Chicago 303 Supervising Electrician Practice Exam (Chicago Electrical Code 2018 Edition)
Please choose the "best" choice for each question.
You'll have 4-hours to complete the 150 question exam.
Covers the following section :
Principles and Practices of Electricity
Chicago Administration Chapters 2,4, and 13
OSHA Safety Practices
2018 Chicago Electrical Code (NEC 2017)
Good Luck!
- 1.
⦁ What is used to measure resistance directly?
- A.
Amp Meter
- B.
Multi Meter
- C.
Volt Meter
- D.
Ohmeter
Correct Answer
D. OhmeterExplanation
An ohmmeter is used to measure resistance directly. Unlike other meters mentioned, an ohmmeter is specifically designed to measure the resistance of a circuit component. It applies a known voltage to the component and measures the resulting current, allowing for an accurate measurement of resistance. Amp meters measure current, volt meters measure voltage, and multi meters can measure various electrical quantities including resistance, but an ohmmeter is the most direct and accurate tool for measuring resistance.Rate this question:
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- 2.
⦁ What does this symbol represent?
- A.
Adjustable capacitor
- B.
Capacitor
- C.
Battery
- D.
Disconnect
Correct Answer
B. CapacitorExplanation
The symbol represents a capacitor. A capacitor is an electronic component used to store and release electrical energy. It consists of two conductive plates separated by an insulating material, and the symbol represents these plates with curved lines. The symbol is commonly used in circuit diagrams to indicate the presence of a capacitor.Rate this question:
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- 3.
⦁ What is a Ohm?
- A.
Unit of Power
- B.
Unit of Electrical resistance
- C.
Unit of Ampere
- D.
Inductance
Correct Answer
B. Unit of Electrical resistanceExplanation
An Ohm is the unit of electrical resistance. It is used to measure how much a material or device resists the flow of electric current. The higher the resistance, the more difficult it is for the current to pass through. This unit is named after the German physicist Georg Simon Ohm, who discovered Ohm's law, which states that the current flowing through a conductor is directly proportional to the voltage applied across it and inversely proportional to the resistance of the conductor.Rate this question:
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- 4.
⦁ What is used to measure resistance directly?
- A.
Amp Meter
- B.
Multi Meter
- C.
Volt Meter
- D.
Ohmeter
Correct Answer
D. OhmeterExplanation
An ohmmeter is used to measure resistance directly. It is a device that applies a known voltage to a circuit and measures the resulting current. By using Ohm's law (V = IR), the ohmmeter can calculate the resistance of the circuit. Unlike an ammeter, which measures current, or a voltmeter, which measures voltage, an ohmmeter is specifically designed to measure resistance. A multimeter is a versatile device that can measure resistance, current, and voltage, but an ohmmeter is specifically designed for measuring resistance.Rate this question:
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- 5.
⦁ What is an Ampere?
- A.
Rate of flow of electricity
- B.
Electromotive FORCE) Is the FORCE or pressure, measured in Volts, which makes the electrons move or tends to do so.
- C.
Measured in Amperes, movement or flow of electricity.
- D.
Are properties of an electrical circuit that opposes current.
Correct Answer
A. Rate of flow of electricityExplanation
An Ampere is a unit of measurement used to quantify the rate of flow of electricity. It represents the amount of electric current flowing through a circuit. The higher the amperage, the greater the flow of electricity.Rate this question:
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- 6.
⦁ What is Ampacity?
- A.
Always flows in the same direction
- B.
Moving in one direction reversed at regular intervals.
- C.
Maximum current in amperes, that a conductor can carry under continuously under the conditions of use without exceeding its temperature rating.
- D.
Provided that the temperature remains constant, the ratio of potential difference (p.d.) across the ends of a conductor (R) to the current (I) flowing in that conductor will also be constant
Correct Answer
C. Maximum current in amperes, that a conductor can carry under continuously under the conditions of use without exceeding its temperature rating.Explanation
Ampacity refers to the maximum current in amperes that a conductor can carry continuously without exceeding its temperature rating. This means that the conductor can handle this amount of current without overheating or causing any damage. It is important to consider ampacity when designing electrical systems to ensure that the conductors are sized appropriately to handle the expected current load.Rate this question:
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- 7.
⦁ What is Electric Current?
- A.
Are properties of an electrical circuit that opposes current.
- B.
Measured in Amperes, movement or flow of electricity.
- C.
An alternating current flows through a conductor, there is an inductive action whereby the current in the conductor is forced toward its surface.
- D.
Converting electrical in an AC system at one voltage or current into electrical power at some other voltage or current the use of rotating parts.
Correct Answer
B. Measured in Amperes, movement or flow of electricity.Explanation
Electric current refers to the movement or flow of electricity. It is measured in Amperes. This means that it quantifies the rate at which electric charges are flowing through a conductor. The flow of electric current is essential for the functioning of electrical circuits and devices. It is the movement of these electric charges that enables the transfer of energy and the operation of various electrical components.Rate this question:
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- 8.
⦁ What is EMF?
- A.
Always flows in the same direction
- B.
Measured in Amperes, movement or flow of electricity.
- C.
Moving in one direction reversed at regular intervals.
- D.
FORCE or pressure, measured in Volts, which makes the electrons move or tends to do so.
Correct Answer
D. FORCE or pressure, measured in Volts, which makes the electrons move or tends to do so.Explanation
EMF stands for electromotive force, which is a FORCE or pressure that is measured in Volts. This force is responsible for making electrons move or tends to do so. It is important to note that EMF always flows in the same direction.Rate this question:
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- 9.
⦁ Is a Volt a unit of EMF?
- A.
True
- B.
False
Correct Answer
A. TrueExplanation
A Volt is indeed a unit of electromotive force (EMF). EMF is the measure of the electric potential difference between two points in an electrical circuit, and it is measured in volts. Therefore, it is correct to say that a Volt is a unit of EMF.Rate this question:
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- 10.
⦁ You can test volts with Ammeter and volt-millimeter?
- A.
True
- B.
False
Correct Answer
B. FalseExplanation
An ammeter measures electric current in amperes, while a voltmeter measures voltage in volts. To test voltage, you would use a voltmeter, not an ammeter.Rate this question:
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- 11.
⦁ Direct Current
- A.
Always flows in the same direction
- B.
Flows in opposite directions
- C.
All of the above
- D.
None of the above
Correct Answer
A. Always flows in the same directionExplanation
Direct current always flows in the same direction. This means that the flow of electric charge is constant and does not change its direction over time. Unlike alternating current, which periodically changes direction, direct current maintains a consistent flow in one direction. Therefore, the correct answer is "Always flows in the same direction".Rate this question:
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- 12.
⦁ Alternating Current tends to move in one direction?
- A.
True
- B.
False
Correct Answer
B. FalseExplanation
Alternating Current (AC) does not move in one direction. It constantly changes direction, oscillating back and forth. This is different from Direct Current (DC), which flows in one direction only. AC is commonly used in electrical power transmission and distribution systems due to its ability to be easily transformed to different voltage levels and its efficiency in long-distance transmission.Rate this question:
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- 13.
⦁ Coulombs Law V=IxR Amps x Resistance Provided that the temperature remains constant, the ratio of potential difference (p.d.) across the ends of a conductor (R) to the current (I) flowing in that conductor will change.
- A.
True
- B.
False
Correct Answer
B. FalseExplanation
The statement is false because according to Ohm's Law, the potential difference (V) across the ends of a conductor is directly proportional to the current (I) flowing in that conductor, given that the resistance (R) remains constant. Therefore, the ratio of potential difference to current will remain constant as long as the temperature remains constant.Rate this question:
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- 14.
⦁ What describes the skin effect?
- A.
When an alternating current flows through a conductor, there is an inductive action whereby the current in the conductor is forced toward the inner surface.
- B.
When an alternating current flows through a conductor, there is an inductive action whereby the current in the conductor is forced toward its surface.
- C.
None of the above
Correct Answer
B. When an alternating current flows through a conductor, there is an inductive action whereby the current in the conductor is forced toward its surface.Explanation
The skin effect describes the phenomenon where, when an alternating current flows through a conductor, the current is forced toward the surface of the conductor. This occurs due to the inductive action caused by the alternating current. The current tends to concentrate near the surface of the conductor, resulting in a higher current density at the surface compared to the inner parts of the conductor. This effect is more pronounced at higher frequencies and can lead to increased resistance and power loss in the conductor.Rate this question:
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- 15.
⦁ Reactance and resistance are properties of an electrical circuit that opposes current. The main difference between resistance and reactance is that resistance measures the opposition to a flow of current, whereas reactance measures the direction of current.
- A.
True
- B.
False
Correct Answer
B. FalseExplanation
Resistance and reactance are both properties of an electrical circuit that oppose the flow of current. However, the main difference between the two is that resistance measures the overall opposition to current flow, while reactance specifically measures the opposition to the change in direction of current flow. Therefore, the statement that reactance measures the direction of current is incorrect.Rate this question:
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- 16.
⦁ Conductors for underground wiring
- A.
Shall be XHHW
- B.
Shall be THWN
- C.
Shall be Wet Listed
- D.
Shall be XLP
Correct Answer
C. Shall be Wet ListedExplanation
The correct answer is "Shall be Wet Listed." This means that the conductors used for underground wiring should be approved for use in wet locations. Wet Listed conductors have been tested and certified to be safe and reliable in environments where they may be exposed to moisture or water. This ensures that the wiring system will function properly and reduce the risk of electrical hazards.Rate this question:
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- 17.
⦁ A transformer is best described as converting electrical in an AC system at one voltage or current into electrical power at some other voltage or current the use of rotating parts.
- A.
True
- B.
False
Correct Answer
B. FalseExplanation
A transformer is best described as a static electrical device that converts electrical power in an AC (Alternating Current) system from one voltage or current level to another voltage or current level without the use of rotating parts. It operates on the principle of electromagnetic induction and is commonly used for voltage transformation, current transformation, impedance matching, and isolation in electrical circuits. Transformers are fundamental components in electrical distribution and power transmission systems.Rate this question:
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- 18.
⦁ A transformers primary winding is connected to the source of power, it will have high voltage winding only.
- A.
True
- B.
False
Correct Answer
B. FalseExplanation
The statement is false because a transformer's primary winding is connected to the source of power, and it can have both high voltage and low voltage windings. The primary winding is designed to handle the high voltage from the power source, while the secondary winding is designed to deliver a lower voltage output. This allows transformers to step up or step down the voltage as needed.Rate this question:
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- 19.
⦁ Advantage of three-phase transformer?
- A.
Lower cost, Less efficiency, less floor space and weight, simpler wiring, less cost transportation
- B.
Higher cost, higher efficiency, less floor space and weight, simpler wiring, less cost transportation
- C.
Lower cost, higher efficiency, less floor space and weight, simpler wiring, less cost transportation
- D.
Lower cost, higher efficiency, greater floor space and weight, simpler wiring, more cost transportation
Correct Answer
C. Lower cost, higher efficiency, less floor space and weight, simpler wiring, less cost transportationExplanation
The advantage of a three-phase transformer is that it offers lower cost, higher efficiency, less floor space and weight, simpler wiring, and less cost transportation compared to other options. This means that it is more cost-effective, takes up less space, and is easier to install and transport. Additionally, it provides higher efficiency, which means that it converts electrical energy more effectively and reduces energy losses. Overall, a three-phase transformer offers several benefits that make it a favorable choice in terms of cost, efficiency, and practicality.Rate this question:
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- 20.
⦁ If a faulty temporary GFCI receptacle is found, what should happen?
- A.
Notify supervisor on-site.
- B.
Contact the General Contractor
- C.
Contact the owner
- D.
Fix it immediately
Correct Answer
A. Notify supervisor on-site.Explanation
If a faulty temporary GFCI receptacle is found, the appropriate action to take would be to notify the supervisor on-site. This is because the supervisor is responsible for overseeing the work and ensuring safety protocols are followed. By informing the supervisor, they can take the necessary steps to address the issue, such as replacing the faulty receptacle or contacting the appropriate personnel to fix it. It is important to prioritize safety and proper communication in such situations.Rate this question:
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- 21.
⦁ Voltage Drop @75degress for a #3/0 cable travelling a 100’ @ 15A, 120v?
- A.
.20
- B.
.16
- C.
.005
- D.
.017
Correct Answer
B. .16Explanation
The correct answer is .16. This answer represents the voltage drop for a #3/0 cable traveling a distance of 100 feet at a current of 15A and voltage of 120V. The voltage drop is a measure of the reduction in voltage that occurs as electricity flows through a conductor. In this case, the .16 value indicates that there will be a voltage drop of .16 volts over the 100-foot distance.Rate this question:
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- 22.
⦁ Power factor Is the ratio of the true power or watts to the apparent power or voltamperes.
- A.
True
- B.
False
Correct Answer
A. TrueExplanation
The power factor is indeed the ratio of the true power or watts to the apparent power or voltamperes. This means that it represents the efficiency of an electrical system in converting electrical power into useful work. A power factor of 1 indicates a system with maximum efficiency, while a power factor less than 1 indicates a system with inefficiencies such as reactive power. Therefore, the statement "True" accurately reflects the definition of power factor.Rate this question:
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- 23.
⦁ If violations that threaten life, health or safety are found,
- A.
Cut power to the building.
- B.
A fine of $1,000.00 will be issued.
- C.
Building can be closed.
- D.
Warning will be provided.
Correct Answer
C. Building can be closed.Explanation
If violations that threaten life, health or safety are found, the building can be closed. This means that if there are serious violations that could potentially harm people's lives, health, or safety, the authorities have the authority to shut down the building temporarily until the issues are resolved. This action is taken to protect the well-being of the occupants and ensure that necessary repairs or improvements are made to the building.Rate this question:
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- 24.
⦁ If a sign permit has been denied, what option does the contractor have, who has the final say?
- A.
(AHJ) Building Commissioner
- B.
Inspector
- C.
General Contractor
- D.
Supervising Electrician
Correct Answer
A. (AHJ) Building CommissionerExplanation
If a sign permit has been denied, the contractor can appeal the decision to the (AHJ) Building Commissioner. The Building Commissioner has the final say in granting or denying sign permits.Rate this question:
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- 25.
⦁ What is the permit fee for an electrical sign 3x4 ft double sided sign?
- A.
Review fee $80 plus $1.20 per Sq. Ft. (Over 200 square.ft.)
- B.
Review fee $20 plus $1.00 per Sq. Ft. (Over 100 square.ft.)
- C.
Review fee $40 plus $1.50 per Sq. Ft. (Over 100 square.ft.)
- D.
Review fee $600 plus $1.50 per Sq. Ft. (Over 100 square.ft.)
Correct Answer
C. Review fee $40 plus $1.50 per Sq. Ft. (Over 100 square.ft.)Explanation
The correct answer is the first option, "Review fee $40 plus $1.50 per Sq. Ft. (Over 100 square.ft.)". This option states that there is a review fee of $40, and an additional charge of $1.50 per square foot for any area over 100 square feet. Since the electrical sign in question is 3x4 ft, which equals 12 square feet, it falls under the category of "Over 100 square.ft." and therefore incurs the additional charge. The other options either have different review fees or different charges for square footage, making them incorrect.Rate this question:
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- 26.
⦁ What is the minimum distance from ground to sign over the public right away?
- A.
9’ high and 8” from the curb line
- B.
9’ high and 12” from the curb line
- C.
9’ high and 10” from the curb line
- D.
9’ high and 16” from the curb line
Correct Answer
B. 9’ high and 12” from the curb lineExplanation
The minimum distance from the ground to the sign over the public right away is 9' high and 12" from the curb line. This means that the bottom of the sign should be at least 9 feet above the ground, and it should be positioned 12 inches away from the curb line. This ensures that the sign is at a safe height and distance from the road, allowing for visibility and avoiding any potential obstructions or hazards.Rate this question:
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- 27.
⦁ What is the distance a disconnect can be located from the equipment in which it serves?
- A.
No more than 20’ (Within Sight)
- B.
No more than 50’ (Within Sight)
- C.
No more than 100’ (Within Sight)
- D.
No more than 80’ (Within Sight)
Correct Answer
B. No more than 50’ (Within Sight)Explanation
The correct answer is "No more than 50' (Within Sight)" because according to electrical safety standards, a disconnect should be located within sight of the equipment it serves. This ensures that the disconnect can be easily accessed and operated in case of an emergency or maintenance. Placing the disconnect within 50 feet of the equipment allows for quick response and minimizes the risk of accidents or delays in shutting off the power supply.Rate this question:
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- 28.
⦁ If the GC pulls the permit, who signs the electrical permit?
- A.
GC pulls a building permit and EC submits the electrical permit under the building permit.
- B.
EC pulls a building permit.
- C.
Mechanical pulls a building permit and EC submits the electrical permit under the building permit.
- D.
Plumbing pulls a building permit and EC submits the electrical permit under the building permit.
Correct Answer
A. GC pulls a building permit and EC submits the electrical permit under the building permit.Explanation
In this scenario, the General Contractor (GC) is responsible for pulling the building permit. Once the building permit is obtained, the Electrical Contractor (EC) submits the electrical permit under the building permit. This means that the EC does not pull the building permit themselves, but rather submits the electrical permit as part of the overall building permit obtained by the GC.Rate this question:
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- 29.
⦁ What to do when live wires are found?
- A.
Fix it immediately.
- B.
Contact the General Contractor
- C.
Contact the owner.
- D.
Contact an immediate supervisor.
Correct Answer
D. Contact an immediate supervisor.Explanation
When live wires are found, it is important to contact an immediate supervisor. This is because the supervisor is responsible for managing the safety of the work environment and will have the knowledge and authority to handle the situation appropriately. They can take the necessary steps to ensure the safety of everyone involved, such as calling in a qualified electrician to fix the issue or shutting off power to the area if needed. Contacting the immediate supervisor is the most efficient and effective way to address the presence of live wires.Rate this question:
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- 30.
⦁ Who has the authority to interpret code?
- A.
Supervising Electrician
- B.
AHJ (Building Commissioner)
- C.
The owner
- D.
Inspector
Correct Answer
B. AHJ (Building Commissioner)Explanation
The AHJ (Building Commissioner) has the authority to interpret code because they are responsible for enforcing building codes and regulations. They have the knowledge and expertise to understand and interpret the codes and ensure that they are followed correctly. The AHJ is typically a government official or agency that is responsible for ensuring the safety and compliance of buildings and construction projects.Rate this question:
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- 31.
⦁ Who may grant special permission on code?
- A.
The owner
- B.
Supervising Electrician
- C.
Inspector
- D.
AHJ (Building Commissioner)
Correct Answer
D. AHJ (Building Commissioner)Explanation
The AHJ (Building Commissioner) may grant special permission on code. The AHJ, or Authority Having Jurisdiction, is responsible for enforcing building codes and regulations. They have the authority to approve exceptions or modifications to the code if it is deemed necessary or appropriate. The Supervising Electrician, owner, and inspector may have input or recommendations, but the final decision lies with the AHJ.Rate this question:
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- 32.
⦁ Who pulls the electrical permit during the permit process?
- A.
Electrical Contractor
- B.
The owner
- C.
Supervising Electrician
- D.
Project Manager
Correct Answer
A. Electrical ContractorExplanation
During the permit process, the electrical contractor is responsible for pulling the electrical permit. They are the ones who are licensed and qualified to perform electrical work, and therefore have the authority to obtain the necessary permits for the job. The electrical contractor is typically hired by the owner or project manager to oversee and carry out the electrical work, ensuring that it is done in compliance with the applicable regulations and safety standards.Rate this question:
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- 33.
⦁ Who's a Qualified person?
- A.
Electrical Contractor
- B.
One who is under the direct supervision of a supervising electrician.
- C.
Supervising Electrician
- D.
Inspector
Correct Answer
B. One who is under the direct supervision of a supervising electrician.Explanation
A qualified person is someone who is under the direct supervision of a supervising electrician. This means that the person has the necessary skills and knowledge to work in the field of electrical contracting, but they are still being overseen and guided by a more experienced electrician. This ensures that the work being done is safe and meets the necessary standards.Rate this question:
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- 34.
⦁ Supervising Electrician?
- A.
One who is under the direct supervision of a supervising electrician.
- B.
General Contractor
- C.
Inspector
- D.
A person registered pursuant to Chapter 4-292
Correct Answer
D. A person registered pursuant to Chapter 4-292Explanation
The correct answer is "A person registered pursuant to Chapter 4-292." This means that a supervising electrician is someone who has registered and meets the requirements set forth in Chapter 4-292. This could include having the necessary qualifications, certifications, and experience to supervise electrical work.Rate this question:
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- 35.
⦁ Conductive Optical Fiber Cable?
- A.
One who is under the direct supervision of a supervising electrician.
- B.
Supervising Electrician
- C.
Factory assembly of one or more fibers having an overall covering and containing noncurrent carrying conductive members such a strength members metallic barriers metallic armor or metallic sheath.
- D.
A person registered pursuant to Chapter 4-292
Correct Answer
C. Factory assembly of one or more fibers having an overall covering and containing noncurrent carrying conductive members such a strength members metallic barriers metallic armor or metallic sheath.Explanation
The correct answer is "Factory assembly of one or more fibers having an overall covering and containing noncurrent carrying conductive members such a strength members metallic barriers metallic armor or metallic sheath." This answer accurately describes a conductive optical fiber cable as a cable that is assembled in a factory and contains fibers with a covering, as well as noncurrent carrying conductive elements such as metallic barriers, armor, or sheath.Rate this question:
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- 36.
⦁ What items are considered to be Premise wiring?
- A.
Interior and exterior power, lighting, control, and signal circuit wiring with all fittings installed.
- B.
Interior conductors, raceways and equipment.
- C.
Interior and exterior power, lighting, control, and signal circuit wiring with all fittings, devices both permanent and temporary installed.
- D.
Exterior conductors, raceways, and equipment.
Correct Answer
C. Interior and exterior power, lighting, control, and signal circuit wiring with all fittings, devices both permanent and temporary installed.Explanation
Premise wiring refers to the wiring that is installed within a building or facility to provide power, lighting, control, and signal circuit connections. It includes both interior and exterior wiring, and it encompasses all the necessary fittings, devices, and equipment that are permanently or temporarily installed to support these connections. This answer accurately describes the various components and installations that are considered to be part of premise wiring.Rate this question:
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- 37.
⦁ Abandoned Electrical Equipment shall be?
- A.
Saved and reused for later.
- B.
Cut & capped only.
- C.
Turned over to the owner.
- D.
All accessible raceways, cables, conductors, boxes and equipment shall be removed.
Correct Answer
D. All accessible raceways, cables, conductors, boxes and equipment shall be removed.Explanation
All accessible raceways, cables, conductors, boxes, and equipment should be removed when dealing with abandoned electrical equipment. This ensures that no live wires or potential hazards are left behind, promoting safety and preventing any accidents or damage that may occur if the equipment is left in place. Removing all the components also allows for a clean and organized workspace for future electrical work.Rate this question:
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- 38.
⦁ 4-Wire delta connected system of one phase is winding is grounded
- A.
The high leg shall be Brown.
- B.
The high leg shall be Black.
- C.
The high leg shall be Yellow.
- D.
The high leg shall be Orange.
Correct Answer
D. The high leg shall be Orange.Explanation
In a 4-wire delta connected system, one phase winding is grounded. The high leg refers to the phase with the highest voltage to ground. In this case, the high leg is specified to be Orange.Rate this question:
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- 39.
⦁ Exposed live parts 600Vs on one side and no live ground parts on the other side of working space?
- A.
5'
- B.
3'
- C.
3'-6"
- D.
4'
Correct Answer
B. 3'Explanation
In this setup, live parts of 600 volts or less are positioned on one side, while no live ground parts are present on the other side of the working space, typically requiring a clearance of 3 feet.Rate this question:
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- 40.
⦁ Which covers both NEMA 6 and 6P?
- A.
Sleet
- B.
Wind blown dust
- C.
Rain, Snow and Sleet
- D.
Hose down
Correct Answer
C. Rain, Snow and SleetExplanation
The option "Rain, Snow and Sleet" covers both NEMA 6 and 6P standards. These standards ensure protection against harsh environmental conditions such as rain, snow, and sleet. NEMA 6P extends the protection to include temporary submersion, making it suitable for more demanding outdoor and industrial applications.Rate this question:
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- 41.
⦁ Color of grounded conductor 150V or less?
- A.
Yellow
- B.
White
- C.
Grey
- D.
Green
Correct Answer
B. WhiteExplanation
In electrical wiring, the color white is typically used for the grounded conductor with a voltage of 150V or less. This is a standard practice to ensure safety and consistency in electrical installations. The grounded conductor, also known as the neutral conductor, carries the return current from the load back to the power source. By using the color white for this conductor, it helps electricians and technicians easily identify and differentiate it from other conductors in the circuit.Rate this question:
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- 42.
⦁ No grounded conductor shall be attached to any terminal or lead so as to reverse the designated polarity?
- A.
True
- B.
False
Correct Answer
A. TrueExplanation
This statement is true because attaching a grounded conductor to a terminal or lead in a way that reverses the designated polarity can cause electrical hazards and damage to the equipment. The grounded conductor is intended to provide a safe path for electrical current in the event of a fault, and reversing the polarity can disrupt this path and potentially create a dangerous situation. Therefore, it is important to adhere to the proper polarity when connecting grounded conductors to terminals or leads.Rate this question:
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- 43.
⦁ Arch-Fault Circuit Breakers are required in
- A.
Dwelling Units, Dormitory, Guest and Guest Suites
- B.
Class I locations.
- C.
Hotels, dormitories, and commercial spaces
- D.
Hotels
Correct Answer
A. Dwelling Units, Dormitory, Guest and Guest SuitesExplanation
Arch-Fault Circuit Breakers are required in Dwelling Units, Dormitory, Guest and Guest Suites. This means that in residential buildings such as houses, apartments, and other living spaces, as well as in dormitories and guest rooms, Arch-Fault Circuit Breakers are necessary. These circuit breakers are designed to detect and prevent dangerous electrical arcs that can cause fires, making them essential for ensuring the safety of occupants in these types of locations.Rate this question:
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- 44.
⦁ Receptacles shall not be spaced further than
- A.
10'
- B.
6'
- C.
12'
- D.
6"
Correct Answer
C. 12'Explanation
Receptacles in a typical household or commercial electrical system should not be spaced further than 12 feet apart along the wall so no point in wall is more than 6 feet away from an outlet. This spacing helps ensure that electrical appliances and devices can be conveniently plugged in and used without the need for excessive extension cords.Rate this question:
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- 45.
⦁ Are dedicated neutrals required?
- A.
True
- B.
False
Correct Answer
B. FalseExplanation
The question asks if dedicated neutrals are required. The correct answer is "False" because dedicated neutrals are not required in all situations. Dedicated neutrals are typically used in electrical systems to provide a separate path for the return current. However, in some cases, shared neutrals can be used, where multiple circuits share the same neutral conductor. Therefore, dedicated neutrals are not always necessary.Rate this question:
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- 46.
⦁ Plan’s are required for
- A.
Dwelling occupancies in buildings less than two stories in height
- B.
New or replacement services or feeders rated 400A or greater
- C.
Both are correct
- D.
None of the above
Correct Answer
B. New or replacement services or feeders rated 400A or greaterExplanation
Plans are required for new or replacement services or feeders rated 400A or greater. This means that any time a new electrical service or feeder is being installed, or an existing one is being replaced, and it is rated at 400A or higher, plans must be submitted. This ensures that the installation is done correctly and safely, as higher ampere ratings can pose greater risks if not properly handled. Plans help in documenting the design and layout of the electrical system, ensuring compliance with regulations and facilitating effective communication between contractors and inspectors.Rate this question:
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- 47.
⦁ Maximum voltage drop for feeder & branch?
- A.
5%
- B.
3%
- C.
10%
- D.
None of the above
Correct Answer
A. 5%Explanation
The maximum voltage drop for a feeder and branch is 5%. This means that the voltage should not drop more than 5% from the source voltage to the end of the feeder or branch. This is important to ensure that the electrical devices connected to the feeder or branch receive the required voltage for proper operation. A higher voltage drop can lead to decreased efficiency and performance of the devices.Rate this question:
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- 48.
⦁ Sized not to exceed voltage drop?
- A.
5%
- B.
3%
- C.
10%
- D.
None of the above
Correct Answer
B. 3%Explanation
The correct answer is 3%. This means that the size of the equipment or wire should be chosen in such a way that the voltage drop does not exceed 3%. Voltage drop refers to the decrease in voltage that occurs as electricity flows through a wire or conductor. By limiting the voltage drop to 3%, the efficiency of the electrical system can be maintained, ensuring that the intended voltage reaches the desired destination without significant loss.Rate this question:
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- 49.
⦁ What is the Lighting Load for a retail store?
- A.
2VA ft. squared
- B.
1/2VA ft. squared
- C.
1VA ft. squared
- D.
3VA ft. squared
Correct Answer
D. 3VA ft. squaredExplanation
The correct answer is 3VA ft. squared. The lighting load for a retail store is typically measured in volt-amperes (VA) per square foot (ft. squared). This measurement is used to determine the electrical power required for lighting fixtures in the store. A higher VA per ft. squared value indicates a higher lighting load, meaning more electrical power is needed to adequately light the store. Therefore, 3VA ft. squared would indicate a higher lighting load compared to the other options provided.Rate this question:
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- 50.
⦁ How many breakers required for 14 600VA 120V medium based socket lamps?
- A.
5
- B.
6
- C.
7
- D.
8
Correct Answer
A. 5Explanation
To determine the number of breakers required for 14 lamps with a power rating of 600VA each at 120V, we need to calculate the total power consumption and then divide by the maximum power capacity of each breaker.
Total power consumption = Number of lamps × Power rating per lamp Total power consumption = 14 lamps × 600VA per lamp = 8400VA
Now, we need to determine the number of breakers required. Assuming a standard 15A breaker:
Maximum power capacity of each breaker = 15A × 120V = 1800VA
Number of breakers required = Total power consumption / Maximum power capacity of each breaker Number of breakers required = 8400VA / 1800VA ≈ 4.67
Since breakers cannot be fractionally divided, we round up to the nearest whole number.
Therefore, the number of breakers required would be 5.Rate this question:
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Nov 25, 2024Quiz Edited by
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Apr 17, 2020Quiz Created by
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