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Building Electrical Systems Quiz - Branch Circuits
40 Questions
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Building Electrical Systems Quiz - Branch Circuits

Created by
@FunnyPegasus

Questions and Answers

What is the primary function of a return wire in an electrical circuit?

  • To short-circuit the electrical devices
  • To supply additional voltage to the circuit
  • To increase the overall resistance of the circuit
  • To complete the current path back to the source (correct)

    • In a series circuit, what happens to the current when additional resistive components are added?

  • The current increases
  • The current decreases (correct)
  • The current remains the same
  • The current fluctuates irregularly

    • How is total resistance calculated in a series circuit?

  • By subtracting the smallest resistance from the largest
  • By multiplying all resistances together
  • By adding all individual resistances (correct)
  • By taking the average of the resistances

    • What distinguishes a parallel circuit from a series circuit?

    <p>All components share the same voltage in parallel circuits</p> Signup and view all the answers

    Which characteristic of the current in a parallel circuit is true?

    <p>The total current equals the sum of the currents through each branch</p> Signup and view all the answers

    What is represented by the dials calibrated in kilowatt-hours?

    <p>The total energy consumption over time</p> Signup and view all the answers

    In a series circuit with resistors of 10 ohms each, what is the total resistance if five resistors are used?

    <p>50 ohms</p> Signup and view all the answers

    Which of the following best describes the function of a live wire in a two-wire circuit?

    <p>It carries the current to the load</p> Signup and view all the answers

    What is the primary function of a feeder circuit?

    <p>To extend from the main switchboard to a distributing center without other connections</p> Signup and view all the answers

    How do sub-feeder circuits differ from feeder circuits?

    <p>Sub-feeders serve to distribute power from main feeders to sub-panel boards</p> Signup and view all the answers

    What is the role of a panel board in an electrical system?

    <p>To control and protect sub feeders and branch circuits</p> Signup and view all the answers

    Which of the following correctly describes branch circuits?

    <p>They deliver energy to lamps, motors, and other loads within a circuit</p> Signup and view all the answers

    What device is described as the main disconnect for an entire electrical system?

    <p>Service switch</p> Signup and view all the answers

    What is the primary function of a fuse in an electrical system?

    <p>To interrupt the circuit by melting and stopping excess current</p> Signup and view all the answers

    What does a circuit breaker do in an electrical system?

    <p>It automatically interrupts a circuit to protect from excess current</p> Signup and view all the answers

    What is the common term for a heavy conductor used for collecting and distributing large electric currents?

    <p>Bus</p> Signup and view all the answers

    What defines a general purpose circuit?

    <p>It can supply current to multiple outlets for lighting and appliances.</p> Signup and view all the answers

    What is the primary function of a distribution panel?

    <p>To distribute power and protect branch circuits in an electrical system.</p> Signup and view all the answers

    Which statement correctly describes an appliance circuit?

    <p>It is specifically designed for one or more outlets catering to appliances.</p> Signup and view all the answers

    What is meant by individual circuit?

    <p>A circuit dedicated to a single appliance or equipment.</p> Signup and view all the answers

    What is the voltage characteristic of low-voltage circuits?

    <p>They generally supply below 50 volts.</p> Signup and view all the answers

    Which characteristic is true of a branch circuit?

    <p>It extends from the final overcurrent device to the outlets served.</p> Signup and view all the answers

    Which type of circuit is usually utilized for doorbells and remote lighting?

    <p>Low-voltage circuit.</p> Signup and view all the answers

    What type of circuit would be defined as a branch circuit supplying multiple outlets for use?

    <p>General purpose circuit.</p> Signup and view all the answers

    What is the primary function of momentary contact switches?

    <p>To connect or cut-off a circuit for a short duration</p> Signup and view all the answers

    What type of switch is known for regulating light intensity?

    <p>Dimmer switch</p> Signup and view all the answers

    Which of the following switches can be controlled remotely?

    <p>Remote control switch</p> Signup and view all the answers

    What distinguishes a double throw switch from a single throw switch?

    <p>It can make a closed circuit in two positions.</p> Signup and view all the answers

    What type of switch operates based on the presence of a liquid conductor?

    <p>Float switch</p> Signup and view all the answers

    Which switch type uses a sealed glass tube of mercury to operate?

    <p>Mercury switch</p> Signup and view all the answers

    What is the function of an Automatic Transfer Switch (ATS)?

    <p>To switch between power sources automatically</p> Signup and view all the answers

    Which of the following describes a key switch?

    <p>Requires a key or card to operate</p> Signup and view all the answers

    What is required for emergency lighting to ensure no area is left in total darkness?

    <p>The failure of any individual lighting element should not leave any area in total darkness.</p> Signup and view all the answers

    How should branch circuits supplying emergency lighting be designed?

    <p>They should provide immediate service upon normal supply interruption.</p> Signup and view all the answers

    Which setup is NOT permitted for emergency circuit wiring?

    <p>Combining emergency circuit wiring with general lighting wiring.</p> Signup and view all the answers

    What must happen upon the failure of the normal power supply for emergency equipment?

    <p>The load must transfer to an emergency supply source automatically.</p> Signup and view all the answers

    In terms of emergency lighting switches, what arrangement is prohibited?

    <p>Three-way switches in the emergency circuit.</p> Signup and view all the answers

    How many complete systems are needed when providing emergency lighting?

    <p>Two or more independent systems are recommended.</p> Signup and view all the answers

    What is the purpose of switches in emergency lighting circuits?

    <p>To enable only authorized personnel to disconnect the emergency lights.</p> Signup and view all the answers

    Which of the following is a requirement for emergency lighting systems during normal supply failure?

    <p>They should automatically energize from an independent source.</p> Signup and view all the answers

    Study Notes

    Building Electrical Systems

    • Electrical circuits consist of a complete path for current, involving a source and a load device.
    • Two-wire circuits include a live wire (delivers current) and a neutral wire (returns current).

    Types of Circuits

    • Series Circuit: Components connected in tandem; all loads carry the same current. Total resistance (R) is the sum of individual resistances (R = R1 + R2 + R3 + R4 + R5).
    • Parallel Circuit: Components arranged so that current divides between them; allows for independent operation.

    Circuit Classifications

    • Branch Circuit: Extends from the last overcurrent device to the outlets; powers lights and appliances.
    • General Purpose Circuit: Supplies multiple outlets for lighting and appliances.
    • Appliance Circuit: Specifically serves one or more outlets for appliances.
    • Individual Circuit: Dedicated to a single piece of equipment.

    Distribution Components

    • Distribution Panel: Distributes power, controls, protects branch circuits.
    • Low-Voltage Circuit: Alternating current below 50 volts used for devices like doorbells and lighting.
    • Feeder Circuits: Conductors extending from the main switchboard to a panel board.
    • Sub-Feeder Circuits: Extensions serving smaller local panel boards from main feeders.

    Protection Devices

    • Fuse: Melts to interrupt circuit under excess current.
    • Service Switch: Main disconnect for building’s electrical system, excluding emergency systems.
    • Panel: Houses switches, fuses, and circuit breakers for branch circuits.

    Switch Types

    • Toggle Switch: Engages or disengages a circuit with a lever.
    • Momentary Contact Switch: Connects/cuts off a circuit temporarily.
    • Dimmer Switch: Regulates light intensity without affecting distribution.

    Special Switches

    • Time Controlled Switch: Operates based on a timer mechanism.
    • Remote Control Switches: Operated wirelessly from a distance.
    • Air Switch: Uses air interruption to open/close circuits.
    • Mercury Switch: Operates via a mercury-filled tube.
    • Automatic Transfer Switch (ATS): Automatic switch to transfer power during outages.

    Emergency Lighting Systems

    • Must ensure no area is left in total darkness; designed for immediate service during normal supply failure.
    • Can be independent systems or dual systems providing current for emergencies.
    • Emergency circuit wiring must remain independent from other wiring.
    • Switch access should be restricted to authorized personnel; specific configurations allowed for emergency activation.

    Regulatory Requirements

    • Emergency lighting must be automatically energized upon failure of the normal supply.
    • Switches used in emergency circuits must ensure control is limited to authorized individuals for safety.

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    Description

    Test your knowledge on building electrical systems with a focus on branch circuits. This quiz covers the fundamentals of electrical circuits, including how they function and their components. Enhance your understanding of kilowatt-hours and electrical paths.

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