Journeyman Electrician Practice Test 25

Question 1: Flexible metal conduit (FMC) is NOT permitted:

• In wet locations
• Exposed in commercial buildings
• In dry locations
• For motor connections

NEC Reference: NEC 348.12

Question 2: A 120/240-volt, single-phase dwelling service is rated 250 A. Using Table 310.12, what is the minimum size copper service-entrance conductor?

• 4/0 AWG
• 3/0 AWG
• 2/0 AWG
• 1/0 AWG

NEC Reference: NEC 310.12 and Table 310.12

Question 3: Trade size ¾ liquidtight flexible metal conduit (LFMC) connects a motor where flexibility is needed after installation. How long may it be left unsupported at the motor terminal?

• 12 in.
• 18 in.
• 3 ft
• 6 ft

NEC Reference: NEC 350.30(A) Exception No. 2

Question 4: Article 100 defines an "appliance" as:

• Any equipment whose main job is to carry or control current
• Standardized utilization equipment, such as for cooking or washing
• Equipment designed for outdoor use only
• Any device rated 15 A or less at 120 V

NEC Reference: NEC Article 100

Question 5: Fixed outdoor electric snow-melting equipment (heating cable in a driveway) must have what kind of protection?

• No special protection is required
• AFCI protection on the circuit
• Surge protection at the panel only
• Ground-fault protection (GFPE)

NEC Reference: NEC 426.28

Question 6: Motor overload protection (Part III of Article 430) is intended to protect motors and conductors against:

• Lightning and switching surges
• Short circuits only
• Overheating from overload or failure to start
• Ground faults only

NEC Reference: NEC 430.31

Question 7: A panelboard is equipped with snap switches rated 30 A or less. What is the maximum rating of the overcurrent protection for the panelboard?

• 400 A
• 200 A
• 150 A
• 100 A

NEC Reference: NEC 408.36(A)

Question 8: A single-phase, cord-and-plug-connected room air conditioner must be provided with which factory-installed protection?

• A time-delay fuse in the attachment plug
• A surge-protective device in the plug
• A GFCI built into the receptacle
• An LCDI, AFCI or HDCI device

NEC Reference: NEC 440.65

Question 9: What happens to the speed of a loaded induction motor when its mechanical load increases?

• It decreases slightly as slip increases
• It increases
• It stays exactly at synchronous speed
• It drops to zero

Question 10: A running 3-phase motor loses one phase (single-phasing) because one fuse blows. What normally happens?

• It speeds up because load is lost
• It runs on, overheating from high current
• It reverses its direction of rotation
• It stops at once and cannot restart

Question 11: A motor has no service factor marking. Per NEC 430.32(A)(1), what is the maximum overload protection rating as a percentage of the motor's full load current?

• 125%
• 115%
• 100%
• 140%

NEC Reference: NEC 430.32(A)(1)

Question 12: A single motor has a full-load current of 24 A from the NEC motor tables. What minimum ampacity must its branch-circuit conductors have?

• 24 A
• 28 A
• 30 A
• 36 A

NEC Reference: NEC 430.22

Question 13: A motor has a full load current of 20 amperes. Using a dual-element (time-delay) fuse for branch circuit short-circuit protection, the maximum fuse rating per NEC 430.52 and Table 430.52 is .............

• 20 amperes
• 35 amperes
• 40 amperes
• 50 amperes

NEC Reference: NEC 430.52

Question 14: A 20-ampere, 120-volt branch circuit is the ONLY load on the circuit and supplies a cord-and-plug window air conditioner. What is the maximum full load current the air conditioner may draw?

• 20 amperes
• 16 amperes
• 15 amperes
• 18 amperes

NEC Reference: NEC 440.62(B)

Question 15: If GFCI protection IS provided on a transformer secondary supplying impedance heating elements, what is the maximum secondary voltage allowed?

• 30 volts
• 80 volts
• 120 volts
• 50 volts

NEC Reference: NEC 427.27

Question 16: Per NEC Article 100, an electrical "device" is defined as a unit of equipment intended to .............

• Utilize electrical energy to do work
• Carry or control electric energy
• Generate electrical energy
• Convert electrical energy to light only

NEC Reference: NEC 100

Question 17: What is the minimum trade size of flexible metal conduit (FMC) permitted for tap connections to luminaires?

• ½ in.
• ¾ in.
• ⅜ in.
• ¼ in.

NEC Reference: NEC 348.20(A)(2)

Question 18: In an induction motor, if the supply voltage drops by 10%, what happens to the starting torque?

• Starting torque increases by 10%
• Starting torque decreases to about 81% of rated value (drops about 19%)
• Starting torque drops by exactly 10%
• Starting torque is not affected by voltage

Question 19: Power factor (PF) is defined as the ratio of .............

• Apparent power to true power
• True power to apparent power
• Reactive power to apparent power
• True power to reactive power

Question 20: Each panelboard must be protected on its supply side by an overcurrent device rated not more than:

• The total connected load
• The ampere rating of the panelboard
• 200 A, regardless of the panelboard rating
• 125% of the panelboard rating

NEC Reference: NEC 408.36

Question 21: The disconnecting means for a hermetic refrigerant motor-compressor must be located .............

• Anywhere in the building
• Within sight of and readily accessible from the equipment
• At the main electrical panel only
• Adjacent to the meter socket

NEC Reference: NEC 440.14

Question 22: What minimum ampacity must branch circuit conductors have for a single hermetic refrigerant motor-compressor?

• 100% of the rated load current
• 125% of the rated load current or branch circuit selection current (whichever is larger)
• 150% of the rated load current
• 80% of the rated load current

NEC Reference: NEC 440.32

Question 23: What is the maximum fill percentage for more than two conductors in a conduit or raceway?

• 53%
• 40%
• 31%
• 60%

Question 24: EMT couplings and connectors are embedded in a concrete slab. What type must they be?

• Insulated throat type only
• Any set-screw type
• Raintight compression type only
• Concrete-tight type

NEC Reference: NEC 358.42

Question 25: Flexible Metal Conduit (FMC) must be supported at intervals not exceeding .............

• 3 feet
• 4.5 feet
• 6 feet
• 10 feet

NEC Reference: NEC 348.30(A)

Question 26: An equipment grounding conductor (EGC) that is individually covered or insulated must be identified with .............

• White or gray color
• Green or green with yellow stripes
• Red color
• Orange color

NEC Reference: NEC 250.119

Question 27: What color must an insulated grounded conductor (neutral) be identified with for sizes No. 6 AWG and smaller?

• Green or bare
• White or gray
• Red
• Any color not already used for hot conductors

NEC Reference: NEC 200.6(A)

Question 28: Ungrounded (hot) conductors must NOT be identified with which colors?

• White, gray or green
• Blue and orange
• Black and red
• Brown and yellow

NEC Reference: NEC 310.6(C), 200.6 and 250.119

Question 29: A supply-side bonding jumper is used where service conductors pass through separate enclosures. How is its size determined?

• Same size as the service conductors always
• Per NEC Table 250.102(C)(1) based on service conductor size
• Minimum No. 6 AWG copper always
• Based on the load current calculation

NEC Reference: NEC 250.102(C)

Question 30: Induction motor starting (locked rotor) current is typically how many times the full load running current?

• 1 to 2 times FLC
• 6 to 8 times FLC
• 2 to 3 times FLC
• 10 to 15 times FLC