (Wiremold) are NOT permitted to be used in which of the following?

• Dry office spaces
• Hoistways or elevator shafts
• Exposed wall surfaces
• Commercial kitchens

NEC Reference: NEC 386.12