C-10 Electrical – Practice Exam 2

Welcome to your C-10 Electrical - Practice Exam 2

When using a portable electric drill on a construction site, what safety feature is required by Cal/OSHA?

When using a portable electric drill on a construction site, what safety feature is required by Cal/OSHA?Deselect Answer

The drill must be double-insulated or have a three-wire grounded cord

The drill must be battery-powered only

A GFCI must be installed only if the drill is used outdoors

No special requirements for drills under 10 amperes

None

What is the ampacity of a 10 AWG copper conductor with 75-degree C insulation in a dry location?

What is the ampacity of a 10 AWG copper conductor with 75-degree C insulation in a dry location?Deselect Answer

30 amperes

35 amperes

40 amperes

50 amperes

None

A 3-phase motor draws significantly higher current on one phase than the other two. What is the most likely cause?

A 3-phase motor draws significantly higher current on one phase than the other two. What is the most likely cause?Deselect Answer

The motor is running normally — phase currents are always unequal

Phase voltage unbalance, a failing winding, or a developing single-phase condition

The clamp-on ammeter is inaccurate on that phase

The motor needs to run longer to equalize the phases

None

After installing a new generator with an automatic transfer switch, how should the system be tested?

After installing a new generator with an automatic transfer switch, how should the system be tested?Deselect Answer

Start the generator and immediately transfer the load

Simulate a power outage by opening the main breaker, verify the ATS transfers the load within specified time, confirm stable operation, then restore utility power and verify retransfer

Run the generator unloaded for 24 hours first

Only the utility company can test automatic transfer switches

None

After installing a new 3-phase motor, it runs but rotates in the wrong direction. What is the simplest correction?

After installing a new 3-phase motor, it runs but rotates in the wrong direction. What is the simplest correction?Deselect Answer

Replace the motor with one wired for the opposite rotation

Swap any two of the three phase conductors at the motor terminals

Reverse the ground and neutral connections

Adjust the motor's internal wiring by reversing all three phase leads

None

What is the minimum bending radius for a 1-inch EMT conduit?

What is the minimum bending radius for a 1-inch EMT conduit?Deselect Answer

4 inches inside radius

4.5 inches inside radius

5 inches inside radius

6 inches inside radius

None

What does the term 'qualified person' mean in the context of electrical safety?

What does the term 'qualified person' mean in the context of electrical safety?Deselect Answer

Any licensed electrician regardless of training on the specific equipment

A person who has received training and demonstrated skills to avoid electrical hazards when working on or near energized equipment

Any person who has completed an OSHA 10-hour safety course

Any person over 18 years of age working on electrical systems

None

What is the minimum insulation resistance required for a conductor to be considered safe for energizing per IEEE standards?

What is the minimum insulation resistance required for a conductor to be considered safe for energizing per IEEE standards?Deselect Answer

1 ohm per volt of operating voltage

1 megohm minimum — higher is better

100 kilohms minimum

No minimum standard exists

None

What is the minimum arc flash PPE category required for work on energized 480-volt switchgear with the door open?

What is the minimum arc flash PPE category required for work on energized 480-volt switchgear with the door open?Deselect Answer

No PPE required for 480 volts

Depends on the incident energy analysis — minimum Category 1 (4 cal per cm2) if analysis confirms that level

Category 4 (40 cal per cm2) is always required at 480 volts

Only rubber gloves are required at 480 volts

None

10.

What does a reading of infinite resistance (OL) between a motor winding and ground indicate?

What does a reading of infinite resistance (OL) between a motor winding and ground indicate?Deselect Answer

The motor winding has a ground fault

The motor winding insulation is intact with no fault to ground

The motor is overloaded

The megohmmeter is defective

None

11.

What is the minimum dedicated bathroom branch circuit requirement per the NEC?

What is the minimum dedicated bathroom branch circuit requirement per the NEC?Deselect Answer

A shared 15-ampere circuit is acceptable

At least one 20-ampere circuit dedicated to bathroom receptacle outlets

Two 20-ampere circuits per bathroom

A 15-ampere circuit shared with bedroom outlets

None

12.

What is the purpose of an equipment grounding conductor in terms of worker safety?

What is the purpose of an equipment grounding conductor in terms of worker safety?Deselect Answer

To reduce voltage drop in branch circuits

To provide a low-impedance fault path that operates the overcurrent device and limits the voltage on metal enclosures to safe levels during a fault

To improve power quality by reducing harmonics

To provide a return path for normal operating current

None

13.

When trimming out a 3-phase panelboard, what must be verified before energizing the main breaker?

When trimming out a 3-phase panelboard, what must be verified before energizing the main breaker?Deselect Answer

That all breakers are in the off position and all conductors are terminated and torqued correctly

That all breakers are in the on position to test for faults

That the neutral bar is disconnected from the enclosure

That only Phase A circuits are connected first

None

14.

What must a contractor do when an employee is injured on a job site in California?

What must a contractor do when an employee is injured on a job site in California?Deselect Answer

Only report injuries that require hospitalization

Provide first aid, call 911 if needed, preserve the scene, and report the injury to Cal/OSHA within 8 hours for serious injuries or fatalities

Report the injury only to the general contractor within 24 hours

Complete an incident report within 30 days of the injury

None

15.

What is the required response when an electrical worker discovers an unlabeled energized conductor during a remodel?

What is the required response when an electrical worker discovers an unlabeled energized conductor during a remodel?Deselect Answer

Touch the conductor briefly to verify it is energized

Treat the conductor as energized and use LOTO procedures — do not assume it is de-energized

Cut the conductor and check if anything loses power

Assume it is a dead conductor from a previous installation

None

16.

When is a surge protective device (SPD) required by the NEC for a dwelling unit service?

When is a surge protective device (SPD) required by the NEC for a dwelling unit service?Deselect Answer

Only in coastal areas subject to lightning

For all new dwelling unit services as of the 2020 NEC

Only when the homeowner requests one

Only for services above 200 amperes

None

17.

What is required at each end of a conduit run that terminates in a wet location enclosure?

What is required at each end of a conduit run that terminates in a wet location enclosure?Deselect Answer

Standard locknuts only

Listed conduit hubs or sealing fittings to prevent water entry

PVC cement applied around the conduit entry

No special fitting is required at terminations

None

18.

What is required when installing a bathroom exhaust fan with a heating element on a branch circuit?

What is required when installing a bathroom exhaust fan with a heating element on a branch circuit?Deselect Answer

It may share any existing 15-ampere circuit

It must be on a circuit that can handle the combined motor and heating load — typically a dedicated 20-ampere circuit

It must be on the same circuit as the bathroom lighting

It must be on a GFCI-protected 30-ampere circuit

None

19.

A PV system produces 8 kilowatts at 240 volts. What is the approximate full-load current output?

A PV system produces 8 kilowatts at 240 volts. What is the approximate full-load current output?Deselect Answer

20 amperes

33 amperes

40 amperes

48 amperes

None

20.

After replacing a circuit breaker, how should its operation be verified?

After replacing a circuit breaker, how should its operation be verified?Deselect Answer

The breaker is considered verified when it is installed

Apply a calibrated test load, verify the breaker does not trip under rated load, and verify it trips within the required time when overloaded using a breaker tester or manufacturer trip curve data

Reset the breaker three times to verify mechanical operation

Visual inspection of the breaker handle position is sufficient verification

None

21.

What is the maximum distance allowed between receptacles along a wall in a residential living room?

What is the maximum distance allowed between receptacles along a wall in a residential living room?Deselect Answer

6 feet

10 feet

12 feet

No distance requirement in living rooms

None

22.

What is the minimum size aluminum conductor permitted for a 200-ampere residential service entrance?

What is the minimum size aluminum conductor permitted for a 200-ampere residential service entrance?Deselect Answer

2/0 AWG aluminum

3/0 AWG aluminum

4/0 AWG aluminum

350 kcmil aluminum

None

23.

What is the standard demand factor applied to the first 3000 VA of residential general lighting load?

What is the standard demand factor applied to the first 3000 VA of residential general lighting load?Deselect Answer

50 percent

75 percent

100 percent

125 percent

None

24.

What is the purpose of a job hazard analysis (JHA) before beginning electrical work?

What is the purpose of a job hazard analysis (JHA) before beginning electrical work?Deselect Answer

To estimate the project cost and material quantities

To identify potential hazards for each task, determine control measures, and communicate risks to workers before work begins

To document which tools will be needed for the job

To satisfy union contract documentation requirements only

None

25.

What NEC article governs the installation of underground feeder cable (Type UF)?

What NEC article governs the installation of underground feeder cable (Type UF)?Deselect Answer

Article 310

Article 334

Article 340

Article 350

None

26.

What is the purpose of a hipot (high potential) test on new cable installations?

What is the purpose of a hipot (high potential) test on new cable installations?Deselect Answer

To measure the conductor resistance of the cable

To stress-test the insulation by applying elevated voltage to detect manufacturing defects or installation damage before energizing

To determine the capacitance of the cable for charging current calculations

To verify correct phase sequence of the conductors

None

27.

When installing conduit through wood framing members, what protection is required for conductors?

When installing conduit through wood framing members, what protection is required for conductors?Deselect Answer

No protection is required if conduit is used

Steel nail plates at least 1/16 inch thick must protect conductors within 1.25 inches of the framing surface

Only fiberglass insulation wrap is required

Red painted markings on the framing are sufficient

None

28.

When installing a service entrance, what is the minimum height of the service point above grade at the meter?

When installing a service entrance, what is the minimum height of the service point above grade at the meter?Deselect Answer

4 feet

5 feet

6 feet

10 feet

None

29.

What warning sign must be posted on electrical rooms and equipment rooms containing exposed energized conductors?

What warning sign must be posted on electrical rooms and equipment rooms containing exposed energized conductors?Deselect Answer

No Trespassing

Danger — High Voltage — Keep Out or equivalent warning per NFPA 70E and NEC 110.27

Authorized Personnel Only

Electrical Room — No Food or Drink

None

30.

What is the maximum ampere rating for a receptacle installed on a 20-ampere branch circuit?

What is the maximum ampere rating for a receptacle installed on a 20-ampere branch circuit?Deselect Answer

15 amperes

20 amperes

25 amperes

Either 15 or 20 amperes

None

31.

What does a high megohmmeter reading (above 100 megohms) on a motor winding indicate?

What does a high megohmmeter reading (above 100 megohms) on a motor winding indicate?Deselect Answer

The motor winding has a significant ground fault

The motor insulation is in good condition with no signs of deterioration

The motor is overloaded and overheating

The megohmmeter test voltage is set too low

None

32.

What Cal/OSHA regulation covers electrical safety for general industry workers in California?

What Cal/OSHA regulation covers electrical safety for general industry workers in California?Deselect Answer

Title 8, Section 1500

Title 8, Subchapter 5 (Electrical Safety Orders)

Title 24, Part 3

Title 19, Fire Safety Regulations

None

33.

A wind generator is rated at 10 kW at 48 VDC. What is the rated output current?

A wind generator is rated at 10 kW at 48 VDC. What is the rated output current?Deselect Answer

125 amperes

175 amperes

208 amperes

480 amperes

None

34.

When sizing conductors for a feeder supplying multiple branch circuits, what percentage of continuous loads must be added?

When sizing conductors for a feeder supplying multiple branch circuits, what percentage of continuous loads must be added?Deselect Answer

10 percent

15 percent

25 percent

125 percent of continuous plus 100 percent of non-continuous

None

35.

What is the purpose of an electrical load schedule on commercial plans?

What is the purpose of an electrical load schedule on commercial plans?Deselect Answer

To list the names of all electrical workers on the project

To itemize each piece of electrical equipment with its voltage, phase, amperage, and circuit number

To specify the paint color for all electrical panels

To document the project completion schedule

None

36.

What NEC section requires a laundry branch circuit in a residential dwelling?

What NEC section requires a laundry branch circuit in a residential dwelling?Deselect Answer

NEC 210.11(C)(1)

NEC 210.11(C)(2)

NEC 210.52(F)

NEC 230.79

None

37.

When estimating labor for conduit installation, which factor most significantly affects productivity?

When estimating labor for conduit installation, which factor most significantly affects productivity?Deselect Answer

The color of the conduit

The type and size of conduit, number of bends, and height of installation

The brand of wire pull lubricant used

The day of the week the work is performed

None

38.

What voltage reading between hot and neutral at a receptacle indicates a high-resistance neutral connection?

What voltage reading between hot and neutral at a receptacle indicates a high-resistance neutral connection?Deselect Answer

120 volts — normal

Between 60 and 110 volts with a load connected, or rising above 120 volts on the opposite leg

0 volts indicating an open circuit

240 volts indicating a phase-to-phase short

None

39.

What is required when splicing conductors larger than 4 AWG in a junction box?

What is required when splicing conductors larger than 4 AWG in a junction box?Deselect Answer

Twist-on wire connectors are acceptable for all sizes

Listed mechanical connectors or compression connectors rated for the conductor size must be used

Only soldered connections are permitted for large conductors

Large conductors cannot be spliced — they must run continuously

None

40.

What color is used to identify a phase B conductor in a 3-phase system using the standard color code?

What color is used to identify a phase B conductor in a 3-phase system using the standard color code?Deselect Answer

Black

Red

Blue

Orange

None

41.

When installing a 3-phase panelboard, how must the panel be oriented to maintain proper phase sequence?

When installing a 3-phase panelboard, how must the panel be oriented to maintain proper phase sequence?Deselect Answer

Any orientation is acceptable

Phase A at top, B in middle, C at bottom on single-column panels

According to the manufacturer instructions for correct phase sequence connection

Phase sequence only matters at the service entrance, not at subpanels

None

42.

What is the purpose of a panelboard schedule on electrical drawings?

What is the purpose of a panelboard schedule on electrical drawings?Deselect Answer

To list the installation crew assignments

To document each circuit breaker size, circuit load, and wire size for every circuit in the panel

To specify the finish color of the panelboard enclosure

To record the panel inspection history

None

43.

When installing a three-way switch, which terminal is the common terminal?

When installing a three-way switch, which terminal is the common terminal?Deselect Answer

The terminal with the green screw

The terminal with the black or darker colored screw

Either of the two traveler terminals

The terminal with the silver screw

None

44.

A new circuit tests as dead at the outlet but the breaker is not tripped. What is the most likely cause?

A new circuit tests as dead at the outlet but the breaker is not tripped. What is the most likely cause?Deselect Answer

The breaker is too large for the circuit

An open connection exists somewhere between the panel and the outlet

The utility has disconnected service

The outlet is the wrong voltage rating

None

45.

What is the purpose of short circuit current rating (SCCR) on electrical equipment?

What is the purpose of short circuit current rating (SCCR) on electrical equipment?Deselect Answer

To indicate the equipment operating voltage

To indicate the maximum fault current the equipment can withstand without damage or hazard

To specify the normal operating current of the equipment

To indicate the insulation resistance rating

None

46.

What is the correct procedure when a multimeter reads OL (overload) when measuring resistance?

What is the correct procedure when a multimeter reads OL (overload) when measuring resistance?Deselect Answer

The meter is broken and must be replaced

The resistance is too high for the selected range — switch to a higher range, or the circuit has an open

The circuit has a short circuit

The battery in the meter is dead

None

47.

When is a disconnecting means required to be within sight of HVAC equipment?

When is a disconnecting means required to be within sight of HVAC equipment?Deselect Answer

Only when the equipment is over 3 horsepower

Always — within 50 feet and in sight of the equipment

Only for equipment over 240 volts

Only for three-phase equipment

None

48.

What is the minimum cover required for Schedule 80 PVC conduit installed under a public street?

What is the minimum cover required for Schedule 80 PVC conduit installed under a public street?Deselect Answer

12 inches

18 inches

24 inches

36 inches

None

49.

What is the required frequency of electrical safety training for workers exposed to electrical hazards per NFPA 70E?

What is the required frequency of electrical safety training for workers exposed to electrical hazards per NFPA 70E?Deselect Answer

Once at initial hire only

At initial assignment and when changes occur that affect the safety of the worker — at intervals not to exceed 3 years

Monthly safety meetings are sufficient

Annual training regardless of hazard changes

None

50.

What is the recommended maintenance interval for inspecting and retorquing electrical connections in industrial panels?

What is the recommended maintenance interval for inspecting and retorquing electrical connections in industrial panels?Deselect Answer

Every 10 years

Annually or per manufacturer recommendations — connections loosen due to thermal cycling

Never — connections properly made do not loosen

Only when a problem is observed

None

51.

When using nonmetallic sheathed cable (NM-B) in an attic accessible by a permanent ladder, how must the cable be protected?

When using nonmetallic sheathed cable (NM-B) in an attic accessible by a permanent ladder, how must the cable be protected?Deselect Answer

No protection required in attics

Cable must be protected within 6 feet of the attic access opening by guard strips or conduit

Cable must be run in conduit throughout the entire attic

Cable must be stapled to the bottom of joists only

None

52.

What is the maximum number of disconnects permitted to serve as the service disconnecting means for a single building?

What is the maximum number of disconnects permitted to serve as the service disconnecting means for a single building?Deselect Answer

No limit if properly labeled

None

53.

What type of raceway system is required in a Class I, Division 1 hazardous location?

What type of raceway system is required in a Class I, Division 1 hazardous location?Deselect Answer

EMT with standard fittings

PVC conduit with expansion fittings

Rigid metal conduit with explosionproof fittings

Cable tray system

None

54.

What does Cal/OSHA require regarding the use of damaged or defective hand tools on a job site?

What does Cal/OSHA require regarding the use of damaged or defective hand tools on a job site?Deselect Answer

Damaged tools may be used if the damage is minor

Damaged or defective tools must be removed from service immediately and tagged or disabled to prevent use

Only supervisors may determine if a damaged tool can be used safely

Tools may continue to be used until the end of the shift and then replaced

None

55.

What is the maximum weight a standard outlet box can support for a ceiling-mounted luminaire?

What is the maximum weight a standard outlet box can support for a ceiling-mounted luminaire?Deselect Answer

25 pounds

35 pounds

50 pounds

75 pounds

None

56.

What is the purpose of an expansion fitting in a PVC conduit installation?

What is the purpose of an expansion fitting in a PVC conduit installation?Deselect Answer

To allow for the thermal expansion and contraction of PVC conduit due to temperature changes

To increase the wire fill capacity of the conduit

To connect PVC conduit to metal conduit

To provide a weatherproof seal at building entries

None

57.

How must a panelboard be identified when installed in a building?

How must a panelboard be identified when installed in a building?Deselect Answer

No identification is required for residential panels

Each circuit must be legibly identified as to its purpose or use on a circuit directory

The panel must be painted red for visibility

The panel must be identified only at the main breaker

None

58.

What type of enclosure is required for electrical equipment installed in a wet location?

What type of enclosure is required for electrical equipment installed in a wet location?Deselect Answer

NEMA Type 1 (general purpose indoor)

NEMA Type 3R or 4 (raintight or watertight)

NEMA Type 2 (drip-proof indoor)

Any metal enclosure with a cover

None

59.

Which of the following correctly describes an equipment grounding conductor (EGC)?

Which of the following correctly describes an equipment grounding conductor (EGC)?Deselect Answer

The conductor that carries normal load current back to the source

A conductor that provides a fault current path from equipment to the source to operate overcurrent devices

The conductor bonded to the neutral at the main panel only

A conductor used exclusively for lightning protection

None

60.

What is the maximum overcurrent protection permitted for a 12 AWG copper branch circuit conductor?

What is the maximum overcurrent protection permitted for a 12 AWG copper branch circuit conductor?Deselect Answer

15 amperes

20 amperes

25 amperes

30 amperes

None

61.

What does kVA stand for and how does it relate to kW?

What does kVA stand for and how does it relate to kW?Deselect Answer

Kilovolt-amperes; equals kW when power factor is 1.0

Kilovolt-amperes; always equals kW regardless of load type

Kilovoltage-amps; always less than kW

Kilovolt-amperes; always greater than kW by 25 percent

None

62.

What is the minimum approach distance for a qualified worker to an exposed energized conductor at 480 volts?

What is the minimum approach distance for a qualified worker to an exposed energized conductor at 480 volts?Deselect Answer

No restriction for qualified workers at 480 volts

Per the restricted approach boundary defined in NFPA 70E Table 130.4(D)(a)

3 feet at all voltages below 600 volts

6 feet regardless of voltage class

None

63.

Which instrument is used to measure the resistance of a grounding electrode system?

Which instrument is used to measure the resistance of a grounding electrode system?Deselect Answer

Clamp-on ammeter

Megohmmeter

Earth ground resistance tester

Non-contact voltage tester

None

64.

What is the proper installation method for a dishwasher electrical connection?

What is the proper installation method for a dishwasher electrical connection?Deselect Answer

Direct wire to a dedicated 15-ampere circuit

Cord and plug connection or direct wire to a dedicated 20-ampere circuit

Connection to the kitchen small appliance circuit

Connection to the garbage disposal circuit using a junction box

None

65.

What is the purpose of a one-line diagram in electrical planning?

What is the purpose of a one-line diagram in electrical planning?Deselect Answer

To show the physical location of all devices

To show the overall system configuration, service size, panel ratings, and protective devices in simplified form

To detail the wire colors used throughout the system

To show the floor plan layout of all receptacles

None

66.

What is the minimum number of small appliance branch circuits required in a residential kitchen?

What is the minimum number of small appliance branch circuits required in a residential kitchen?Deselect Answer

One 20-ampere circuit

Two 20-ampere circuits

Three 20-ampere circuits

One 15-ampere and one 20-ampere circuit

None

67.

What NEC article covers branch circuit requirements for dwelling units?

What NEC article covers branch circuit requirements for dwelling units?Deselect Answer

Article 200

Article 210

Article 215

Article 220

None

68.

When commissioning a PV battery storage system, what must be verified regarding the state of charge?

When commissioning a PV battery storage system, what must be verified regarding the state of charge?Deselect Answer

The battery must be fully discharged before first use

The battery must be at the manufacturer's recommended initial state of charge, and the battery management system must be communicating correctly with the inverter

Battery state of charge does not need to be verified at commissioning

The battery must be fully charged to 100% before connecting to the inverter

None

69.

What is the purpose of a conduit body (LB, LL, LR, T fitting) in a conduit system?

What is the purpose of a conduit body (LB, LL, LR, T fitting) in a conduit system?Deselect Answer

To reduce the conduit size between runs

To provide access for pulling wire and making direction changes in conduit systems

To provide a weatherproof seal at outdoor terminations

To connect conduit to junction boxes only

None

70.

What is the primary purpose of arc flash labeling on electrical equipment?

What is the primary purpose of arc flash labeling on electrical equipment?Deselect Answer

To satisfy a documentation requirement only

To warn workers of the arc flash hazard level so they can select appropriate PPE before opening the equipment

To identify the equipment manufacturer and model number

To indicate when the equipment was last inspected

None

71.

What is required when an electrical contractor discovers asbestos-containing pipe insulation in a ceiling space during rough wiring?

What is required when an electrical contractor discovers asbestos-containing pipe insulation in a ceiling space during rough wiring?Deselect Answer

Continue working and avoid disturbing the asbestos

Stop work immediately, prevent access to the area, notify the general contractor and building owner, and comply with Cal/OSHA asbestos requirements before resuming

Wet down the asbestos and continue working with respiratory protection only

Remove the asbestos pipe insulation to complete the electrical work

None

72.

A 240-volt single-phase load draws 15 amperes continuously. What minimum circuit breaker size is required?

A 240-volt single-phase load draws 15 amperes continuously. What minimum circuit breaker size is required?Deselect Answer

15 ampere

20 ampere

25 ampere

30 ampere

None

73.

What type of electrical plan drawing shows the routing of conduit and cable through a building structure?

What type of electrical plan drawing shows the routing of conduit and cable through a building structure?Deselect Answer

Elevation drawing

Riser diagram

Wiring diagram

Site plan

None

74.

What is the minimum working clearance required for a 480-volt panel with live parts on one side?

What is the minimum working clearance required for a 480-volt panel with live parts on one side?Deselect Answer

2.5 feet

3 feet

3.5 feet

4 feet

None

75.

When calculating the service size for a new home, which loads are included in the calculation?

When calculating the service size for a new home, which loads are included in the calculation?Deselect Answer

General lighting only

General lighting, small appliance circuits, laundry, and all fixed appliances

Kitchen appliances only

Only 240-volt loads

None

76.

In a battery energy storage system (BESS), what does the C-rate indicate?

In a battery energy storage system (BESS), what does the C-rate indicate?Deselect Answer

The carbon content of the battery chemistry

The rate at which a battery is charged or discharged relative to its total capacity

The number of charge cycles the battery has completed

The cost per kilowatt-hour of stored energy

None

77.

When installing tamper-resistant receptacles, what feature prevents insertion of a single object into one slot?

When installing tamper-resistant receptacles, what feature prevents insertion of a single object into one slot?Deselect Answer

A spring-loaded shutter that only opens when equal pressure is applied to both slots simultaneously

A locking mechanism requiring a key

A cover plate that must be removed before use

A GFCI mechanism that prevents single-slot insertion

None

78.

What is the maximum size hole that may be drilled in a 2x4 wood stud for conduit or cable passage?

What is the maximum size hole that may be drilled in a 2x4 wood stud for conduit or cable passage?Deselect Answer

1 inch diameter

1.25 inches diameter

1.5 inches diameter

The full width of the stud

None

79.

What is the minimum clearance required between service entrance conductors and windows, doors, and walkways?

What is the minimum clearance required between service entrance conductors and windows, doors, and walkways?Deselect Answer

18 inches

3 feet

6 feet

10 feet

None

80.

What does the term 'short circuit' mean in electrical work?

What does the term 'short circuit' mean in electrical work?Deselect Answer

A circuit that is shorter than designed

An unintended low-resistance connection between two conductors causing excessive current flow

A circuit with insufficient conductor length

A circuit protected by a smaller breaker than required

None

81.

A fluorescent light fixture flickers and has a burned smell. What should be done first?

A fluorescent light fixture flickers and has a burned smell. What should be done first?Deselect Answer

Replace only the lamp tubes

De-energize the circuit and inspect for a failing ballast — the burned smell indicates overheating requiring immediate attention

Adjust the lamp holders to improve contact

Increase the circuit breaker size to provide more current

None

82.

What factor must be applied when four or more current-carrying conductors are installed in a conduit?

What factor must be applied when four or more current-carrying conductors are installed in a conduit?Deselect Answer

No derating required for four conductors

Ampacity must be derated per NEC Table 310.15(C)(1)

Conductors must be increased two sizes

The conduit must be increased one trade size

None

83.

What information must be included on a permit application for a new residential electrical service?

What information must be included on a permit application for a new residential electrical service?Deselect Answer

Paint colors and interior finish selections

Service size, number of circuits, address, contractor license number, and description of work

Soil test results and foundation specifications

Plumbing fixture count and water heater size

None

84.

When installing a 240-volt baseboard heater, what type of thermostat must be used?

When installing a 240-volt baseboard heater, what type of thermostat must be used?Deselect Answer

A standard 120-volt thermostat

A 240-volt rated two-pole thermostat

Either voltage thermostat may be used

A smart thermostat rated for low-voltage control only

None

85.

During startup testing, a circuit breaker feels warm to the touch after being energized for 30 minutes. What should be done?

During startup testing, a circuit breaker feels warm to the touch after being energized for 30 minutes. What should be done?Deselect Answer

This is normal — all breakers generate some heat

Check the ampere load on the circuit and verify terminations are properly torqued — an overloaded circuit or loose connection causes excessive heat

Replace the breaker with the next larger size

Install a fan to cool the panel

None

86.

During commissioning, a new lighting circuit's AFCI breaker trips when an LED driver is connected. What is the likely cause?

During commissioning, a new lighting circuit's AFCI breaker trips when an LED driver is connected. What is the likely cause?Deselect Answer

The LED driver is defective and must be replaced

The LED driver is producing electrical noise that mimics the arc signature detected by the AFCI

The AFCI breaker is undersized for LED loads

LED lighting is not permitted on AFCI-protected circuits

None

87.

What is the Cal/OSHA requirement for electrical workers working alone on energized equipment?

What is the Cal/OSHA requirement for electrical workers working alone on energized equipment?Deselect Answer

Working alone on energized equipment above 50 volts is prohibited without specific provisions

Working alone is always permitted for licensed electricians

A buddy system is required only for work above 480 volts

Working alone is permitted if the worker notifies their supervisor by phone

None

88.

When planning a generator installation, what device is required to prevent backfeed to the utility?

When planning a generator installation, what device is required to prevent backfeed to the utility?Deselect Answer

A ground fault circuit interrupter

A transfer switch

An arc fault circuit interrupter

A surge protective device

None

89.

When pulling wire through conduit, what is the maximum recommended pulling tension for copper conductors?

When pulling wire through conduit, what is the maximum recommended pulling tension for copper conductors?Deselect Answer

The pulling tension is unlimited for short runs

0.008 times the circular mil area of the conductor in pounds

Always less than 200 pounds regardless of conductor size

Pulling tension limits apply only to cables, not individual conductors

None

90.

What first aid action is the highest priority for an electrical shock victim who is unresponsive and not breathing?

What first aid action is the highest priority for an electrical shock victim who is unresponsive and not breathing?Deselect Answer

Pour cold water over the victim

Begin CPR immediately after ensuring the scene is safe and the victim is separated from the energy source

Apply a tourniquet to the affected limb

Move the victim to a well-ventilated area first

None

91.

What is the purpose of a weatherproof in-use cover on an outdoor receptacle?

What is the purpose of a weatherproof in-use cover on an outdoor receptacle?Deselect Answer

To prevent the receptacle from being used outdoors

To protect the receptacle from rain and weather while a plug is inserted and the cover is closed over the cord

To serve as a GFCI device

To lock the receptacle from unauthorized use

None

92.

What is required when Type NM cable is run exposed on the surface of finished walls in a garage?

What is required when Type NM cable is run exposed on the surface of finished walls in a garage?Deselect Answer

NM cable may be run exposed anywhere in a garage

NM cable must be protected from physical damage — it must be run in conduit or protected by other approved means on exposed surfaces subject to damage

NM cable must be painted to match the wall color

NM cable requires no protection below 8 feet in a garage

None

93.

What is required when installing a range hood that recirculates air rather than venting to the exterior?

What is required when installing a range hood that recirculates air rather than venting to the exterior?Deselect Answer

A dedicated 30-ampere circuit

A dedicated 20-ampere circuit or connection per manufacturer instructions — no special electrical requirement for recirculating type

A direct exterior vent is always required — recirculating hoods are not permitted

An AFCI-protected circuit regardless of the branch circuit ampere rating

None

94.

What is the maximum distance from a panelboard that EMT must be supported?

What is the maximum distance from a panelboard that EMT must be supported?Deselect Answer

3 feet

5 feet

10 feet

Within 3 feet of every box or enclosure

None

95.

A new subpanel installation shows voltage between the neutral bar and the enclosure. What is the likely cause?

A new subpanel installation shows voltage between the neutral bar and the enclosure. What is the likely cause?Deselect Answer

This is normal for a subpanel installation

The neutral is incorrectly bonded to the enclosure at the subpanel creating a current-carrying path

The grounding electrode conductor is too small

The feeder conductors are undersized

None

96.

What is the correct way to install a GFCI receptacle to protect downstream outlets on the same circuit?

What is the correct way to install a GFCI receptacle to protect downstream outlets on the same circuit?Deselect Answer

Connect all downstream outlets directly to the line terminals

Connect the source power to the LINE terminals and the downstream circuit to the LOAD terminals

Connect source power to the LOAD terminals and downstream outlets to the LINE terminals

GFCI receptacles can only protect themselves, not downstream outlets

None

97.

When labeling circuits in a residential panel at finish, what information must be included?

When labeling circuits in a residential panel at finish, what information must be included?Deselect Answer

Only the circuit number is required

A clear description of the area or equipment served that accurately reflects the connected load

Only the wire gauge and breaker size

The date of installation and installer's name

None

98.

What is the purpose of a ground fault circuit interrupter (GFCI) in terms of the current level it detects?

What is the purpose of a ground fault circuit interrupter (GFCI) in terms of the current level it detects?Deselect Answer

It detects overloads above 15 amperes

It detects current imbalance of 4 to 6 milliamperes between the hot and neutral conductors

It detects voltage spikes above 150 volts

It detects arc faults in branch circuit wiring

None

99.

What is the minimum conductor size for a 20-ampere branch circuit supplying receptacles in a commercial occupancy?

What is the minimum conductor size for a 20-ampere branch circuit supplying receptacles in a commercial occupancy?Deselect Answer

14 AWG copper

12 AWG copper

10 AWG copper

8 AWG copper

None

100.

When more than one neutral conductor is present in a panel, how must they be terminated?

When more than one neutral conductor is present in a panel, how must they be terminated?Deselect Answer

Multiple neutrals may share a single terminal if the terminal is rated for it

Each neutral conductor must have its own terminal — no sharing

Neutrals may be twisted together and landed on one terminal

Neutral conductors do not require individual terminals

None

101.

What is the maximum height above the floor for a standard wall receptacle installation?

What is the maximum height above the floor for a standard wall receptacle installation?Deselect Answer

18 inches

36 inches

48 inches

There is no maximum height per the NEC

None

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