Journeyman Electrician Practice Test 12

Question 1: In an electric circuit, the drop in the feeders should not exceed ..............

• 2 %
• 3 %
• 5 %

Question 2: An electric circuit draws 200 VA of apparent power and 120 Watts, how much reactive power in VAR does the electric circuit draws.

• 160 VAR
• 180 VAR
• 150 VAR
• 140 VAR

Question 3: What is the minimum watts required per sq ft of floor area to determine the minimum number of lighting branch circuits

• 2 watts
• 3 watts
• 1 watts
• 4 watts

NEC Reference: NEC 220.12

Question 4: which of the following motor should never be used on a machine that is hard to start?

• DC Motor
• Capacitor Motor
• Split-Phase Motor

Question 5: If a motor is connected on 120 Volts electrical circuit, which of the following disconnecting switch is used?

• Single pole switch
• 2-pole switch

Question 6: If the motor is larger than 2HP. the disconnecting switch must be rated in horsepower not less than the horse power rating of the motor.

• True
• False

Question 7: If time delay fuses are used as short circuit protection for motors, the protection rating of fuse can be ................ percentage of rated current of power.

• 125
• 150
• 175
• 200

Question 8: How many 10 THHN conductors can be installed in trade size 1 EMT?

• 10 conductors
• 16 conductors
• 22 conductors
• 8 conductors

Question 9: What size service conductors are required for a dwelling load with a calculated load is 190 A. The service disconnect breaker is rated at 200 A?

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

NEC Reference: NEC 310.15(B)(16)

Question 10: Which is the minimum size copper conductor is required for the grounding electrode conductor (GEC) connected to a ground rod

• 6 AWG
• 8 AWG
• 10 AWG
• 12 AWG

NEC Reference: NEC 250.166(A)

Question 11: Which of the following device is required to detect and protect against arcing in 15- and 20-amp branch circuits supplying outlets installed in dwelling units?

• AFCI
• GFCI
• AFI
• GFFC

NEC Reference: NEC 210.12(A)

Question 12: The voltage shall not be greater than ………….. to supply listed electrical discharge lighting in dwelling units, hotels, and motels.

• 120 volts
• 240 volts
• 480 volts
• 277 volts

NEC Reference: NEC 210.6(A)

Question 13: What is the maximum rating of overcurrent devices protecting panelboard supplying potential transformers?

• 15 amperes
• 25 amperes
• 30 amperes
• 20 amperes

NEC Reference: NEC 408.52

Question 14: The overhead service conductors where the voltage does not exceed 300 volts passes over a residential property, drive-ways not to subject to truck traffic must have a minimum clearance of ……………

• 18 feet
• 12 feet
• 8 feet
• 10 feet

NEC Reference: NEC 230.24(B)(2)

Question 15: The live parts of the motor operating at 120 volts must be guarded.

• True
• False

NEC Reference: NEC 430.232

Question 16: In a split-phase motor, what automatically disconnects the starting winding after the motor reaches speed?

• A thermal overload relay
• A centrifugal switch
• A start capacitor
• The main breaker

Question 17: What makes an autotransformer different from a standard two-winding transformer?

• It uses two completely separate windings
• It has one winding used for both primary and secondary
• It can only step voltage up, never down
• It runs on DC power only

Question 18: What does a watt-hour meter measure?

• Current in amperes
• Voltage in volts
• Electrical energy in kilowatt-hours (kWh)
• Resistance in ohms

Question 19: What is the purpose of a demand factor in electrical load calculations?

• To increase the total calculated load
• To reduce the calculated load based on actual usage patterns
• To add a safety margin to the calculated load
• To determine the number of circuits needed

Question 20: When a single receptacle is installed on an individual branch circuit, its rating must be .............

• At least 80% of the circuit rating
• At least equal to the branch circuit ampere rating
• Less than the branch circuit rating
• There is no rating requirement for single receptacles

NEC Reference: NEC 210.21(B)(1)

Question 21: What is the minimum ampere rating of the service disconnecting means for a one-family dwelling?

• 30 amperes
• 60 amperes
• 100 amperes
• 200 amperes

NEC Reference: NEC 230.79(C)

Question 22: What two factors determine the speed of an AC induction motor?

• Supply voltage and motor current
• Number of poles and supply frequency
• Motor size and number of windings
• Line voltage and ambient temperature

Question 23: According to Joule's heating law, the heat produced in a conductor is proportional to .............

• The current only (I)
• The square of the current times resistance times time (I²Rt)
• The voltage times resistance (VR)
• The resistance only (R)

Question 24: Ground fault protection of equipment (GFPE) is required on solidly grounded wye services of .............

• 100 amperes or more
• 400 amperes or more
• 1000 amperes or more
• All services regardless of ampere rating

NEC Reference: NEC 230.95

Question 25: What is the minimum width of the working space required in front of electrical equipment?

• 18 inches
• 24 inches
• 30 inches
• 36 inches

NEC Reference: NEC 110.26(A)(2)

Question 26: A load consumes 8 kW of real power with a power factor of 0.80. What is the apparent power in kVA?

• 6.4 kVA
• 8 kVA
• 10 kVA
• 9.6 kVA

Question 27: What is a "dedicated circuit" in electrical wiring?

• A circuit with only one receptacle at the end
• A circuit that serves only one piece of equipment or outlet
• A circuit protected by a GFCI breaker
• A circuit installed with armored cable

Question 28: In a perfectly balanced 3-phase 4-wire wye system, what is the neutral conductor current?

• Equal to the phase current
• Three times the phase current
• Zero
• Half the phase current

Question 29: In a 3-phase 4-wire wye system with 208V between phases, what is the voltage from phase to neutral?

• 208 volts
• 240 volts
• 120 volts
• 277 volts

Question 30: In a standard 2-wire branch circuit, how does the size of the neutral conductor compare to the hot conductor?

• Half the size of the hot conductor
• At least the same size as the hot conductor
• Double the size of the hot conductor
• No neutral is needed in a 2-wire circuit

NEC Reference: NEC 210.19(A)