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Quizzes > Quizzes for Business > Construction

Master Electrician Licensing Practice Test Prep

Boost Your Electrical Code Mastery and Confidence

Difficulty: Moderate
Questions: 20
Learning OutcomesStudy Material
Colorful paper art promoting a quiz on Master Electrician Licensing Practice Test

Ready to master the essentials for the master electrician exam? This dynamic Master Electrician Licensing Practice Test delivers 15 multiple-choice questions to sharpen your wiring code knowledge and safety skills. Ideal for both aspiring and seasoned electricians looking for clear guidance in exam prep. Explore detailed explanations and freely modify any question in our editor to suit your study plan. Also check out the Electrician Qualification Practice Quiz, practice your property licensing know-how with the Real Estate Licensing Practice Test, and discover more quizzes to boost your licensing readiness.

Which wire color is typically used for equipment grounding conductors per NEC?
White
Red
Green
Black
The NEC specifies green or green with yellow stripe for equipment grounding conductors. White or gray are reserved for neutrals, and black or red indicate hot conductors.
What is the designation for nonmetallic sheathed cable commonly used in residential wiring?
UF-B
THHN
AC
NM-B
NM-B stands for nonmetallic sheathed cable rated for dry locations and is the standard cable in most residential branch circuits. UF-B is underground feeder cable, THHN is individual conductor insulation, and AC is armored cable.
What is the standard size of a residential small appliance branch circuit breaker per NEC?
10 A
30 A
20 A
15 A
NEC requires kitchen small appliance branch circuits to be rated at 20 A. Fifteen-ampere circuits are insufficient, and 30 A or 10 A do not meet the code requirement.
Using Ohm's Law, what current flows through a 12 Ω resistor when 120 V is applied?
12 A
0.1 A
5 A
10 A
Ohm's Law states I = V/R. Substituting 120 V ÷ 12 Ω yields 10 A of current.
Which device is required by NEC to provide protection from ground faults in kitchen countertop receptacles?
MCB
AFCI
GFCI
Fuse
GFCIs are mandated by NEC for kitchen countertop receptacles to protect against ground faults. AFCIs protect against arc faults, while MCBs and fuses provide overcurrent protection.
For a 120 V circuit with a 10 A load over 100 ft, what minimum copper conductor size is required to keep voltage drop under 3%?
10 AWG
14 AWG
8 AWG
12 AWG
Using voltage drop = (2 à - length à - I à - R)/1000, 12 AWG (1.588 Ω/1000 ft) yields ~2.64% drop. 14 AWG would exceed 3%, and larger sizes are unnecessary.
At what number of current-carrying conductors in a single raceway must ampacity adjustment factors be applied per NEC?
6
3
5
4
NEC requires derating when more than three current-carrying conductors share a raceway. Therefore, adjustments begin at four conductors.
Which device is specifically designed to protect against arc faults in branch circuits?
AFCI
MCB
GFCI
ELCI
Arc Fault Circuit Interrupters (AFCIs) detect the signature of arcing faults and interrupt the circuit. GFCIs protect from ground faults, MCBs from overcurrent, and ELCIs from earth leakage.
Which instrument is commonly used to measure insulation resistance for troubleshooting ground faults?
Clamp meter
Digital multimeter
Megohmmeter
Oscilloscope
A megohmmeter (or "megger") applies a high DC test voltage to measure insulation resistance in megaohms, helping locate ground faults. Multimeters and clamp meters are not suited for high-resistance measurement.
What is the minimum copper conductor size for a branch circuit supplying a 30 A electric oven?
14 AWG
10 AWG
8 AWG
12 AWG
NEC requires branch-circuit conductors sized not less than the rating of the overcurrent device. A 30 A breaker demands at least #10 AWG copper.
What should be the first step when beginning troubleshooting of an electrical circuit?
Replace faulty components
De-energize the circuit
Measure current
Test for voltage
Safety first: the circuit must be de-energized and locked out before any detailed testing or component replacement. Testing without de-energizing risks injury.
Which tool is most appropriate for diagnosing a short circuit by locating excessive current flow?
Clamp meter
Vibration analyzer
Insulation tester
Digital multimeter
A clamp meter measures current without breaking the circuit and can detect unusually high currents from a short. Multimeters require series connection and are less safe for large currents.
Which symptom most likely indicates a high-resistance connection in a circuit?
Connector heating
Breaker trips immediately
Loose insulation
Circuit never energizes
High-resistance connections generate localized heating under load. Instant breaker trips indicate short circuits, and loose insulation is a safety hazard but not a symptom of resistance.
When sizing conductors for a continuous load, what percentage of the load must be added to the ampacity per NEC requirements?
80%
100%
125%
150%
NEC requires conductors serving continuous loads to be sized at 125% of the continuous load current. This ensures conductors do not overheat during prolonged operation.
Which type of cable is rated for direct burial in underground installations without additional conduit?
AC
THHN
NM-B
UF-B
UF-B is designed for direct burial and wet locations. NM-B is for dry indoor use, THHN is an individual conductor insulation, and AC is armored cable requiring conduit or proper enclosure.
A 240 V single-phase feeder supplies an 80 A continuous load and a 40 A noncontinuous load. What minimum ampacity must the feeder conductors have per NEC?
160 A
140 A
120 A
100 A
NEC requires conductor ampacity ≥ (125% à - continuous) + noncontinuous. That is (1.25 à - 80 A) + 40 A = 100 A + 40 A = 140 A minimum.
Calculate the kVA rating required for a three-phase transformer supplying a balanced 30 kW load at 0.9 power factor.
36 kVA
33.3 kVA
30 kVA
27 kVA
Transformer kVA = kW ÷ PF = 30 kW ÷ 0.9 = 33.33 kVA. This ensures the transformer can handle real power with the given power factor.
When seven current-carrying conductors of the same size are installed in a raceway, what ampacity adjustment factor applies per NEC Table 310.15(C)?
70%
80%
60%
50%
NEC Table 310.15(C) specifies a 70% ampacity adjustment when 7 or 8 current-carrying conductors share a raceway. Fewer conductors allow higher percentages.
What is the correct formula for calculating real power in a three-phase system?
P = V à - I à - cosφ
P = I² à - R
P = √3 à - V à - I à - PF
P = 3 à - V à - I à - cosφ
Real power in a three-phase system is calculated as P = √3 à - line voltage à - line current à - power factor. Single-phase formulas and pure resistive formulas do not apply.
According to NEC box fill rules, if a box contains four 12 AWG current-carrying conductors and two 12 AWG equipment grounding conductors, what minimum box volume in cubic inches is required?
15 cu in.
13.5 cu in.
7.5 cu in.
11.25 cu in.
Per NEC, #12 conductors count as 2.25 cu in. each current-carrying conductor (4 Ã - 2.25 = 9 cu in.) plus all equipment grounds count as one conductor (2.25 cu in.) for a total of 11.25 cu in.
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Learning Outcomes

  1. Master National Electrical Code regulations relevant to licensing exams.
  2. Identify key wiring methods and safety protocols for installations.
  3. Apply complex circuitry calculations for residential and commercial setups.
  4. Evaluate troubleshooting strategies for common electrical faults.
  5. Demonstrate proficiency in conductor sizing and load calculations.

Cheat Sheet

  1. Understand the National Electrical Code (NEC) requirements for wiring methods - Discover how to use metal raceways, cable trays, and enclosures like a wiring wizard. Following these guidelines ensures your installations are both safe and inspection-ready. OSHA Standard 1910.305
  2. Familiarize yourself with OSHA's regulations on wiring methods, components, and equipment for general use - Study OSHA guidelines to maintain safe installations on construction sites - no spark left behind! Staying up to code helps prevent accidents and keeps projects running smoothly. OSHA Standard 1926.405
  3. Learn the proper sizing of conductors and overcurrent protection devices - Master how to select the right conductor sizes and fuse or breaker capacities like a sizing superhero. Correct sizing prevents overheating and fire hazards while boosting energy efficiency. NFPA NEC Guide
  4. Master the calculations for determining voltage drop in circuits - Calculate voltage drop to ensure your equipment gets the perfect power - no dim bulbs here! Keeping voltage within limits maximizes performance and prevents heat buildup. NFPA NEC Guide
  5. Understand the grounding and bonding requirements - Learn how grounding and bonding protect users from shock and stabilize systems like a real-life superhero. Proper techniques reduce equipment damage and guard against dangerous surges. NFPA NEC Guide
  6. Study the NEC's guidelines on the installation of electrical equipment in hazardous locations - Explore methods to safely wire equipment in hazardous zones - keep fire and explosions at bay! Adhering to these rules protects both people and property. NFPA NEC Guide
  7. Review the safety protocols for working with live circuits - Get to grips with lockout/tagout procedures, PPE, and safe practices - stay shock-free and savvy! Prioritizing safety keeps you and your crew accident-free. NFPA NEC Guide
  8. Understand the requirements for installing and maintaining electrical panels - Dive into panel clearances, labeling, and accessibility - inspectors will be impressed! Proper maintenance ensures reliable power distribution and quick troubleshooting. NFPA NEC Guide
  9. Learn the procedures for troubleshooting common electrical faults - Develop quick-step approaches to diagnose short circuits, ground faults, and open circuits - be the electrical detective your team needs! Efficient troubleshooting minimizes downtime and keeps systems humming. NFPA NEC Guide
  10. Familiarize yourself with the NEC's requirements for residential and commercial wiring - Compare branch circuits, feeders, and service installation rules to design layouts that shine in both home and industrial settings! Knowing these differences helps you excel on any job. NFPA NEC Guide
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