Motors Book - Chapter 3

15 Questions | Total Attempts: 316

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Motors Book Quizzes & Trivia

Questions and Answers
  • 1. 
    The rotor in a AC alternator may also be called a(n) ___, even though the term "rotor" is more correct.
    • A. 

      Drum switch

    • B. 

      Brush

    • C. 

      Stator

    • D. 

      Armature

  • 2. 
    The most common alternator design consists of a stator in which the potential is induced by the rotating field supplied by the ___.
    • A. 

      3-phase source

    • B. 

      Exciter generator

    • C. 

      Slip rings

    • D. 

      Brushes

  • 3. 
    In a common alternator design, ___ is applied to the rotor to move the rotor windings and their magnetic fields past the stator windings.
    • A. 

      Torque

    • B. 

      Electromagnetism

    • C. 

      Voltage

    • D. 

      Current

  • 4. 
    A(n) ___ alternator is an alternator where a magnetic field is created in the rotor, which turns within the fixed stator windings, and AC power is supplied through the stator windings.
    • A. 

      Excitor

    • B. 

      Revolving-rotor

    • C. 

      Revolving-field

    • D. 

      All of the above

  • 5. 
    A factor controlling the output voltage of an alternator is the ___.
    • A. 

      Length of wire

    • B. 

      Speed of the rotor

    • C. 

      Strength of the magnetic field

    • D. 

      All of the above

  • 6. 
    A(n) ___ is used to control the main alternator voltage.
    • A. 

      Voltage rating

    • B. 

      Voltage regulator

    • C. 

      Enclosure

    • D. 

      Magnetic field

  • 7. 
    A ___ alternator consists of a stationary magnet and a single winding that is rotated in the field.
    • A. 

      Single-phase AC

    • B. 

      Single-phase DC

    • C. 

      Three-phase AC

    • D. 

      Three-phase DC

  • 8. 
    A ___ is a power source used to create relative motion between a coil and a magnetic field.
    • A. 

      Solid-state starter

    • B. 

      Manual starter

    • C. 

      Prime mover

    • D. 

      Commutator

  • 9. 
    Alternators are rated in ___ at a standard power factor of 80%
    • A. 

      Kilovolt amperes (kVA)

    • B. 

      Kilowatts (kW)

    • C. 

      Megawatts (MW)

    • D. 

      None of the above

  • 10. 
    Alternators are placed in parallel to ___.
    • A. 

      Carry added load when needed

    • B. 

      Enhance reliability by having multiple alternators in operation

    • C. 

      Provide power during maintenance of other alternators

    • D. 

      All of the above

  • 11. 
    A ___ can be used to help match the frequency and phase of an alternator to the busbar, or to match two alternators
    • A. 

      Synchroscope

    • B. 

      Synchronous speed monitor

    • C. 

      Power load meter

    • D. 

      Slip ring

  • 12. 
    A(n) ___ energizes a relay and closes a contact when the incoming source and the busbar match.
    • A. 

      Autotransformer starter

    • B. 

      Automatic synchronizer

    • C. 

      Field winding

    • D. 

      All of the above

  • 13. 
    A ___ is the fixed unmoving part of a generator, consisting of a core and windings, that converts the energy of a magnetic field to electrical energy.
    • A. 

      Brush

    • B. 

      Rotor

    • C. 

      Stator

    • D. 

      Generator

  • 14. 
    A(n) ___ generator is an assembly consisting of a small three-phase alternator used to supply current to an alternator rotor.
    • A. 

      Revolving-rotor

    • B. 

      Revolving-field

    • C. 

      Brushless

    • D. 

      Exciter

  • 15. 
    ___ is turning or twisting force that causes an object to rotate.
    • A. 

      Electromagnetism

    • B. 

      Magnetism

    • C. 

      Torque

    • D. 

      Friction

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