Journeyman Electrician Practice Test 17

Question 1: The minimum distance that service drop wire should maintain if it is placed above the roads and driveways is .................

• 10 ft
• 15 ft
• 18 ft
• 12 ft

Question 2: The non motor operated appliance rating is 20 amperes which is supplied by a single branch circuit. what is the minimum ampere rating of branch circuit?

• 25 amperes
• 30 amperes
• 20 amperes
• 24 amperes

Question 3: Every appliance must be provided with a disconnecting means from the circuit for repairing it safely.

• True
• False

Question 4: A 4500 watt water heater is operated at 240 volts, what is the size of branch circuit that can be used for connecting it?

• 10 AWG
• 12 AWG
• 14 AWG
• 8 AWG

Question 5: If only one room air conditioner is connected to a branch circuit, the maximum name plate rating of equipment should not exceed ............ % of the circuit.

• 80 %
• 60 %
• 70 %
• 75 %

Question 6: A reliable conductor to ensure the required electrical conductivity between metal parts required to electrically connected is termed as ………………….

• Branch conductor
• Bonding conductor
• Grounding conductor
• Coupling conductor

NEC Reference: NEC 100.1

Question 7: The total current delivered by two series connected batteries is 2 A, what is the carrying current of each battery?

• 1 A
• 2 A
• 4 A
• 0.5 A

Question 8: If the leakage factor of 10 KW motor is 1.2, what is the leakage factor of a 20 KW electric motor?

• 0.6
• 1.15
• 2.40
• 4.80

Question 9: The most suitable motor for commercial refrigerator is .................................

• shaded pole motor
• repulsion start induction run
• universal motor

Question 10: one watt is equal to ..........................

• one joule per second
• one ohm per second
• one volt per second

Question 11: The minimum size copper equipment grounding conductor for a 100 amperes circuit is …………….

• 8 AWG
• 10 AWG
• 6 AWG
• 12 AWG

NEC Reference: NEC 250.122

Question 12: How many number of service disconnects per service are allowed to be grouped in any one location?

• Four
• Five
• Six
• Seven

NEC Reference: NEC 230.71(A)

Question 13: What is the maximum size fuse allowed to protect 12 AWG THW copper branch conductor?

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

NEC Reference: NEC 240.4(D)(5)

Question 14: The maximum wattage of incandescent-lamps must not exceed …………… that may be used on medium bus lampholders.

• 200 watts
• 300 watts
• 400 watts
• 500 watts

NEC Reference: NEC 410.103

Question 15: Under normal conditions, how should be the voltmeter is connected to measure the voltage of the circuit or device?

• In series
• In parallel
• Both series and parallel
• None

Question 16: A motor connected to a 240-volt single-phase circuit must have what type of disconnect switch?

• Single-pole switch
• 2-pole (double-pole) switch
• 3-pole switch
• No disconnect switch is needed for 240V motors

Question 17: What happens to the resistance of a copper wire as its temperature increases?

• Resistance decreases
• Resistance stays the same
• Resistance increases
• Resistance becomes zero

Question 18: What happens to inductive reactance (XL) when the frequency of the AC supply increases?

• Inductive reactance decreases
• Inductive reactance stays the same
• Inductive reactance increases
• Inductive reactance becomes zero

Question 19: What happens to capacitive reactance (XC) when the frequency of the AC supply increases?

• Capacitive reactance increases
• Capacitive reactance decreases
• Capacitive reactance stays the same
• Capacitive reactance becomes infinite

Question 20: In an AC circuit, electrical resonance occurs when .............

• Resistance equals inductance (R = L)
• Inductive reactance equals capacitive reactance (XL = XC)
• Voltage equals current (V = I)
• Power factor equals zero

Question 21: What is the formula for total true power in a balanced 3-phase circuit?

• P = VL × IL × PF
• P = √3 × VL × IL × PF
• P = 3 × VL × IL × PF
• P = VL × IL / √3

Question 22: What is the maximum permitted length of flexible metal conduit (FMC) for a connection to a motor or equipment?

• 3 feet
• 6 feet
• 10 feet
• No length limit for FMC

NEC Reference: NEC 348.20(A)(1)

Question 23: Where are tamper-resistant receptacles required by NEC 406.12?

• Only in children's bedrooms
• Only in kitchens and bathrooms
• In all areas of dwelling units
• Only where children under 5 are likely to be present

NEC Reference: NEC 406.12

Question 24: What does a branch circuit overcurrent protective device (breaker or fuse) primarily protect?

• The loads and appliances connected to the circuit
• The branch circuit conductors from overheating
• The electrical panel from damage
• The grounding electrode system

NEC Reference: NEC 210.20

Question 25: A 100-ampere sub-panel (downstream panel) is fed from a 200-ampere main panel. What is the required feeder breaker rating at the main panel?

• 200 amperes
• 150 amperes
• 100 amperes
• No separate feeder breaker is needed

Question 26: When installing a dimmer switch, what must be verified before selecting the dimmer?

• The color of the dimmer matches the wallplate
• The dimmer is listed for the type of lamp being controlled
• The dimmer is rated for at least 120 volts
• The circuit is on a 15-ampere breaker only

Question 27: Service entrance conductors that are exposed and subject to physical damage must be protected by .............

• Electrical tape around the conductor
• Rigid metal conduit or other approved conduit methods
• A weather-resistant insulation jacket only
• No protection is needed for service conductors

NEC Reference: NEC 230.50(A)

Question 28: What is the minimum horizontal clearance required between service conductors and the edge of a window that can be opened?

• 1 foot
• 2 feet
• 3 feet
• 6 feet

NEC Reference: NEC 230.9(A)

Question 29: Two resistors of 6 ohms and 12 ohms are connected in parallel. What is their total resistance?

• 18 ohms
• 9 ohms
• 4 ohms
• 2 ohms

Question 30: What is a NEMA 3R enclosure designed to protect electrical equipment from?

• Indoor dust and moisture only
• Rain, sleet, and ice (outdoor weather)
• Hose-directed water jets
• Complete submersion in water