Motors Book - Chapter 4

15 Questions | Total Attempts: 78

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Motors Book Quizzes & Trivia

Questions and Answers
  • 1. 
    A ___ motor transfer energy from electric power to the load through the use of a rotating magnetic field.
    • A. 

      Design

    • B. 

      Single-phase

    • C. 

      3-phase

    • D. 

      DC

  • 2. 
    A ___ is the fixed, unmoving part of motor, consisting of a core and windings, that converts electrical energy to the energy of a magnetic field.
    • A. 

      Motor shaft

    • B. 

      Drum switch

    • C. 

      Cartridge fuse

    • D. 

      Stator

  • 3. 
    The most common types of rotors are used in squirrel-cage induction motors, ___ motors, and synchronous motors.
    • A. 

      Wound-rotor

    • B. 

      Open

    • C. 

      Salient

    • D. 

      Flux

  • 4. 
    As the rotor begins to move, the frequency of the induced current in the rotor decreases, until the rotor approaches synchronous speed, where the rotor frequency approaches ___ Hz.
    • A. 

      0

    • B. 

      50

    • C. 

      60

    • D. 

      120

  • 5. 
    A single-___ motor is a motor that operates at only one voltage level.
    • A. 

      Design

    • B. 

      Voltage

    • C. 

      Stator

    • D. 

      Torque

  • 6. 
    In a ___ motor, one end of each of the three phase windings is internally connected to the other phase windings.
    • A. 

      Single-voltage, delta connected

    • B. 

      Dual-voltage, wye connected, three-phase

    • C. 

      Wye connected, single-phase

    • D. 

      Wye connected, 3-phase

  • 7. 
    In a ___ motor, each phase is wired end-to-end to form a completely closed circuit.
    • A. 

      Single-voltage, wye connected, three-phase

    • B. 

      Dual-voltage, wye connected, three-phase

    • C. 

      Delta-connected, 3-phase

    • D. 

      Delta-connected, single-phase

  • 8. 
    A typical dual-voltage, 3-phase motor rating is ___V.
    • A. 

      230/460

    • B. 

      240/480

    • C. 

      208-230/460

    • D. 

      All of the above

  • 9. 
    The common types of torque related to motors are locked-rotor torque and ___ torque.
    • A. 

      Full-load

    • B. 

      Pull-up

    • C. 

      Breakdown

    • D. 

      All of the above

  • 10. 
    ___ power is the product of the total current and voltage in a circuit.
    • A. 

      Reactive

    • B. 

      Apparent

    • C. 

      True

    • D. 

      Motor

  • 11. 
    ___ loss is the total energy loss in the stator and rotor cores due to circulating currents and to the magnetic field escaping from the core.
    • A. 

      Resistance

    • B. 

      Core

    • C. 

      Bearing

    • D. 

      Hysteresis

  • 12. 
    A ___ is a motor component used to reduce friction and maintain clearance between the stationary parts and the moving shaft.
    • A. 

      Bearing

    • B. 

      Motor shaft

    • C. 

      Fuse

    • D. 

      Eutectic alloy

  • 13. 
    The motor ___ indicates whether a motor is rated to operate at 50 Hz, 60 Hz, or both.
    • A. 

      Label

    • B. 

      Identification tag

    • C. 

      Nameplate

    • D. 

      Load

  • 14. 
    Motors for ___ loads are designed to give the same maximum torque at all speeds.
    • A. 

      Variable-horsepower

    • B. 

      Variable-torque

    • C. 

      Constant-horsepower

    • D. 

      Constant-torque

  • 15. 
    ___ loss is the loss of flux in the air gap because the air gap has increased reluctance compared to the cores.
    • A. 

      Bearing

    • B. 

      Flux-linkage

    • C. 

      Windage

    • D. 

      Sound

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