Journeyman Electrician Practice Test 34

Question 1: Why are the metal enclosures of electrical equipment connected to earth in a grounded system?

• To limit their voltage to ground
• To clear ground faults through the earth
• To reduce the electric bill
• To carry normal neutral current

NEC Reference: NEC 250.4(A)(2)

Question 2: What is the maximum voltage drop recommended for a 240-volt feeder?

• 4.8 V
• 6.0 V
• 7.2 V
• 12.0 V

NEC Reference: NEC 215.2(A) Informational Note

Question 3: A resistance-type electric space heater is rated 60 A. What does 424.22(B) require?

• Protect it with one 75 A breaker
• Use a GFCI breaker
• Nothing special is required
• Subdivide into loads of 48 A or less

NEC Reference: NEC 424.22(B)

Question 4: What is the smallest copper grounding electrode conductor listed in Table 250.66?

• 12 AWG
• 10 AWG
• 8 AWG
• 6 AWG

NEC Reference: NEC 250.66 and Table 250.66

Question 5: What may serve as the disconnecting means for a stationary motor rated ⅛ hp or less?

• The branch-circuit overcurrent device
• Only a horsepower-rated switch
• Only a plug and receptacle
• Nothing; no disconnect is needed

NEC Reference: NEC 430.109(B)

Question 6: What is the slip of a synchronous motor running at rated load?

• 100%
• About 3%
• Zero
• About 5%

Question 7: Which of the following electrical quantity is controlled using regulating transformer?

• voltage
• current
• power
• power factor

Question 8: Which of the following watts is equal to two Horse Power (HP) ?

• 1492 watts
• 1528 watts
• 746 watts
• 764 watts

Question 9: Locations where flammable gases or vapors may be present are classified as:

• Class I
• Unclassified
• Class III
• Class II

NEC Reference: NEC 500.5(B)

Question 10: When 5 current carrying conductors are grouped in a flexible cord, what is the conductor ampacity adjustment value?

• 90 %
• 80 %
• 70%
• 85%

NEC Reference: NEC 400.5(A)(3)

Question 11: In a dwelling kitchen, do the countertop receptacles count toward the wall-space receptacles required by 210.52(A)?

• Only if within 6 ft of the floor
• Yes, always
• Only in dining areas
• No; they are not counted

NEC Reference: NEC 210.52(A)(4)

Question 12: A building has two service disconnects in separate enclosures. Instead of a common GEC, individual GECs are used. How is each one sized?

• From Table 250.122
• By Table 250.66 for that disconnect
• All sized for the largest service
• Always 6 AWG copper

NEC Reference: NEC 250.64(D)(2)

Question 13: Per NEC 300.4(A)(1), when NM cable or other cable is run through a hole in a wood framing member and the edge of the hole is less than _____ inch(es) from the nearest edge of the framing member, a steel plate (at least 1/16 inch thick) must be installed to protect the cable.

• 1/2 inch
• 1 inch
• 1-1/4 inches
• 2 inches

NEC Reference: NEC 300.4(A)(1)

Question 14: Compared to a No. 12 AWG copper conductor, a No. 10 AWG copper conductor of the same length has _____ resistance.

• Higher resistance
• The same resistance
• Lower resistance
• Cannot be compared

Question 15: What must a panelboard have to limit the number of overcurrent devices installed in it?

• Physical means limiting the device count
• A locked cover
• A circuit directory
• A warning label only

NEC Reference: NEC 408.54

Question 16: When applying 430.24, how is the "highest rated" motor in a group determined?

• By physical size
• By nameplate locked-rotor current
• By horsepower
• By table full-load current

NEC Reference: NEC 430.17

Question 17: What is the relationship between watts and joules?

• 1 watt = 1 joule per minute
• 1 watt = 1 joule per second
• 1 watt = 1,000 joules
• 1 watt = 1 joule per hour

Question 18: A 3-wire, 120/240-volt multiwire branch circuit is protected by two single-pole breakers without a handle tie. What loads may it serve?

• Any 240-volt load
• Only motor loads
• Only line-to-neutral loads
• Any load at all

NEC Reference: NEC 210.4(C)

Question 19: Receptacles installed on 15- and 20-ampere branch circuits must be of what type (except as permitted for replacements)?

• Twist-lock type
• Grounding type
• Isolated-ground type
• Non-grounding type

NEC Reference: NEC 406.4(A)

Question 20: Liquidtight flexible metal conduit connects a motor in a Class I, Division 2 location. What grounding/bonding is required?

• Only a locknut bond
• A bonding jumper in parallel with it
• None; the conduit is enough
• A ground rod at the motor

NEC Reference: NEC 501.30(B)

Question 21: A 240-volt circuit supplies a resistive load with a resistance of 30 ohms. What is the current flowing in the circuit?

• 30 amperes
• 16 amperes
• 8 amperes
• 4 amperes

Question 22: At a service head, how must service-entrance conductors of different potential be brought out?

• Through the side of the mast
• Taped together in a bundle
• Through separately bushed openings
• All through one large opening

NEC Reference: NEC 230.54(E)

Question 23: A conductor may not be used where its operating temperature will exceed:

• The temperature rating of its insulation
• 200 °C in all cases
• The ambient temperature
• The temperature of the terminals only

NEC Reference: NEC 310.14(A)(3)

Question 24: A feeder supplies branch circuits that require equipment grounding conductors. What does 215.6 require of the feeder?

• Nothing
• It must have a ground rod at the panel
• Its neutral may serve as the EGC
• It must include or provide an equipment grounding conductor

NEC Reference: NEC 215.6

Question 25: Per NEC 240.21(B)(1), feeder tap conductors not more than 10 feet long shall not extend beyond the _____ they supply.

• Utility transformer
• Switchboard, panelboard, disconnecting means, or control device they supply
• Next junction box
• 10 feet beyond the feeder tap point

NEC Reference: NEC 240.21(B)(1)

Question 26: A building is supplied by both a feeder and a separate service. What does 225.37 require?

• Nothing
• A single combined disconnect
• A directory of all other supplies
• A key interlock

NEC Reference: NEC 225.37

Question 27: What may serve as the disconnecting means for a cord-connected room air conditioner or household refrigerator?

• Only the panel breaker
• A plug and receptacle (or connector)
• Only a separate fused switch
• The thermostat

NEC Reference: NEC 440.13

Question 28: What is the kVA capacity of a 120/240-volt, single-phase, 100-ampere service?

• 41.6 kVA
• 24 kVA
• 17.3 kVA
• 12 kVA

Question 29: A detached dwelling accessory building (such as a shed) has electric power. What receptacle is required?

• At least one receptacle outlet
• One on each wall
• None
• One every 12 ft

NEC Reference: NEC 210.52(G)(2)

Question 30: Who must perform the testing, evaluation and listing of electrical products?

• The local inspector
• The installing electrician
• The manufacturer alone
• Qualified testing laboratories

NEC Reference: NEC 110.3(C)