PCI 264 Ch 8 Quiz- DC Drives

8 Questions | Total Attempts: 694

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Final Quiz~~PCI 264 Ch 8 Quiz- DC Drives ****Page 3 (9-16) are the only ones that did not involve drawing, therefore that is the only ones I could do on the quiz maker.


Questions and Answers
  • 1. 
    If the current applied to the armature of a shunt field type DC motor is constant and the current applied to the field coil is reduced, the motor speed will _______.
    • A. 

      Increase

    • B. 

      Decrease

    • C. 

      Stay the same

  • 2. 
    Which of the following types of DC motors are typically controlled by a DC drive?
    • A. 

      Permanent magnet

    • B. 

      Series

    • C. 

      Shunt

    • D. 

      Compound

    • E. 

      Both a and c

  • 3. 
    Varying the voltage from the drive to the field of a motor is used to control which of the following variables?
    • A. 

      The full speed range of the motor

    • B. 

      The velocity above the rated base speed of the motor

    • C. 

      Constant torque

    • D. 

      Acceleration and deceleration

  • 4. 
    The _________ feedback loop provides the most accurate signal for a DC drive.
    • A. 

      Internal

    • B. 

      External

  • 5. 
    The speed of a DC motor that requires a constant torque is controlled by adjusting the ________.
    • A. 

      Field current and keeping the armature voltage constant

    • B. 

      Armature voltage and keeping the field current constant

    • C. 

      Armature voltage and the field current

  • 6. 
    In an application where the horsepower required by the load is constant, if the speed of a DC motor is reduced, the torque is__________.
    • A. 

      Increased

    • B. 

      Decreased

  • 7. 
    The effective operation of punch presses, high inertia machines, pumps, and centrifugal fans require ____________load characteristics.
    • A. 

      Constant torque

    • B. 

      Constant horsepower

    • C. 

      Variable torque

  • 8. 
    Which of the following devices are not used as the operator control source for the DC drive?
    • A. 

      Switches and pushbuttons

    • B. 

      Keypads

    • C. 

      Programmable controllers

    • D. 

      Computers

    • E. 

      None of the above

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