Module 6 Practice Questions on Loop Diagrams and Centralized Computer Control

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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?

16 Signup and view all the answers

Who develops consensus standards?

Professional societies Signup and view all the answers

What is MOST typical regarding loop diagrams?

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

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

PLCs have generally adopted the Ladder Logic standard. Signup and view all the answers

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

Turndown ratio Signup and view all the answers

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

Mandatory replacement of vessels Signup and view all the answers

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

Location plans Signup and view all the answers

Which of the following is true about operating instructions?

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

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

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

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

Logic diagram Signup and view all the answers

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

Vessel data sheets Signup and view all the answers

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

Distribution of tasks among many processors Signup and view all the answers

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

Amount of product a plant might make Signup and view all the answers

Module 6 Practice Questions on Loop Diagrams and Centralized Computer Control

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