Welcome to your C-10 Electrical - Practice Exam 1
1.
What instrument is used to measure the insulation resistance of electrical conductors?
What instrument is used to measure the insulation resistance of electrical conductors?Deselect Answer
2.
A portable generator fails to maintain rated voltage under connected load. What should be checked first?
A portable generator fails to maintain rated voltage under connected load. What should be checked first?Deselect Answer
3.
In a 3-phase wye system, what is the line-to-line voltage when the phase-to-neutral voltage is 120 volts?
In a 3-phase wye system, what is the line-to-line voltage when the phase-to-neutral voltage is 120 volts?Deselect Answer
4.
A motor runs but its thermal overload protector trips repeatedly during operation. What is the most likely cause?
A motor runs but its thermal overload protector trips repeatedly during operation. What is the most likely cause?Deselect Answer
5.
Which best describes a demand factor in electrical estimating?
Which best describes a demand factor in electrical estimating?Deselect Answer
6.
What must be done before opening an energized electrical panel cover for maintenance work?
What must be done before opening an energized electrical panel cover for maintenance work?Deselect Answer
7.
Which conductor color identifies the grounded neutral conductor in a single-phase system?
Which conductor color identifies the grounded neutral conductor in a single-phase system?Deselect Answer
8.
What is the standard identification for an equipment grounding conductor?
What is the standard identification for an equipment grounding conductor?Deselect Answer
9.
What is the minimum trade size conduit permitted for general wiring installations?
What is the minimum trade size conduit permitted for general wiring installations?Deselect Answer
10.
A GFCI receptacle trips and will not reset. What is the most likely cause?
A GFCI receptacle trips and will not reset. What is the most likely cause?Deselect Answer
11.
What is the minimum size copper grounding electrode conductor for a 200-ampere service?
What is the minimum size copper grounding electrode conductor for a 200-ampere service?Deselect Answer
12.
When must PPE be used when working on or near energized electrical equipment?
When must PPE be used when working on or near energized electrical equipment?Deselect Answer
13.
What is the minimum headroom required in front of electrical equipment per NEC 110.26?
What is the minimum headroom required in front of electrical equipment per NEC 110.26?Deselect Answer
14.
What is the primary hazard when working near or disconnecting electrical capacitor banks?
What is the primary hazard when working near or disconnecting electrical capacitor banks?Deselect Answer
15.
A wind turbine installation requires what type of electrical disconnect?
A wind turbine installation requires what type of electrical disconnect?Deselect Answer
16.
When troubleshooting a completely dead outlet, what is the correct diagnostic sequence?
When troubleshooting a completely dead outlet, what is the correct diagnostic sequence?Deselect Answer
17.
A PV system DC disconnect must be located where?
18.
Which grounding electrode is considered most effective and preferred when available per the NEC?
Which grounding electrode is considered most effective and preferred when available per the NEC?Deselect Answer
19.
Which document takes precedence when plans and specifications conflict on a project?
Which document takes precedence when plans and specifications conflict on a project?Deselect Answer
20.
What is required for a motor disconnect switch installed within sight of the motor?
What is required for a motor disconnect switch installed within sight of the motor?Deselect Answer
21.
When conduit passes through a fire-rated wall or floor assembly, what is required by the NEC?
When conduit passes through a fire-rated wall or floor assembly, what is required by the NEC?Deselect Answer
22.
What is the minimum clearance required between service conductors and a roof surface with less than 4 in 12 slope?
What is the minimum clearance required between service conductors and a roof surface with less than 4 in 12 slope?Deselect Answer
23.
What is the maximum spacing between kitchen countertop receptacles per NEC 210.52?
What is the maximum spacing between kitchen countertop receptacles per NEC 210.52?Deselect Answer
24.
What is the primary purpose of a load calculation in electrical system planning?
What is the primary purpose of a load calculation in electrical system planning?Deselect Answer
25.
When installing a subpanel in a detached structure, the neutral and ground buses must be:
When installing a subpanel in a detached structure, the neutral and ground buses must be:Deselect Answer
26.
An ohmmeter reading of zero ohms between a hot conductor and the equipment ground indicates what condition?
An ohmmeter reading of zero ohms between a hot conductor and the equipment ground indicates what condition?Deselect Answer
27.
What must be verified before energizing a newly installed electrical panelboard?
What must be verified before energizing a newly installed electrical panelboard?Deselect Answer
28.
What is the correct immediate action when a co-worker is receiving an electric shock and remains in contact with an energized source?
What is the correct immediate action when a co-worker is receiving an electric shock and remains in contact with an energized source?Deselect Answer
29.
When selecting a dimmer switch for installation, what must be verified?
When selecting a dimmer switch for installation, what must be verified?Deselect Answer
30.
A circuit is confirmed to be overloaded but the circuit breaker does not trip. What is the most likely explanation?
A circuit is confirmed to be overloaded but the circuit breaker does not trip. What is the most likely explanation?Deselect Answer
31.
When calculating voltage drop, which factor does NOT affect the calculation?
When calculating voltage drop, which factor does NOT affect the calculation?Deselect Answer
32.
What is the minimum size equipment grounding conductor required for a 20-ampere branch circuit?
What is the minimum size equipment grounding conductor required for a 20-ampere branch circuit?Deselect Answer
33.
What is the primary purpose of lockout/tagout (LOTO) procedures in electrical construction?
What is the primary purpose of lockout/tagout (LOTO) procedures in electrical construction?Deselect Answer
34.
When is liquidtight flexible metal conduit LFMC required rather than standard FMC?
When is liquidtight flexible metal conduit LFMC required rather than standard FMC?Deselect Answer
35.
What unit is used to measure residential battery storage system capacity?
What unit is used to measure residential battery storage system capacity?Deselect Answer
36.
When sizing a generator for residential backup power, what load factor is typically applied?
When sizing a generator for residential backup power, what load factor is typically applied?Deselect Answer
37.
What percentage overage is typically added to conduit material estimates to account for waste and fittings?
What percentage overage is typically added to conduit material estimates to account for waste and fittings?Deselect Answer
38.
When a white conductor is used as an ungrounded hot conductor, how must it be identified?
When a white conductor is used as an ungrounded hot conductor, how must it be identified?Deselect Answer
39.
An AFCI breaker trips repeatedly on a circuit with no visually apparent wiring damage. What should be checked first?
An AFCI breaker trips repeatedly on a circuit with no visually apparent wiring damage. What should be checked first?Deselect Answer
40.
A single-phase 240-volt motor draws 18 amperes full load. What is the minimum branch circuit breaker size per the NEC?
A single-phase 240-volt motor draws 18 amperes full load. What is the minimum branch circuit breaker size per the NEC?Deselect Answer
41.
What is the primary benefit of correcting power factor with capacitor banks?
What is the primary benefit of correcting power factor with capacitor banks?Deselect Answer
42.
What minimum clearance must exist from the top of electrical equipment to the ceiling above it?
What minimum clearance must exist from the top of electrical equipment to the ceiling above it?Deselect Answer
43.
What is the minimum box fill volume required per 12 AWG conductor per NEC Table 314.16(B)?
What is the minimum box fill volume required per 12 AWG conductor per NEC Table 314.16(B)?Deselect Answer
44.
What is the primary purpose of a bonding jumper in an electrical system?
What is the primary purpose of a bonding jumper in an electrical system?Deselect Answer
45.
What is the minimum service entrance conductor size for a 200-ampere residential service?
What is the minimum service entrance conductor size for a 200-ampere residential service?Deselect Answer
46.
What NEMA receptacle configuration is the current standard for new residential 240-volt 30-ampere dryer installations?
What NEMA receptacle configuration is the current standard for new residential 240-volt 30-ampere dryer installations?Deselect Answer
47.
What torque specification must be followed when terminating conductors at circuit breakers?
What torque specification must be followed when terminating conductors at circuit breakers?Deselect Answer
48.
What is the ampacity of a 12 AWG copper conductor with 60-degree C insulation rating in a dry location?
What is the ampacity of a 12 AWG copper conductor with 60-degree C insulation rating in a dry location?Deselect Answer
49.
What is the minimum working clearance required in front of a 120/240-volt residential panelboard?
What is the minimum working clearance required in front of a 120/240-volt residential panelboard?Deselect Answer
50.
A circuit breaker trips immediately when reset. What is the most likely cause?
A circuit breaker trips immediately when reset. What is the most likely cause?Deselect Answer
51.
What Cal/OSHA requirement applies to electrical workers who need to operate powder-actuated fastening tools on a job site?
What Cal/OSHA requirement applies to electrical workers who need to operate powder-actuated fastening tools on a job site?Deselect Answer
52.
Which NEC article specifically governs photovoltaic system installations?
Which NEC article specifically governs photovoltaic system installations?Deselect Answer
53.
What is required when installing a ceiling fan where a standard light fixture previously existed?
What is required when installing a ceiling fan where a standard light fixture previously existed?Deselect Answer
54.
What does the arc flash protection boundary define in NFPA 70E?
What does the arc flash protection boundary define in NFPA 70E?Deselect Answer
55.
When commissioning a new photovoltaic system, what must be verified first before connecting strings to the inverter?
When commissioning a new photovoltaic system, what must be verified first before connecting strings to the inverter?Deselect Answer
56.
What is the most common electrical cause of flickering or dimming lights throughout a residence?
What is the most common electrical cause of flickering or dimming lights throughout a residence?Deselect Answer
57.
What is the maximum total degrees of bends permitted in a conduit run between pull points?
What is the maximum total degrees of bends permitted in a conduit run between pull points?Deselect Answer
58.
What PPE is required when working on energized equipment with a confirmed arc flash hazard?
What PPE is required when working on energized equipment with a confirmed arc flash hazard?Deselect Answer
59.
What Cal/OSHA requirement applies when electrical work is performed in buildings containing asbestos-containing materials?
What Cal/OSHA requirement applies when electrical work is performed in buildings containing asbestos-containing materials?Deselect Answer
60.
What is the minimum approach distance that unqualified workers must maintain from overhead power lines carrying up to 50kV?
What is the minimum approach distance that unqualified workers must maintain from overhead power lines carrying up to 50kV?Deselect Answer
61.
A disconnect for a permanently connected electric appliance over 300 VA must be located where?
A disconnect for a permanently connected electric appliance over 300 VA must be located where?Deselect Answer
62.
When completing finish wiring on a grid-tied PV inverter, what labeling does the NEC require?
When completing finish wiring on a grid-tied PV inverter, what labeling does the NEC require?Deselect Answer
63.
Which NEC article covers general requirements for wiring methods and materials?
Which NEC article covers general requirements for wiring methods and materials?Deselect Answer
64.
Which fire extinguisher class is specifically rated and safe for use on energized electrical equipment fires?
Which fire extinguisher class is specifically rated and safe for use on energized electrical equipment fires?Deselect Answer
65.
GFCI protection is required in which of the following locations in a dwelling unit?
GFCI protection is required in which of the following locations in a dwelling unit?Deselect Answer
66.
What is the primary advantage of a clamp-on ammeter when troubleshooting electrical circuits?
What is the primary advantage of a clamp-on ammeter when troubleshooting electrical circuits?Deselect Answer
67.
What is the maximum support spacing for service entrance cable SE cable on a building exterior?
What is the maximum support spacing for service entrance cable SE cable on a building exterior?Deselect Answer
68.
What is the maximum number of current-carrying conductors allowed in a conduit before ampacity derating is required?
What is the maximum number of current-carrying conductors allowed in a conduit before ampacity derating is required?Deselect Answer
69.
What color identifies the high-leg conductor in a 3-phase 4-wire delta service?
What color identifies the high-leg conductor in a 3-phase 4-wire delta service?Deselect Answer
70.
What is the correct procedure for testing a GFCI receptacle to verify it is functioning properly?
What is the correct procedure for testing a GFCI receptacle to verify it is functioning properly?Deselect Answer
71.
What hazardous gas produced by lead-acid batteries during charging creates an explosion risk?
What hazardous gas produced by lead-acid batteries during charging creates an explosion risk?Deselect Answer
72.
For which electrical service configuration is ground fault protection of equipment GFPE required by the NEC?
For which electrical service configuration is ground fault protection of equipment GFPE required by the NEC?Deselect Answer
73.
Before energizing a new electrical installation, what is the first step a qualified electrician should perform?
Before energizing a new electrical installation, what is the first step a qualified electrician should perform?Deselect Answer
74.
What is the proper listed method for sealing conduit entries into an electrical enclosure in a wet location?
What is the proper listed method for sealing conduit entries into an electrical enclosure in a wet location?Deselect Answer
75.
AFCI protection is required for which circuits in a dwelling unit per current NEC?
AFCI protection is required for which circuits in a dwelling unit per current NEC?Deselect Answer
76.
When interpreting electrical plans, what does the symbol WP indicate?
When interpreting electrical plans, what does the symbol WP indicate?Deselect Answer
77.
What is required before a worker enters a permit-required confined space for electrical work?
What is required before a worker enters a permit-required confined space for electrical work?Deselect Answer
78.
Which of the following is a required element of electrical plans for a commercial project?
Which of the following is a required element of electrical plans for a commercial project?Deselect Answer
79.
A 20-ampere 120-volt branch circuit supplies a continuous load. What is the maximum load allowed?
A 20-ampere 120-volt branch circuit supplies a continuous load. What is the maximum load allowed?Deselect Answer
80.
What is the maximum length permitted for flexible metal conduit used as a luminaire whip in a suspended ceiling?
What is the maximum length permitted for flexible metal conduit used as a luminaire whip in a suspended ceiling?Deselect Answer
81.
What is the maximum voltage drop recommended by the NEC for branch circuits?
What is the maximum voltage drop recommended by the NEC for branch circuits?Deselect Answer
82.
What hazardous substance contained in fluorescent lamps requires specialized handling during lamp disposal?
What hazardous substance contained in fluorescent lamps requires specialized handling during lamp disposal?Deselect Answer
83.
Which wire connector type is NOT permitted for use in a wet location?
Which wire connector type is NOT permitted for use in a wet location?Deselect Answer
84.
What is the leading cause of electrical fatalities in the construction industry?
What is the leading cause of electrical fatalities in the construction industry?Deselect Answer
85.
What conduit type is required when embedded in a concrete slab on grade?
What conduit type is required when embedded in a concrete slab on grade?Deselect Answer
86.
What is the correct tool to use to verify a circuit is de-energized before touching conductors?
What is the correct tool to use to verify a circuit is de-energized before touching conductors?Deselect Answer
87.
When a white conductor is repurposed as an ungrounded hot conductor, how must it be identified at finish?
When a white conductor is repurposed as an ungrounded hot conductor, how must it be identified at finish?Deselect Answer
88.
What is the maximum horizontal support spacing for EMT conduit?
What is the maximum horizontal support spacing for EMT conduit?Deselect Answer
89.
What is the purpose of safety data sheet SDS training for workers on electrical construction job sites?
What is the purpose of safety data sheet SDS training for workers on electrical construction job sites?Deselect Answer
90.
What is the standard voltage for residential general lighting branch circuits in California?
What is the standard voltage for residential general lighting branch circuits in California?Deselect Answer
91.
What is the correct formula for calculating electrical power?
What is the correct formula for calculating electrical power?Deselect Answer
92.
What is the minimum burial depth for rigid metal conduit installed under a residential driveway?
What is the minimum burial depth for rigid metal conduit installed under a residential driveway?Deselect Answer
93.
What is the maximum support spacing for nonmetallic sheathed cable NM-B?
What is the maximum support spacing for nonmetallic sheathed cable NM-B?Deselect Answer
94.
What is the minimum burial depth for conductors installed in Schedule 40 PVC conduit under residential property not subject to vehicle traffic?
What is the minimum burial depth for conductors installed in Schedule 40 PVC conduit under residential property not subject to vehicle traffic?Deselect Answer
95.
When a wire splice is made inside a device box, what is required per the NEC?
When a wire splice is made inside a device box, what is required per the NEC?Deselect Answer
96.
In MasterFormat construction specifications, which division covers electrical systems?
In MasterFormat construction specifications, which division covers electrical systems?Deselect Answer
97.
What does Cal/OSHA require for worker protection in trenches deeper than 5 feet that workers must enter?
What does Cal/OSHA require for worker protection in trenches deeper than 5 feet that workers must enter?Deselect Answer
98.
A contractor installs a 240-volt 30-ampere circuit for a clothes dryer. What is the minimum copper conductor size required?
A contractor installs a 240-volt 30-ampere circuit for a clothes dryer. What is the minimum copper conductor size required?Deselect Answer
99.
What does the abbreviation AIC stand for in electrical work?
What does the abbreviation AIC stand for in electrical work?Deselect Answer
100.
When PV system DC conductors are run inside a building, what protection is required?
When PV system DC conductors are run inside a building, what protection is required?Deselect Answer
101.
What instrument is required to verify the correct rotation direction of a 3-phase motor before startup?
What instrument is required to verify the correct rotation direction of a 3-phase motor before startup?Deselect Answer
