Motors Book - Chapter 8

15 Questions | Total Attempts: 166

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Motors Book Quizzes & Trivia

Questions and Answers
  • 1. 
    In many cases, a single-phase motor is constructed with both a start and a ___ winding in the stator.
    • A. 

      Run

    • B. 

      Stop

    • C. 

      Shut-down

    • D. 

      None of the above

  • 2. 
    ___ is the lack of rotation when the stator's field and the rotor's field are parallel to one another.
    • A. 

      Parallel rotation

    • B. 

      Overload rating

    • C. 

      Non-adjustable-trip

    • D. 

      Locked in step

  • 3. 
    Shaded-pole motors are commonly ___ HP or less and have low starting torque.
    • A. 

      1/20

    • B. 

      1/2

    • C. 

      10

    • D. 

      100

  • 4. 
    The function of the ___ is to delay the magnetic flux in the area of the pole that is shaded.
    • A. 

      Salient pole

    • B. 

      Three-pole rheostat

    • C. 

      Shaded pole

    • D. 

      Pole-face windings

  • 5. 
    ___ control of shaded-pole motors is accomplished by adding windings in series with the main winding.
    • A. 

      Reverse speed

    • B. 

      Speed

    • C. 

      Magnetic

    • D. 

      Electromagnetic

  • 6. 
    ___ is the opposition to the flow of AC in a circuit due to inductance.
    • A. 

      Flux density

    • B. 

      Inductive reactance

    • C. 

      Hysteresis

    • D. 

      Magnetic flux

  • 7. 
    When the motor reaches approximately ___% of full speed, the centrifugal switch opens, disconnecting the start winding from the circuit.
    • A. 

      15

    • B. 

      45

    • C. 

      75

    • D. 

      95

  • 8. 
    The speed at which a split-phase motor runs is determined by the number of ___ in the motor and the frequency of the supply voltage.
    • A. 

      Poles

    • B. 

      Windings

    • C. 

      Rotors

    • D. 

      Brushes

  • 9. 
    A ___ motor is a single-phase motor with a capacitor connected in series with the start windings to produce phase displacement in the start winding.
    • A. 

      Wound-rotor

    • B. 

      Series

    • C. 

      Design

    • D. 

      Capacitor

  • 10. 
    A ___ motor has one-capacitor in series with the start winding and one capacitor in series with the run windings.
    • A. 

      Capacitor-run

    • B. 

      Capacitor start-and-run

    • C. 

      Shunt

    • D. 

      Single-phase

  • 11. 
    A ___ motor is commonly wound to run on either six or eight poles.
    • A. 

      Multispeed, single-phase

    • B. 

      Single-speed, split-phase

    • C. 

      Two-speed, split-phase

    • D. 

      Multispeed, three-phase

  • 12. 
    A capacitor-start motor operates much the same as a split-phase motor, in that it uses a centrifugal switch that opens at approximately ___% to ___% of full-load speed.
    • A. 

      20; 40

    • B. 

      40; 60

    • C. 

      60; 80

    • D. 

      80; 100

  • 13. 
    For a shaded-pole motor, the stator has two or more ___ poles that are divided into parts.
    • A. 

      Salient

    • B. 

      Shaded

    • C. 

      Rotor

    • D. 

      Magnetic

  • 14. 
    In a capacitor-run motor the addition of a second ___ creates a three-speed version of the motor.
    • A. 

      Soft starter

    • B. 

      Plug fuse

    • C. 

      Brush

    • D. 

      Auxiliary winding

  • 15. 
    Capacitor start-and-run motors are typically used to run ___ and ___.
    • A. 

      Fans; blowers

    • B. 

      Refrigerators; air compressors

    • C. 

      Air conditioners; power tools

    • D. 

      All of the above

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