Module 6 Practice Questions on Loop Diagrams and Centralized Computer Control
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Questions and Answers

What is a typical characteristic of loop diagrams?

  • They show both the minimum and optional items that are required. (correct)
  • They are produced on an as-needed basis after the plant is running.
  • They are typically developed by a company’s engineering staff.
  • They are relatively inexpensive to produce.

    • Which of the following is true of centralized computer control?

  • Supervisory control used programmable logic controllers (PLCs) that were designed to be stand-alone and had little need for communication networks.
  • Centralized computer control was more reliable than using many single loop controllers. (correct)
  • Wiring and design cost less and were more scalable than with decentralized controls.
  • Redundant control often required analog instruments that make control strategy changes more difficult.

    • What is NOT included in a piping and instrument diagram?

  • Failure thresholds
  • Instrumentation devices
  • Communication between instrumentation devices (correct)
  • Accessibility of devices to the operator

    • How many wires are needed from the remote I/O location to the control room when using multiplexing for 16 RTDs?

    <p>16</p> Signup and view all the answers

    Who develops consensus standards?

    <p>Professional societies</p> Signup and view all the answers

    What is MOST typical regarding loop diagrams?

    <p>They show both the minimum and optional items that are required.</p> Signup and view all the answers

    Which of the following is true about programmable logic controllers (PLCs)?

    <p>PLCs have generally adopted the Ladder Logic standard.</p> Signup and view all the answers

    Which of the following is LEAST applicable to solid state devices?

    <p>Turndown ratio</p> Signup and view all the answers

    Which of the following is NOT regulated by industry code related to pressure vessels?

    <p>Mandatory replacement of vessels</p> Signup and view all the answers

    In a document development process, which item would typically be developed first?

    <p>Location plans</p> Signup and view all the answers

    Which of the following is true about operating instructions?

    <p>They may be included in a functional specification or operating description.</p> Signup and view all the answers

    Which of the following is true of traditional supervisory control and data acquisition (SCADA)?

    <p>Remote termination units (RTUs) using microprocessors are considered “smart” and don’t need a master termination unit (MTU).</p> Signup and view all the answers

    Which document requires the greatest amount of engineering time in the development process?

    <p>Logic diagram</p> Signup and view all the answers

    Which of the following is generally NOT recommended for inclusion in a P&ID (Piping and Instrumentation Diagram)?

    <p>Vessel data sheets</p> Signup and view all the answers

    What allowed for a physical distribution of tasks in a distributed network?

    <p>Distribution of tasks among many processors</p> Signup and view all the answers

    What is NOT included in a PFD (Process Flow Diagram)?

    <p>Amount of product a plant might make</p> Signup and view all the answers

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