PCI 264 Take Home Quiz-motors

20 Questions | Total Attempts: 185

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PCI 264 Take Home Quiz-motors - Quiz

Many moving devices are made possible through the use of motors. These are machines that convert electrical energy into mechanical energy. The quiz below tests how much information and knowledge you have on the subject.


Questions and Answers
  • 1. 
    It is possible for CEMF to be produced if the armature is not turning.
    • A. 

      True

    • B. 

      False

  • 2. 
    The direction of rotation by the shaft of a universal motor can be changed by reversing the AC power leads.
    • A. 

      True

    • B. 

      False

  • 3. 
    The direction of the wound rotor induction motor can be reversed by interchanging two of the three rotor terminals.
    • A. 

      True

    • B. 

      False

  • 4. 
    Interchanging the rotor leads of a wound rotor motor reverses the direction of the motor.
    • A. 

      True

    • B. 

      False

  • 5. 
    BDCMs have low maintenance requirements because they do not have brushes.
    • A. 

      True

    • B. 

      False

  • 6. 
    In the shading coil of the shaded-pole motor, the direction of the induced current_______the change in magnetic field that induced it.
    • A. 

      Aids

    • B. 

      Opposes

  • 7. 
    When the DC excitation increases to cause an over-excited synchronous motor, a_________is developed.
    • A. 

      Lagging power factor

    • B. 

      Leading power factor

    • C. 

      Unity power factor

    • D. 

      None of the above

  • 8. 
    Which winding of a split-phase motor has the largest inductance?
    • A. 

      Start

    • B. 

      Run

  • 9. 
    The speed of a moving coil motor (MCM) is varied by _______.
    • A. 

      Changing the DC voltage applied to the armature

    • B. 

      Changing the width of DC pulses applied to the armature

  • 10. 
    If the sequence in which the stator poles are magnetized moves in a CCW direction, the rotor direction of a VR stepper motor will be_______.
    • A. 

      Clockwise

    • B. 

      Counterclockwise

  • 11. 
    The ________-hand rule is used to describe the direction of motion in a motor.
  • 12. 
    The armature is placed inside the__________field.
  • 13. 
    Motors that operate by using AC or DC power are called __________motors.
  • 14. 
    When a WRIM is started, the ohm setting of the resistor network is _________, and the torque is maximum because____________________________________________.
  • 15. 
    Suppose that the rotating speed of the magnetic field in the stator of an induction motor is 2,700 rpm. If the rotor speed is 2,670, the difference in speed between these two rpm values is called_______, and is measured in _________, of which the value is ______%.
  • 16. 
    How much work does a DC motor accomplish when it moves a 400-pound weight a distance of 20 feet?
  • 17. 
    A 4,000-pound sack of grain is lifted to a height of 25 feet in 45 seconds. How many horsepower of work is performed?
  • 18. 
    Find the armature current of a shunt motor with an armature resistance of 6ohms and 120 volts applied. Then find the amount of torque produced if the motor has a Kt rating of 1 and a field flux of 2.
  • 19. 
    How much power in watts is consumed to move a 30-pound sack 100 feet in 2 seconds?
  • 20. 
    Find the armature current of a series DC motor with an armature resistance of 7 ohms and a field coil resistance of 15 ohms when 220 volts are applied.
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