Automatic Process Control - 2

25 Questions | Total Attempts: 281

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Electronics Quizzes & Trivia

Explain the purpose, operation, and give examples of on-off, proportional, proportional plus-reset, and proportional-plus-reset-plus-derivative control. Define proportional band and gain.


Questions and Answers
  • 1. 
    Which control mode would most likely cause a final control element to move from on to off, or from fully opened to fully closed?"
    • A. 

      A. Two-position control

    • B. 

      B. PID control

    • C. 

      C. Rate control

    • D. 

      D. Reset control

  • 2. 
    In a two-position control system, the amount of change that can occur in the process without causing a control system response is known as what?
    • A. 

      A. Repeats per minute

    • B. 

      B. Minutes per repeat

    • C. 

      C. Dead zone

    • D. 

      D. Gain

  • 3. 
    Which of these characteristics applies to two-position control?          
    • A. 

      A. A proportional output signal is produced.

    • B. 

      B. Reset and rate control features are combined

    • C. 

      C. Output signals are based on integration.

    • D. 

      D. A final control element is moved from one extreme to another.

  • 4. 
    A proportional controller can normally return a controlled variable to set point if what type of process disturbance occurs?
    • A. 

      A. Continual

    • B. 

      B. Temporary

    • C. 

      C. Worsening

    • D. 

      D. Permanent

  • 5. 
    In a proportional control system, what is the difference between the control point and the variable's set point called?"
    • A. 

      A. Offset

    • B. 

      B. Dead zone

    • C. 

      C. Gain

    • D. 

      D. Reset

  • 6. 
    The inverse of proportional band is known as what?"
    • A. 

      A. Offset

    • B. 

      B. Gain

    • C. 

      C. Reset

    • D. 

      D. MPR

  • 7. 
    Select the choice that most accurately completes this sentence. A narrow proportional band_________.
    • A. 

      A. Is greater than a 100% PB

    • B. 

      B. Minimizes cycling

    • C. 

      C. Increases the offset in a process

    • D. 

      D. Is less than a 100% PB

  • 8. 
    The function of reset control is to adjust the output of a proportional controller to eliminate what?
    • A. 

      A. Offset

    • B. 

      B. Gain

    • C. 

      C. Proportional band

    • D. 

      D. Dead rate

  • 9. 
     Which of these choices is another name for reset control?"
    • A. 

      A. Derivative-plus-reset

    • B. 

      B. Proportional-plus-integral

    • C. 

      C. Proportional-plus-derivative

    • D. 

      D. Integral-plus-derivative

  • 10. 
    Reset control action is most likely to be expressed in terms of what
    • A. 

      A. A percentage

    • B. 

      B. Gain

    • C. 

      C. Offset

    • D. 

      D. Minutes per repeat

  • 11. 
    Which of these control modes increases, or repeats, the amount of proportional control until a controlled variable returns to set point?"
    • A. 

      A. Rate control

    • B. 

      B. Reset control

    • C. 

      C. Gain control

    • D. 

      D. Two-position control

  • 12. 
    Which of the following statements about rate control is true?"
    • A. 

      A. Rate control normally exists by itself

    • B. 

      B. Rate control responds to the speed at which a variable deviates from set point.

    • C. 

      C. Rate control action is based on a mathematical function called integration.

    • D. 

      D. Rate control action is often expressed in minutes per repeat. d. Rate control action is often expressed in minutes per repeat. d. Rate control action is often expressed in minutes per repeat.

  • 13. 
    Which of these control modes is sometimes referred to as proportional-plus-derivative control?"
    • A. 

      A. Reset control

    • B. 

      B. PB control

    • C. 

      C. Rate control

    • D. 

      D. Offset control

  • 14. 
    In which of these control modes does a controller produce an instant boost in the proportional output signal to try to stop changes in the input as soon as they're detected?"
    • A. 

      A. Reset control

    • B. 

      B. PB control

    • C. 

      C. Rate control

    • D. 

      D. Offset control

  • 15. 
    The 'D' in PID control stands for derivative, which is the same as what?"
    • A. 

      A. Digital

    • B. 

      B. Rate

    • C. 

      C. Reset

    • D. 

      D. Proportional

  • 16. 
    The I in PID control stands for integral, which is the same as what?"
    • A. 

      A. Digital

    • B. 

      B. Rate

    • C. 

      C. Reset

    • D. 

      D. Proportional

  • 17. 
    What mode of control combines the precise response action of reset control with the fast response action of rate control?"
    • A. 

      A. Gain control

    • B. 

      B. MPR control

    • C. 

      C. Two-position control

    • D. 

      D. PID control

  • 18. 
    Which of these control modes will most likely cause a final control element to move from one extreme to another?"
    • A. 

      A. Two-position control

    • B. 

      B. PID control

    • C. 

      C. Rate control

    • D. 

      D. Reset control

  • 19. 
    A new steady-state value that's sometimes established for a controlled variable after a process disturbance is known as what?"
    • A. 

      A. The gain

    • B. 

      B. The PID

    • C. 

      C. The control point

    • D. 

      D. The reset point

  • 20. 
    The term 'gain' can be best described as the inverse of which of these choices?"
    • A. 

      A. Offset

    • B. 

      B. Reset

    • C. 

      C. Dead zone

    • D. 

      D. Proportional band

  • 21. 
    Which of these statements about reset control action is true?"
    • A. 

      A. It is normally found in a two-position control system.

    • B. 

      B. It is also called proportional-plus-derivative control.

    • C. 

      C. It adjusts the output of a proportional controller to help eliminate offset.

    • D. 

      D. It normally exists by itself.

  • 22. 
    Which of these control modes is designed to eliminate offset?"
    • A. 

      A. Two-position

    • B. 

      B. Proportional

    • C. 

      C. Proportional-plus-rate

    • D. 

      D. Proportional-plus-reset

  • 23. 
    Integral control is also known as what?"
    • A. 

      A. Rate control

    • B. 

      B. Reset control

    • C. 

      C. Gain control

    • D. 

      D. Two-position control

  • 24. 
    Which of these control modes responds to the speed at which a variable changes from set point?"
    • A. 

      A. Two-position

    • B. 

      B. Proportional

    • C. 

      C. Proportional-plus-rate

    • D. 

      D. Proportional-plus-reset

  • 25. 
    Since rate control responds only during changes in the input to a controller, it may allow what to occur      
    • A. 

      A. Reset action

    • B. 

      B. Integration

    • C. 

      C. Offset

    • D. 

      D. Gain

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