Electrical Engineering Review Quiz
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Questions and Answers

What is the effect of using a divertor across a series field?

  • Adjusts the degree of compounding (correct)
  • Decreases efficiency
  • Reduces power factor
  • Increases output voltage

    • What does the term 'inductively and conductively' refer to in energy transfer?

  • Only inductive energy transfer
  • A combination of inductive and conductive methods (correct)
  • Only conductive energy transfer
  • Energy transfer loss

    • In what scenario is the percentage carrier power increased?

  • When the amplitude of the carrier is increased (correct)
  • When voltage transformation ratio is low
  • When the phase angle is minimized
  • When the signal amplitude decreases

    • What is a function of a 'synchronous motor'?

    <p>Maintains a constant speed with varying load (C)</p> Signup and view all the answers

    What is the purpose of mechanical braking?

    <p>To slow down or stop a moving machine (B)</p> Signup and view all the answers

    What is the primary characteristic of a synchronous motor?

    <p>It maintains constant speed with varying load. (D)</p> Signup and view all the answers

    What type of motor would be unsuitable for heavy duty starting?

    <p>Squirrel cage induction motor (D)</p> Signup and view all the answers

    Which motor type is typically associated with high starting torque?

    <p>Repulsion motor (D)</p> Signup and view all the answers

    What is the primary function of commutator bars in a motor?

    <p>To convert AC to DC. (A)</p> Signup and view all the answers

    What voltage type do silicon diodes primarily operate with?

    <p>Only DC voltages (C)</p> Signup and view all the answers

    What is the primary role of inductance in electrical circuits?

    <p>To store energy in the form of a magnetic field. (D)</p> Signup and view all the answers

    What typically causes sparking in electrical motors?

    <p>Brush and commutator contact issues (B)</p> Signup and view all the answers

    Which motor type is efficient for use in lifts and hoists?

    <p>Permanent-magnet type motor (D)</p> Signup and view all the answers

    Flashcards

    Synchronous Motor

    An electrical machine that operates at constant speed regardless of load.

    Slip Ring Induction Motor

    An induction motor which uses slip rings for rotor connection, allowing variable speed.

    Commutator Bars

    Conductive metal bars in a DC motor that switch current direction in the rotor.

    Transformers Loss

    Power losses in a transformer that depend on volt-ampere rating.

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    DC Motor

    A motor powered by direct current, converting electrical energy to mechanical energy.

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    High Starting Torque

    The initial force needed to start a motor, significant for heavy loads.

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    Armature Current

    The current flowing through the armature winding of a motor, fundamental for operation.

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    Inductive Impedance

    Opposition to current flow in an inductor, dependent on frequency and inductance.

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    Voltage Transformation Ratio

    The ratio at which voltage increases or decreases in a transformer.

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    Inductive and Conductive Energy Transfer

    Transfer of energy through magnetic fields (inductive) and direct contact (conductive).

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    Carrier Amplitude Change

    A method where the amplitude of a carrier wave is altered to convey information.

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    Fixed Loss

    A constant loss in proportion to the output produced by a system.

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    Safety Valve Function

    A component that prevents damage by releasing excess pressure or current.

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    Study Notes

    Electrical Engineering Review

    • Transformer Losses: Total transformer loss depends on volt-ampere.
    • Commutator Bars: A closed commutator has twice the commutator bars per pole.
    • Full-Pitch Winding: A full-pitch winding has twice the commutator bars.
    • Induced EMF Addition: Ensure the addition of induced electromotive forces (EMFs) of consecutive turns.
    • AC to DC Conversion: Methods convert alternating current (AC) to direct current (DC).
    • Waveform Characteristics: High and low waveforms.
    • Load Dependent: Magnitude of the load and load flux determine the pole flux.
    • Pole Flux and Load: The load flux in a synchronous motor establishes a constant pole flux.
    • Armature Current: Armature current in DC machines is clockwise.
    • Cross-magnetizing Flux: Neutralizing cross-magnetizing flux.
    • Various Configurations: 270° field configuration of several types.
    • Building a Structure: Structures can be built using certain physical properties.
    • Electrical System Properties: Series, parallel, and other configurations.
    • Compounding in Generators: Negative degree of compounding in generators.
    • Compensating for Losses: Methods to compensate for losses in power systems.
    • Copper Losses & Iron Losses: Copper loss is high compared to iron loss in a system.
    • Transformer Core Loss: Core loss in transformers.

    Types of Motors

    • Squirrel Cage Induction Motor: Squirrel cage induction motor.
    • Slip Ring Induction Motor: Slip ring induction motor.
    • Synchronous Motor: Synchronous motor.
    • Schrage Motor: Schrage motor type.
    • Ceiling Fan Motor: Ceiling fan motor.
    • High Power Factor Motors: High power factor motors.
    • Silicon Diode Application: Silicon diode application in motors.
    • Synchronous Motor: Also a type of synchronous motor.
    • DC Motors: Different types of DC motors.
    • AC Slip Ring Motor: An AC slip ring motor.

    Motor Characteristics

    • Starting Torque: High starting torque in AC slip ring motors.
    • Motor Types: AC slip ring motors, repulsion motors, and their duties.
    • Loading Conditions: Totally enclosed fan cooled, operating under various conditions and loads.
    • Motor Types Continued: permanent magnet type motors and other common configurations.
    • AC Motors (various): different properties of AC motors.
    • Applications (General Motors): Applications for various motor types.

    Electrical Concepts and Properties

    • Alternating Current (AC): Various characteristics of AC current and systems.
    • Direct Current (DC): Various characteristics of DC current and systems.
    • Amplitudes and Modulation: Relationship between amplitude, modulation and related properties.
    • Frequency and Signal Translation: Translate low frequency information through different means and processes.

    Additional Concepts

    • Impedance and Impedance Matching: Impedance matching and other important factors.
    • Carrier Power: Percentage carrier power is increased.

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    Description

    Test your knowledge on key concepts in electrical engineering, focusing on transformer losses, commutator bars, AC to DC conversion, and more. This quiz covers various configurations and essential principles that are crucial in understanding electrical machines and circuits.

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