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Journeyman Electrician - R17 Contractor Exam, Exams of Technology

Technology

The Journeyman Electrician - R17 Contractor Exam tests the candidate's knowledge and ability to perform electrical work under the supervision of a master electrician. It covers topics such as electrical theory, wiring methods, system installation, and safety practices. Key areas include working with electrical circuits, understanding blueprints, and applying relevant electrical codes. This exam is typically a prerequisite for aspiring master electricians, and it ensures the candidate is fully capable of performing high-quality electrical work.

Typology: Exams

2024/2025

Available from 05/11/2025

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Journeyman Electrician - R17 Contractor Exam

1. What is the unit of electrical resistance?

o A) Volt

o B) Ampere

o C) Ohm

o D) Watt

Answer: C) Ohm

Explanation: Resistance is measured in ohms (Ω), representing the opposition to

current flow.

2. According to Ohm's Law, what is the current if the voltage is 12V and resistance is

3Ω?

o A) 4A

o B) 36A

o C) 0.25A

o D) 12A

Answer: A) 4A

Explanation: Ohm's Law: I = V/R → 12V / 3Ω = 4A.

3. What is the power consumed by a device drawing 5A at 240V?

o A) 48W

o B) 1200W

o C) 245W

o D) 12W

Answer: B) 1200W

Explanation: Power P = V × I → 240V × 5A = 1200W.

4. Which equation represents Ohm's Law?

o A) V = I + R

o B) V = I × R

o C) I = V - R

o D) R = V / I²

Answer: B) V = I × R

Explanation: Ohm's Law defines the relationship as Voltage = Current × Resistance.

5. A circuit has a voltage of 10V and a current of 2A. What is the resistance?

o A) 5Ω

o B) 20Ω

o C) 8Ω

o D) 2Ω

Answer: A) 5Ω

Explanation: R = V/I → 10V / 2A = 5Ω.

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What is the unit of electrical resistance? o A) Volt o B) Ampere o C) Ohm o D) Watt Answer: C) Ohm Explanation: Resistance is measured in ohms (Ω), representing the opposition to current flow.
According to Ohm's Law, what is the current if the voltage is 12V and resistance is 3Ω? o A) 4A o B) 36A o C) 0.25A o D) 12A Answer: A) 4A Explanation: Ohm's Law: I = V/R → 12V / 3Ω = 4A.
What is the power consumed by a device drawing 5A at 240V? o A) 48W o B) 1200W o C) 245W o D) 12W Answer: B) 1200W Explanation: Power P = V × I → 240V × 5A = 1200W.
Which equation represents Ohm's Law? o A) V = I + R o B) V = I × R o C) I = V - R o D) R = V / I² Answer: B) V = I × R Explanation: Ohm's Law defines the relationship as Voltage = Current × Resistance.
A circuit has a voltage of 10V and a current of 2A. What is the resistance? o A) 5Ω o B) 20Ω o C) 8Ω o D) 2Ω Answer: A) 5Ω Explanation: R = V/I → 10V / 2A = 5Ω.

If the resistance in a circuit doubles while the voltage remains the same, what happens to the current? o A) It doubles. o B) It halves. o C) It remains the same. o D) It quadruples. Answer: B) It halves. Explanation: I = V/R; doubling R halves I.
What is the unit of electrical power? o A) Joule o B) Watt o C) Coulomb o D) Henry Answer: B) Watt Explanation: Power is measured in watts (W).
A device operates at 120V and consumes 60W of power. What is the current it draws? o A) 0.5A o B) 2A o C) 120A o D) 60A Answer: A) 0.5A Explanation: I = P/V → 60W / 120V = 0.5A.
What does the symbol "I" represent in electrical formulas? o A) Voltage o B) Current o C) Resistance o D) Power Answer: B) Current Explanation: "I" stands for current, measured in amperes.
In a DC circuit, what direction does conventional current flow? o A) From negative to positive. o B) From positive to negative. o C) It alternates direction. o D) It flows in a loop without direction.

Answer: A) Purely real Explanation: Impedance of a resistor has only a real component. Code Definitions and Plan Interpretation

What does NEC Article 100 define? o A) Definitions o B) Wiring methods o C) Grounding requirements o D) Installation standards Answer: A) Definitions Explanation: NEC Article 100 provides definitions for terms used in the code.
In electrical schematics, what does a dashed line typically represent? o A) Physical wiring o B) Conduit o C) Symbolic connection o D) Ground Answer: C) Symbolic connection Explanation: Dashed lines often indicate symbolic or abstract connections.
What symbol represents a ground in a schematic diagram? o A) A horizontal line o B) A vertical line with three descending lines o C) A circle o D) A zigzag line Answer: B) A vertical line with three descending lines Explanation: This is the standard symbol for ground.
Which NEC article covers definitions related to electrical installations? o A) Article 90 o B) Article 100 o C) Article 200 o D) Article 300 Answer: B) Article 100 Explanation: Article 100 contains definitions used throughout the NEC.
When interpreting blueprints, what does a double line typically indicate? o A) Electrical conduit o B) Structural support o C) Ground wire o D) Hidden wiring

Answer: A) Electrical conduit Explanation: Double lines often represent conduits or raceways in blueprints.

What is the purpose of a legend on an electrical blueprint? o A) To provide measurements o B) To list symbols used o C) To show material specifications o D) To detail installation steps Answer: B) To list symbols used Explanation: A legend explains the symbols and abbreviations on the blueprint.
In NEC terminology, what is a "branch circuit"? o A) The main service line o B) Any circuit supplying power to outlets or devices o C) The grounding system o D) A dedicated circuit for appliances Answer: B) Any circuit supplying power to outlets or devices Explanation: Branch circuits distribute power from the service panel to various outlets and devices.
Which tool is essential for reading and interpreting electrical schematics? o A) Multimeter o B) Blueprint reader o C) Scale ruler o D) Schematic symbol guide Answer: D) Schematic symbol guide Explanation: A guide helps in understanding the symbols used in schematics.
What does a single line in a blueprint typically represent? o A) A physical wall o B) A simple wire o C) A conduit o D) A fixture Answer: B) A simple wire Explanation: Single lines often depict wiring between components.
Which NEC article addresses the general requirements for wiring methods? o A) Article 210 o B) Article 300 o C) Article 400 o D) Article 500

Answer: B) Copper Explanation: Copper is preferred for grounding due to its excellent conductivity and corrosion resistance.

Where is the service disconnect typically located? o A) Inside the building o B) Outside the building o C) In the attic o D) In the basement Answer: B) Outside the building Explanation: Service disconnects are usually located outside for easy access during emergencies.
What NEC article covers service equipment? o A) Article 230 o B) Article 240 o C) Article 250 o D) Article 310 Answer: A) Article 230 Explanation: Article 230 addresses requirements for service equipment and installations.
Which grounding electrode is most commonly used for residential services? o A) Ground rod o B) Metal water pipe o C) Concrete-encased electrode o D) All of the above Answer: D) All of the above Explanation: Multiple grounding electrodes can be used, including ground rods, metal water pipes, and concrete-encased electrodes.
What is the maximum size of the service entrance conductors for a 200A service? o A) 4 AWG copper o B) 2 AWG copper o C) 1/0 AWG copper o D) 3/0 AWG copper Answer: C) 1/0 AWG copper Explanation: For a 200A service, 1/0 AWG copper conductors are typically used, subject to specific code requirements.
What type of service entrance conductor is suitable for underground installations? o A) THHN

o B) USE cable o C) NM-B o D) MC cable Answer: B) USE cable Explanation: Underground Service Entrance (USE) cable is designed for direct burial and underground use.

Which device is used to prevent backfeeding from the utility to the grid? o A) Surge protector o B) GFCI o C) Interrupter o D) Main breaker Answer: D) Main breaker Explanation: The main breaker can disconnect power, preventing backfeeding to the utility. Service Calculations
What is the first step in performing a load calculation for a residential service? o A) Determining the square footage o B) Listing all appliances o C) Calculating the demand load o D) Selecting the service size Answer: A) Determining the square footage Explanation: Square footage is used to estimate the basic lighting and receptacle loads.
What is the standard demand factor for the first 300 watts of each appliance in residential load calculations? o A) 100% o B) 75% o C) 50% o D) 25% Answer: A) 100% Explanation: The first 300W of each appliance is calculated at 100% for demand.
For commercial services, which NEC section outlines the load calculation methods? o A) Article 220 o B) Article 230 o C) Article 240 o D) Article 310

In load calculations, what does the term "continuous load" refer to? o A) A load that operates for less than 3 hours o B) A load that operates for more than 3 hours o C) A fluctuating load o D) A starting load Answer: B) A load that operates for more than 3 hours Explanation: Continuous loads run for extended periods and may require derating.
Which NEC table is used to determine the basic lighting load per square foot in residential services? o A) Table 220. o B) Table 310. o C) Table 240. o D) Table 300. Answer: A) Table 220. Explanation: Table 220.12 provides standard lighting loads for residential services.
What is the general rule for sizing service conductors based on calculated load? o A) Use the next higher standard conductor size o B) Use the exact calculated size o C) Use the next lower standard conductor size o D) Always use 4 AWG Answer: A) Use the next higher standard conductor size Explanation: Conductors are sized to the next standard size to ensure safety and compliance. Code Definitions and Plan Interpretation
According to NEC, what is a "grounded conductor"? o A) A conductor intended to carry current o B) A conductor connected to earth ground o C) A conductor that is part of a raceway system o D) A conductor used for communication signals Answer: B) A conductor connected to earth ground Explanation: A grounded conductor is intentionally connected to the earth for safety.
What does "GFCI" stand for in electrical terminology? o A) Ground Fault Circuit Interrupter o B) General Function Current Interrupter o C) Grounded Function Current Indicator

o D) General Fault Current Interrupter Answer: A) Ground Fault Circuit Interrupter Explanation: GFCI devices protect against ground faults by interrupting the circuit.

In electrical plans, what does a circle with an "X" typically represent? o A) Switch o B) Outlet o C) Light fixture o D) Junction box Answer: D) Junction box Explanation: A circle with an "X" often denotes a junction box in plans.
What is the NEC definition of "service conductors"? o A) Conductors running from the service equipment to the grounding electrode o B) Conductors running from the utility to the service equipment o C) Conductors within a raceway o D) Conductors used for branch circuits Answer: B) Conductors running from the utility to the service equipment Explanation: Service conductors connect the utility supply to the service equipment.
How are neutral conductors typically identified in electrical schematics? o A) Black lines o B) Red lines o C) White lines o D) Green lines Answer: C) White lines Explanation: Neutral conductors are usually depicted with white lines in schematics.
What is the purpose of a "bonding jumper" in service equipment? o A) To connect the neutral to the ground o B) To protect against overcurrent o C) To provide a path for current during faults o D) To isolate different circuits Answer: C) To provide a path for current during faults Explanation: Bonding jumpers ensure a reliable path for fault current to facilitate breaker operation.
In plan interpretation, what does a dashed double line indicate? o A) Hidden wiring o B) Conduit pathway o C) Structural element

Answer: A) One Explanation: At least one grounding electrode is required, though more may be needed based on conditions.

Which material is commonly used for service entrance conductors in residential applications? o A) Aluminum o B) Copper o C) Both A and B o D) Steel Answer: C) Both A and B Explanation: Both aluminum and copper are commonly used for service entrance conductors, depending on the application.
What type of meter is used to measure the total electrical consumption of a building? o A) Voltmeter o B) Ammeter o C) Wattmeter o D) Energy meter Answer: D) Energy meter Explanation: An energy meter records total electrical usage for billing and monitoring.
Where should the main service disconnect be located according to NEC? o A) Within sight of the service point o B) Inside the building o C) In the basement o D) On the roof Answer: A) Within sight of the service point Explanation: The main disconnect must be accessible and visible from where the service enters the building.
What is the purpose of an overcurrent protection device? o A) To regulate voltage levels o B) To interrupt excessive current o C) To measure current flow o D) To store electrical energy Answer: B) To interrupt excessive current Explanation: Overcurrent devices prevent damage by interrupting current that exceeds safe levels.

Which NEC article specifies requirements for service equipment? o A) Article 220 o B) Article 230 o C) Article 240 o D) Article 250 Answer: B) Article 230 Explanation: Article 230 covers specifications for service equipment installations.
What is the typical maximum voltage drop allowed for feeders and branch circuits? o A) 1% o B) 3% o C) 5% o D) 10% Answer: C) 5% Explanation: A maximum of 5% voltage drop is generally recommended to ensure efficient operation.
Which component connects the service entrance conductors to the grounding electrode? o A) Main breaker o B) Bonding jumper o C) Neutral bar o D) Ground bus Answer: B) Bonding jumper Explanation: A bonding jumper connects service conductors to the grounding electrode system.
What is the function of a meter socket? o A) To house the energy meter o B) To protect the service panel o C) To connect grounding conductors o D) To distribute branch circuits Answer: A) To house the energy meter Explanation: The meter socket holds the utility's energy meter.
In service equipment, what color is typically used for the grounding bus? o A) Black o B) Red o C) White o D) Green or bare

If a residential service has a total load of 100 kW, what is the minimum service size according to NEC? o A) 200A o B) 400A o C) 600A o D) 800A Answer: B) 400A Explanation: 100 kW typically requires a 400A service, based on standard NEC load calculations.
Which NEC table is used to determine the load of fixed appliances? o A) Table 220. o B) Table 220. o C) Table 220. o D) Table 220. Answer: A) Table 220. Explanation: Table 220.55 provides load values for fixed appliances and other specific uses.
When sizing a service, which factor accounts for future expansion? o A) Diversity factor o B) Demand factor o C) Load factor o D) Safety factor Answer: D) Safety factor Explanation: A safety factor is included to accommodate potential future load increases.
What is the minimum conductor size for a 100A service according to NEC? o A) 6 AWG copper o B) 4 AWG aluminum o C) 3 AWG copper o D) 2 AWG aluminum Answer: B) 4 AWG aluminum Explanation: For a 100A service, 4 AWG aluminum conductors are typically the minimum size.
Which NEC section provides guidelines for service load calculations? o A) Section 210. o B) Section 230. o C) Section 220. o D) Section 240.

Answer: C) Section 220. Explanation: Section 220.12 outlines basic load calculations for services.

What is the term for the reduction in conductor size based on ambient temperature? o A) Derating o B) Upsizing o C) Overcurrent protection o D) Phase balancing Answer: A) Derating Explanation: Derating adjusts conductor sizes based on environmental factors like temperature. Electrical Theory and Calculations
What is the relationship between power, voltage, and resistance in a circuit? o A) P = V² / R o B) P = R / V² o C) P = V / R² o D) P = R × V Answer: A) P = V² / R Explanation: Power can be calculated as voltage squared divided by resistance.
In a series circuit, how does the total resistance compare to individual resistances? o A) Total resistance is the sum of individual resistances o B) Total resistance is the product of individual resistances o C) Total resistance is the average of individual resistances o D) Total resistance is less than any individual resistance Answer: A) Total resistance is the sum of individual resistances Explanation: In series, resistances add up to form the total resistance.
What type of current flows in only one direction? o A) Alternating Current (AC) o B) Direct Current (DC) o C) Pulsating Current o D) Ripple Current Answer: B) Direct Current (DC) Explanation: DC flows steadily in one direction, unlike AC which alternates.
Which component stores electrical energy in a magnetic field? o A) Capacitor

In a three-phase system, how many conductors are typically used? o A) Two o B) Three o C) Four o D) Five Answer: C) Four Explanation: A typical three-phase system uses three conductors for phases and one neutral.
What is the power factor of a purely resistive load? o A) 0 o B) 0. o C) 1 o D) - 1 Answer: C) 1 Explanation: A purely resistive load has a power factor of 1, meaning voltage and current are in phase.
What type of load has both resistive and reactive components? o A) Purely resistive o B) Purely inductive o C) Purely capacitive o D) Inductive-resistive Answer: D) Inductive-resistive Explanation: Inductive-resistive loads combine both resistance and inductance.
What is the function of a capacitor in an electrical circuit? o A) To store electrical energy o B) To increase resistance o C) To convert AC to DC o D) To provide a path for current Answer: A) To store electrical energy Explanation: Capacitors store energy in an electric field, useful for filtering and energy storage.
What is the total capacitance of two 10μF capacitors connected in parallel? o A) 5μF o B) 10μF o C) 20μF o D) 100μF

Answer: C) 20μF Explanation: In parallel, capacitances add: 10μF + 10μF = 20μF.

In a purely capacitive circuit, how does the current relate to the voltage? o A) Current leads voltage by 90 degrees o B) Current lags voltage by 90 degrees o C) Current and voltage are in phase o D) There is no current Answer: A) Current leads voltage by 90 degrees Explanation: In capacitive circuits, current leads voltage by 90 degrees.
What is the primary difference between a conductor and an insulator? o A) Conductors allow current flow; insulators do not o B) Insulators allow current flow; conductors do not o C) Conductors have higher resistance than insulators o D) Insulators have higher conductivity than conductors Answer: A) Conductors allow current flow; insulators do not Explanation: Conductors facilitate the flow of electric current, whereas insulators resist it.
What is the primary unit of electrical energy? o A) Watt o B) Ampere o C) Volt o D) Joule Answer: D) Joule Explanation: Electrical energy is measured in joules (J).
What component is used to limit current in a circuit? o A) Capacitor o B) Inductor o C) Resistor o D) Transformer Answer: C) Resistor Explanation: Resistors limit current flow by providing resistance.
What is the term for the opposition to current flow in an AC circuit? o A) Resistance o B) Reactance o C) Impedance o D) Conductance

Journeyman Electrician - R17 Contractor Exam, Exams of Technology

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