Download Nebraska Journeyman Electrician Licensing Examination (2026) – Practice Test Questions, and more Exams Electrical Engineering in PDF only on Docsity!
Nebraska Journeyman Electrician Licensing
Examination (2026) – Practice Test
Questions, Answers & Detailed Rationales
1. What is the primary purpose of the National Electrical Code (NEC)? A. To design power systems B. To ensure electrical installations are safe C. To regulate utility rates D. To certify electricians The NEC is primarily a safety standard, not a design manual or licensing system. It establishes minimum requirements to protect people and property from electrical hazards. 2. What is the maximum allowable voltage drop for branch circuits recommended by the NEC? A. 1% B. 3% C. 5% D. 10% The NEC recommends no more than 3% voltage drop on branch circuits to ensure equipment operates efficiently and safely.
3. Which conductor is typically used as the grounding conductor? A. Red wire B. White wire C. Green or bare copper wire D. Blue wire Grounding conductors are identified as green or bare copper and provide a safe fault current path. 4. What does “GFCI” stand for? A. General Fault Circuit Indicator B. Grounded Fuse Current Interrupter C. Ground Fault Circuit Interrupter D. Grounded Fault Control Interface GFCIs protect against shock by detecting imbalance in current flow. 5. Which part of the NEC covers wiring methods? A. Article 90 B. Article 100 C. Article 300 D. Article 500 Article 300 outlines general requirements for wiring methods and materials.
9. Which color is commonly used for a grounded (neutral) conductor? A. Green B. White C. Black D. Red White or gray insulation is used for neutral conductors. 10. What is Ohm’s Law? A. P = IV B. V = IR C. I = PR D. R = VI² Ohm’s Law defines voltage as current multiplied by resistance. 11. What does a fuse do? A. Regulates voltage B. Opens circuit when current is excessive C. Stores energy D. Converts AC to DC Fuses melt under excess current to protect circuits. 12. What is the standard frequency of AC power in the U.S.? A. 25 Hz B. 50 Hz
C. 60 Hz D. 100 Hz U.S. electrical systems operate at 60 Hz.
13. Which tool is used to measure electrical current? A. Voltmeter B. Ammeter C. Ohmmeter D. Tachometer Ammeter measures current in amperes. 14. What is the purpose of a transformer? A. Store electricity B. Convert DC to AC C. Change voltage levels D. Measure resistance Transformers step voltage up or down via electromagnetic induction. 15. What does NEC Article 250 cover? A. Lighting systems B. Wiring methods C. Grounding and bonding D. Motors Article 250 defines grounding and bonding requirements.
A. Power generation B. Protection for conductors C. Voltage increase D. Current storage Conduit protects wiring from damage and environmental hazards.
20. Which device protects motors from overload? A. Relay B. Transformer C. Overload relay D. Capacitor Overload relays protect motors from excessive current. 21. What is resistance measured in? A. Volts B. Amperes C. Ohms D. Watts Resistance is measured in ohms (Ω). 22. What is power formula? A. V = IR B. P = VI
C. I = PR
D. R = P/V²
Electrical power equals voltage times current.
23. What is the main purpose of grounding? A. Increase voltage B. Improve conductivity C. Provide fault current path to earth D. Store electricity Grounding protects against electric shock and equipment damage. 24. Which device measures voltage? A. Ammeter B. Voltmeter C. Ohmmeter D. Wattmeter A voltmeter measures potential difference. 25. What is a short circuit? A. High resistance path B. Low-resistance unintended path C. Open circuit D. Balanced load Short circuits allow excessive current flow.
A. Breaker B. Fuse C. Surge protector D. Transformer Surge protectors limit transient voltages.
30. What is the unit of electrical power? A. Volt B. Amp C. Watt D. Ohm Power is measured in watts. 31. What does a multimeter measure? A. Only voltage B. Only current C. Voltage, current, and resistance D. Frequency only Multimeters combine multiple measurement functions. 32. What is arc fault protection designed for? A. Overvoltage B. Electrical fire prevention C. Grounding systems D. Motor control
Arc fault breakers detect dangerous arcing conditions.
33. What is the main function of a relay? A. Increase resistance B. Electrically control a switch C. Store voltage D. Convert AC to DC Relays allow low-power control of high-power circuits. 34. What is inductance? A. Resistance to voltage B. Opposition to change in current C. Current storage D. Power loss Inductance resists changes in current flow. 35. What is capacitance? A. Resistance to current B. Ability to store electrical charge C. Voltage conversion D. Power generation Capacitors store electrical energy. 36. What is a breaker trip caused by?
C. Voltage drop D. Power loss Continuity means a complete path for current.
40. What tool checks continuity? A. Voltmeter B. Clamp meter C. Continuity tester D. Tachometer Continuity testers verify circuit completion. 41. What is the purpose of a capacitor in motors? A. Increase resistance B. Provide starting torque C. Reduce voltage D. Generate current Capacitors help start single-phase motors. 42. What is three-phase power? A. Single alternating waveform B. Three alternating currents offset by 120° C. DC system D. One-phase backup system Three-phase power provides constant power delivery.
43. What is a ground fault? A. High resistance fault B. Unintended current path to ground C. Open circuit D. Voltage increase Ground faults occur when current leaks to ground. 44. What is the purpose of a junction box? A. Generate power B. Enclose wire connections safely C. Increase voltage D. Measure current Junction boxes protect and organize wire splices. 45. What is resistance affected by? A. Voltage only B. Material, length, and temperature C. Current only D. Frequency Resistance depends on conductor properties. 46. What is a load in an electrical system?
Electricity poses risks of shock, burns, and fire.
50. What is the purpose of a grounding electrode system? A. Increase voltage stability B. Dissipate fault currents into earth safely C. Store electricity D. Boost current flow Grounding electrodes safely direct fault currents into the earth. 51. What is the purpose of a motor starter? A. Increase voltage B. Safely start and stop a motor C. Store electrical energy D. Measure current Motor starters control motor operation and protect against overload conditions. 52. What is the primary function of a circuit breaker? A. Store energy B. Increase resistance C. Interrupt current during faults D. Convert AC to DC Circuit breakers automatically open circuits during overloads or short circuits.
53. What is the typical color of a grounding conductor? A. White B. Black C. Green or bare copper D. Red Green or bare copper identifies grounding conductors. 54. What is an open circuit? A. A low resistance path B. A broken or incomplete electrical path C. A short circuit D. A grounded system Open circuits prevent current from flowing. 55. What is the purpose of a ballast in lighting systems? A. Increase voltage B. Regulate current in fluorescent lamps C. Store energy D. Ground fixtures Ballasts control current flow in discharge lighting systems. 56. What does impedance include?
Fuses break circuits under excessive current.
60. What is the NEC requirement for labeling disconnects? A. Optional B. Must identify equipment controlled C. Only in industrial systems D. Not required Disconnects must be clearly labeled for safety. 61. What is the function of a neutral bus bar? A. Ground equipment B. Terminate neutral conductors C. Increase voltage D. Store current Neutral bus bars connect neutral conductors in panels. 62. What happens in a series circuit? A. Voltage remains constant B. Current is the same through all components C. Voltage increases D. Resistance decreases Current is constant in series circuits. 63. What happens in a parallel circuit?
A. Current is constant B. Voltage is the same across all branches C. Resistance increases D. Power is lost Voltage remains constant in parallel circuits.
64. What is a kilowatt-hour? A. Power unit B. Energy consumption unit C. Voltage unit D. Resistance unit Kilowatt-hour measures energy usage. 65. What does a clamp meter measure? A. Voltage only B. Current without disconnecting circuit C. Resistance only D. Frequency only Clamp meters measure current safely. 66. What is skin effect in conductors? A. Heat loss B. Current flows near conductor surface at high frequency C. Voltage drop D. Resistance increase only in DC
