Journeyman Electrician Practice Test 28

Question 1: Flexible metal conduit (FMC) connects a motor where flexibility is needed to reduce vibration. What does 348.60 require?

• Liquidtight FMC must be used instead
• A separate ground rod at the motor
• Nothing; FMC always serves as the EGC
• An EGC must be installed

NEC Reference: NEC 348.60

Question 2: A 4,160-volt switchgear has exposed live parts on both sides of the working space (Condition 3). What is the minimum working space depth?

• 4 ft
• 5 ft
• 6 ft
• 9 ft

NEC Reference: NEC 110.34(A) and Table 110.34(A)

Question 3: In a dwelling unit, a 40-ampere or 50-ampere branch circuit may supply:

• General-purpose receptacles
• Fixed lighting with standard lampholders
• Several 15-ampere receptacles
• Fastened-in-place cooking appliances

NEC Reference: NEC 210.23(C)

Question 4: On a 3-phase, 3-wire, corner-grounded delta system, which conductor is the grounded conductor?

• One phase conductor
• The equipment grounding conductor
• None; corner-grounded systems have no grounded conductor
• The neutral

NEC Reference: NEC 250.26

Question 5: Receptacles that provide shore power for boats must have ground-fault protection of equipment set at not more than:

• 5 mA
• 30 mA
• 100 mA
• 300 mA

NEC Reference: NEC 555.35(A)(1)

Question 6: The disconnecting means for a marina shore-power receptacle must be readily accessible and not more than how far from the receptacle it controls?

• 12 in.
• 30 in.
• 6 ft
• 50 ft

NEC Reference: NEC 555.36

Question 7: A conductor has 0.5 Ω of resistance and carries 4 A. What is the power lost as heat in the conductor?

• 2 W
• 4 W
• 8 W
• 32 W

Question 8: A dwelling unit has a general lighting load of 8,000 VA. What is the demand load after applying Table 220.45?

• 8,000 VA
• 6,000 VA
• 5,550 VA
• 4,750 VA

NEC Reference: NEC 220.45 and Table 220.45

Question 9: Table 310.16 ampacities are based on what conditions?

• 40 °C ambient, any number of conductors
• 30 °C ambient, up to 3 conductors
• 20 °C ambient, conductors in free air
• 30 °C ambient, up to 6 conductors

NEC Reference: NEC Table 310.16

Question 10: Lenz's law states that the current induced in a circuit flows in a direction that:

• Opposes the change in flux
• Is always clockwise around the coil
• Aids the change in flux that caused it
• Does not depend on the flux at all

Question 11: A 2,400-volt motor controller has exposed live parts on one side of the working space and a concrete wall (grounded) on the other side. What is the minimum working space depth?

• 6 ft
• 5 ft
• 4 ft
• 3 ft

NEC Reference: NEC 110.34(A) and Table 110.34(A)

Question 12: A junction box contains the neutrals of several different circuits. What does 200.4(B) require?

• All neutrals spliced together in one connector
• Nothing, as long as all neutrals are white
• Each circuit's neutral in a separate box
• Grouped with their own hot conductors

NEC Reference: NEC 200.4(B)

Question 13: Six current-carrying conductors are in one raceway. By what factor must their ampacity be adjusted?

• 50%
• 70%
• 80%
• 90%

NEC Reference: NEC 310.15(C)(1) and Table 310.15(C)(1)

Question 14: An apartment building (dwelling units) has a total general lighting load of 150,000 VA. What is the demand load under Table 220.45?

• 37,500 VA
• 51,450 VA
• 52,500 VA
• 150,000 VA

NEC Reference: NEC 220.45 and Table 220.45

Question 15: Ground fault protection at a marina protects against which danger specific to marinas?

• Flooding of the electrical panels
• Electric shock drowning from current leaking into the water
• Lightning strikes on masts
• Overloading of shore power cords

Question 16: Fleming's left-hand rule is used to determine the direction of .............

• Induced EMF in a generator
• Force (motion) on a current-carrying conductor in a motor
• Direction of magnetic flux
• Direction of electron flow in a conductor

Question 17: Coulomb's Law states that the force between two electric charges is .............

• Proportional to the distance between charges
• Proportional to the product of the charges and inversely proportional to the square of the distance
• Always attractive regardless of charge type
• Equal to the voltage between the charges

Question 18: What is the minimum cover for conductors in rigid metal conduit (RMC) buried under a lawn (not under a building or driveway)?

• 6 in.
• 12 in.
• 18 in.
• 24 in.

NEC Reference: NEC Table 300.5

Question 19: How must underground cables and conductors installed under a building be run?

• In a raceway
• In any cable listed for direct burial
• Direct buried at 24 in.
• Encased in 2 in. of concrete only

NEC Reference: NEC 300.5(C)

Question 20: Faraday's Law of Electromagnetic Induction states that an EMF is induced in a conductor when .............

• Current flows through it
• There is a change in the magnetic flux linking it
• Voltage is applied to it
• It is placed in a static magnetic field

Question 21: For a 25-foot feeder tap conductor, the ampacity of the tap conductor must be at least ............. of the OCPD rating protecting the feeder.

• 1/2 (50%)
• 1/3 (33%)
• 1/4 (25%)
• 1/10 (10%)

NEC Reference: NEC 240.21(B)(2)

Question 22: A tap conductor no longer than 10 feet may be connected to a feeder if the tap conductor's ampacity is not less than ............. of the overcurrent device protecting the feeder.

• 1/3 (33%)
• 1/10 (10%)
• 1/4 (25%)
• 1/2 (50%)

NEC Reference: NEC 240.21(B)(1)

Question 23: In an AC circuit with a total impedance of 10 ohms connected to 120V, what is the current?

• 1200 amperes
• 12 amperes
• 10 amperes
• 120 amperes

Question 24: When connecting Flexible Metal Conduit (FMC) to boxes and fittings, what type of connectors must be used?

• Any available metallic fitting
• Listed fittings identified for use with FMC
• EMT compression fittings
• Taped connections without fittings

NEC Reference: NEC 348.42

Question 25: The disconnecting means for a motor must be located .............

• At the main electrical panel only
• Within sight from the motor controller and accessible
• Anywhere within 100 feet of the motor
• At the nearest junction box

NEC Reference: NEC 430.102(A)

Question 26: Per NEC Article 100, "within sight from" (or "in sight from") means .............

• In the same room regardless of distance
• Visible and not more than 50 feet away
• Visible and not more than 100 feet away
• In the same building

NEC Reference: NEC 100

Question 27: Which of these is NOT one of the considerations 110.3(A) lists for judging equipment?

• Heating effects under conditions of use
• Wire-bending and connection space
• The purchase price of the equipment
• Mechanical strength and durability

NEC Reference: NEC 110.3(A)

Question 28: Article 100 defines "accessible (as applied to equipment)" as:

• Reachable quickly without ladders or tools
• Located inside a locked room
• Visible from 50 ft away
• Reachable for operation, renewal and inspection

NEC Reference: NEC Article 100

Question 29: A detached garage on residential property is supplied by one branch circuit from the house. What may serve as the garage's building disconnecting means?

• The receptacle inside the garage
• A snap switch (or 3-way/4-way set)
• Only a fused, service-rated switch
• No disconnect is required

NEC Reference: NEC 225.36 Exception

Question 30: An ammeter used to measure current in a circuit must be connected .............

• In parallel with the load
• In series with the circuit
• Across the voltage source
• At the panel only