Journeyman Electrician Practice Test 20

Question 1: If the distance between pole and building is less than 40 ft, which of the following wire that can be used as overhead span?

• No 10
• No 6
• No 8

Question 2: The standby power plants should have the fuel supply to supply the full load of at lest ...................... hours.

• 2
• 3
• 1
• 4

Question 3: Convert the temperature of 45 ⁰ C in to temperature in degree F? ......................

• 81
• 113°F
• 25

Question 4: two mobile homes with assumed capacity of 1000 watts at 115/230 volts are connected on one feeder, what is the minimum watt per mobile home site?

• 1000 watts
• 550 watts
• 330 watts
• 500 watts

NEC Reference: NEC 550.31

Question 5: A 800 ft apartment consists of three appliances. calculate the total net computed power in the apartment?

• 5940 watts
• 11400 watts
• 9400 watts
• 8940 watts

Question 6: When the temperature on the branch circuit conductor increases it leaks more current.

• True
• False

Question 7: The maximum ampacity of No 12 size wire is ............................

• 20 amperes
• 40 amperes
• 65 amperes
• 45 amperes

Question 8: The resistance of the large wire higher when used in an ac circuit than when in a dc circuit.

• True
• False

Question 9: Type T wire can only be used in wet location where the temperature of the will not exceed 60⁰ C at its full loaded condition.

• True
• False

Question 10: As per NEC 100 ,the continuous load defines, the load on a feeder or branch circuit likely to continue ............... hours or longer.

• 3
• 2
• 1
• 4

Question 11: A circuit has a 120-volt supply and a total resistance of 15 ohms. What is the current in the circuit?

• 4 amperes
• 6 amperes
• 8 amperes
• 12 amperes

Question 12: A 240-volt load draws 20 amperes of current. What is the power consumption?

• 2400 watts
• 4800 watts
• 6000 watts
• 9600 watts

Question 13: In a series circuit, what is true about the current?

• Current is different through each component
• The same current flows through every component
• Current is highest at the first component
• Current is zero at the last component

Question 14: In a parallel circuit, what is true about the voltage across each branch?

• Voltage is different in each branch
• The same voltage appears across every branch
• Voltage decreases with each parallel branch added
• Voltage doubles when a second branch is added

Question 15: A transformer has 480 volts on the primary and a turns ratio of 4:1. What is the secondary voltage?

• 60 volts
• 120 volts
• 240 volts
• 1920 volts

Question 16: A 10 kVA transformer steps voltage down from 480V to 120V. What is the maximum secondary current?

• 20.8 amperes
• 41.7 amperes
• 83.3 amperes
• 166.7 amperes

Question 17: Why is it important to follow the manufacturer's instructions when installing listed electrical equipment?

• Only if the equipment is more than 5 years old
• Because NEC 110.3(B) requires listed equipment to be installed per manufacturer instructions
• Only in commercial buildings, not residential
• Instructions are suggestions only and do not have legal force

NEC Reference: NEC 110.3(B)

Question 18: A conduit body (LB, LL, LR, T, etc.) can be used as a junction box if .............

• All conduit bodies are always approved for splices
• The volume is marked on the body and meets fill requirements
• Conduit bodies can never be used as junction boxes
• Only if it is a T-shaped conduit body

NEC Reference: NEC 314.16(C)(2)

Question 19: An outdoor 15- or 20-ampere receptacle that is accessible to the public must have what type of cover?

• A standard flip-lid cover is enough for any outdoor receptacle
• An "in-use" cover that remains weatherproof even while a cord is plugged in
• A GFCI receptacle without a cover is allowed outdoors
• Any metal box cover provides enough outdoor protection

NEC Reference: NEC 406.9(B)(1)

Question 20: The disconnecting means for a motor must be within sight of the motor controller unless .............

• The motor is less than 1 horsepower
• It is capable of being locked in the open (off) position
• The controller has its own built-in disconnect
• The motor is indoors and not near water

NEC Reference: NEC 430.102(B)

Question 21: According to NEC 400.12, flexible cord cannot be used as a substitute for .............

• Flexible cord can always be used instead of NM cable
• Fixed building wiring of a structure
• Flexible cord can replace conduit in dry locations
• Only the neutral wire can be flexible cord

NEC Reference: NEC 400.12

Question 22: What type of luminaire is NOT allowed in a clothes closet according to NEC 410.16?

• Totally enclosed LED surface-mounted fixture
• Surface-mounted fluorescent fixture with 12-inch clearance
• Pendant-type incandescent fixture with open lamp
• Recessed LED downlight with solid lens

NEC Reference: NEC 410.16

Question 23: What is the difference between bonding and grounding?

• They are the same thing with different names
• Grounding connects to earth; bonding connects conductive parts to equalize potential
• Bonding connects to earth; grounding connects metal parts together
• Grounding is only for high-voltage systems

NEC Reference: NEC 100

Question 24: Why should the neutral (grounded) conductor never be switched in a branch circuit?

• Because the neutral carries higher current than the hot wire
• Switching the neutral can leave the chassis energized creating a shock hazard
• There is no reason — the neutral can always be switched
• Only because the wire is white and white wires cannot be switched

NEC Reference: NEC 404.2(B)

Question 25: As the temperature of a copper conductor increases, its electrical resistance .............

• Decreases
• Increases
• Stays the same
• First increases then drops to zero

Question 26: What is the key difference between a GFCI and an AFCI?

• GFCI protects against arcing; AFCI protects against shock
• GFCI protects against shock; AFCI protects against arcing fire hazards
• They are the same device with different names
• Neither provides shock protection — only circuit breakers do

Question 27: NM cable (Romex) may be buried underground at all.

• True — NM cable can be buried 24 inches deep
• False — NM cable is not approved for underground or wet locations
• True — NM cable can be buried 6 inches deep in PVC conduit
• True — NM cable can be buried if wrapped with waterproof tape

NEC Reference: NEC 334.12(B)

Question 28: In a kitchen, countertop receptacles must be placed so that no point along the countertop is more than how far from a receptacle?

• 12 inches
• 24 inches
• 36 inches
• 48 inches

NEC Reference: NEC 210.52(C)(1)

Question 29: In a switch loop using 2-wire NM cable, the white wire is used as the ungrounded (hot) conductor returning to the switch. The white wire must be .............

• Left as white — no marking is needed for switch loops
• Re-identified with black tape or paint at each termination point
• Painted green to show it is the equipment ground in the loop
• Wrapped with gray tape to indicate it is a switched neutral

NEC Reference: NEC 200.7(C)(2)

Question 30: Before working on any electrical circuit, what is the most important safety step?

• Put on rubber gloves and work hot (energized)
• De-energize the circuit and verify with a meter that it is dead before touching any wires
• Just flip the light switch off and start working
• Ask your supervisor if the circuit is off