Download Journeyman Electrician Licensing Examination Question And Correct Answers and more Exams Electrical and Electronics Engineering in PDF only on Docsity!
Journeyman Electrician Licensing
Examination Question And Correct
Answers (Verified Answers) Plus
Rationales 2026 Q&A Instant Download
Pdf
- What is the primary purpose of a circuit breaker? A. Increase voltage B. Protect a circuit from overcurrent C. Store electrical energy D. Convert AC to DC Rationale: A circuit breaker automatically interrupts current flow when excessive current or a short circuit occurs, protecting wiring and equipment from overheating and fire hazards.
- Which unit measures electrical resistance? A. Volt B. Ohm C. Ampere D. Watt Rationale: Resistance is measured in ohms (Ω), which indicates how much a material opposes the flow of electric current.
- Ohm’s Law is expressed as: A. P = VI
B. V = IR
C. I = PR
D. V = P/R
Rationale: Ohm’s Law defines the relationship between voltage, current, and resistance: Voltage equals current multiplied by resistance.
- The function of a fuse is to: A. Regulate voltage B. Store energy C. Break a circuit when current is excessive D. Increase current flow Rationale: A fuse melts under excessive current, opening the circuit and preventing damage or fire.
- The standard frequency of AC power in residential systems is: A. 30 Hz B. 50 Hz C. 60 Hz D. 120 Hz Rationale: In North America and many other regions, standard household alternating current operates at 60 Hz.
- What does a GFCI protect against? A. Overvoltage B. Overcurrent C. Ground faults and electric shock D. Short circuits only Rationale: A Ground Fault Circuit Interrupter detects imbalance in current and quickly shuts off power to prevent shock.
11.NEC stands for: A. National Electrical Codebook B. National Electrical Code C. Network Electrical Control D. Neutral Energy Circuit Rationale: The NEC provides standardized electrical installation safety guidelines in the United States. 12.What happens to resistance when wire length increases? A. Decreases B. Increases C. Stays constant D. Becomes zero Rationale: Longer wire increases resistance due to more opposition to electron flow. 13.A conductor is a material that: A. Blocks electricity B. Allows electricity to flow easily C. Stores voltage D. Converts energy Rationale: Conductors like copper allow electrons to move freely. 14.Which device protects against overloads? A. Transformer B. Switch C. Circuit breaker D. Capacitor
Rationale: Circuit breakers interrupt current when overload conditions occur. 15.The purpose of insulation on wires is to: A. Increase current B. Prevent electrical contact and shock C. Reduce voltage D. Conduct electricity Rationale: Insulation prevents unintended current flow and protects users. 16.Power in a circuit is measured in: A. Volts B. Amps C. Watts D. Ohms Rationale: Electrical power is the rate of energy transfer, measured in watts. 17.A series circuit has: A. Multiple paths B. One continuous path C. No resistance D. Infinite current Rationale: In a series circuit, current flows through a single path. 18.The function of a transformer is to: A. Store energy B. Convert DC to AC C. Step up or step down voltage
C. White or gray D. Black Rationale: Neutral conductors are identified by white or gray insulation. 23.What device converts mechanical energy into electrical energy? A. Transformer B. Generator C. Capacitor D. Resistor Rationale: A generator produces electricity from mechanical motion. 24.The formula P = VI represents: A. Resistance B. Current C. Power D. Voltage drop Rationale: Electrical power equals voltage multiplied by current. 25.Which material is a poor conductor? A. Copper B. Aluminum C. Rubber D. Silver Rationale: Rubber is an insulator and resists electrical flow. 26.The purpose of a relay is to: A. Store charge B. Reduce resistance C. Control a circuit using a low-power signal
D. Increase voltage Rationale: A relay uses a small current to control a larger load. 27.Inductance is measured in: A. Ohms B. Watts C. Henrys D. Amps Rationale: Inductance is the property of coils resisting changes in current. 28.AC stands for: A. Alternating Current B. Automatic Circuit C. Alternating Current D. Active Control Rationale: AC is a type of electrical current that reverses direction periodically. 29.DC stands for: A. Direct Circuit B. Dual Current C. Direct Current D. Dynamic Charge Rationale: DC flows in one constant direction. 30.A capacitor stores: A. Resistance B. Electrical energy in an electric field C. Current
D. Measure voltage Rationale: Bus bars distribute power efficiently in panels. 35.Electrical resistance increases with: A. Lower temperature B. Higher temperature C. Shorter wire D. Lower voltage Rationale: Heat increases atomic vibration, increasing resistance. 36.A multimeter measures: A. Only voltage B. Voltage, current, and resistance C. Only current D. Only resistance Rationale: A multimeter is a multi-function electrical measuring tool. 37.The safest practice before working on a circuit is to: A. Increase voltage B. Test continuity only C. De-energize the circuit D. Increase load Rationale: Always disconnect power before working to prevent shock. 38.Electrical energy is converted to heat in: A. Capacitor B. Resistor C. Transformer
D. Switch Rationale: Resistance causes energy loss as heat. 39.A neutral wire carries current: A. Always to ground B. Back to the source C. Only during faults D. Never Rationale: Neutral completes the circuit by returning current. 40.The main service panel distributes: A. Water B. Heat C. Electrical power D. Air Rationale: It distributes incoming electricity to branch circuits. 41.A voltmeter is connected: A. In series B. In parallel C. Across ground only D. Randomly Rationale: Voltage is measured across components in parallel. 42.Current increases when resistance: A. Increases B. Decreases C. Stays constant
D. Ohms Rationale: Fuse rating indicates maximum current allowed. 47.Electrical power formula P = I²R is used to calculate: A. Voltage B. Power loss due to resistance C. Resistance D. Current only Rationale: This formula calculates heat loss in conductors. 48.A switch is used to: A. Store energy B. Open or close a circuit C. Increase resistance D. Convert AC to DC Rationale: Switches control circuit continuity. 49.The unit of electric charge is: A. Ampere B. Coulomb C. Volt D. Watt Rationale: Coulomb measures the quantity of electric charge. 50.Electrical load refers to: A. Power source B. Wiring system C. Device consuming electrical energy D. Ground system
Rationale: Loads convert electrical energy into other forms like light or heat. QUESTIONS 51– 100 51.A kilowatt-hour measures: A. Current B. Energy consumption C. Resistance D. Voltage Rationale: It represents energy used over time. 52.The function of a contactor is: A. Measure voltage B. Switch high-power circuits remotely C. Store current D. Reduce resistance Rationale: Contactors control large electrical loads using low control signals. 53.Which hazard is most associated with arc flash? A. Noise only B. Low voltage C. Explosive release of energy and heat D. Water damage Rationale: Arc flash releases intense heat and pressure. 54.The purpose of a neutral bus bar is to: A. Store energy B. Connect neutral conductors
D. Circuit is off Rationale: Arc is a discharge of electricity through air. 59.A three-phase system is used for: A. Lighting only B. Industrial power distribution C. Low voltage only D. Batteries Rationale: It provides efficient power for heavy loads. 60.The main advantage of copper over aluminum is: A. Cheaper cost B. Lower conductivity C. Higher conductivity and durability D. Lighter weight Rationale: Copper conducts electricity more efficiently. 61.The purpose of a disconnect switch is to: A. Increase current B. Isolate equipment from power source C. Store energy D. Convert AC Rationale: It allows safe maintenance by cutting power. 62.Voltage is also referred to as: A. Resistance B. Electric potential difference C. Current flow
D. Energy loss Rationale: Voltage is potential energy per charge. 63.The NEC is updated every: A. 2 years B. 3 years C. 5 years D. 10 years Rationale: The National Electrical Code is revised every three years. 64.An overload condition occurs when: A. Voltage is zero B. Current exceeds safe rating C. Resistance increases D. Frequency drops Rationale: Excess current causes overheating. 65.Ground resistance should be: A. High B. Low C. Infinite D. Variable Rationale: Low resistance ensures effective fault current dissipation. 66.A circuit with excessive resistance will have: A. Higher current B. Lower current C. No voltage
D. Measure resistance Rationale: Diodes act as one-way valves for current. 71.The safest way to test a live circuit is to use: A. Screwdriver B. Properly rated multimeter C. Bare wire D. Fuse Rationale: A multimeter safely measures electrical values. 72.Inductive loads include: A. Heaters B. Motors C. Lamps D. Resistors Rationale: Motors create magnetic fields and inductance. 73.Capacitive reactance occurs in: A. DC circuits only B. AC circuits C. Ground circuits D. Open circuits Rationale: Capacitors oppose AC current flow. 74.The purpose of PPE is to: A. Increase productivity B. Protect workers from hazards C. Increase voltage
D. Reduce cost Rationale: PPE reduces risk of injury. 75.A breaker trips due to: A. Low resistance B. Excess current flow C. High insulation D. Low voltage only Rationale: Overcurrent triggers breaker mechanism. 76.Electrical energy is measured in: A. Watts B. Joules C. Ohms D. Volts Rationale: Joules represent energy units. 77.The main purpose of insulation resistance testing is to: A. Increase voltage B. Check wire integrity C. Reduce current D. Store energy Rationale: It ensures insulation is not leaking current. 78.A variable resistor is called: A. Fuse B. Capacitor C. Potentiometer
