Instrumentation – Chapter 18 – Test Bank

Which of the following is a conditional logic in which a process is either fully engaged or not engaged at all?

• Boolean logic

• And/or

• If/then

• On/off

Why is it important to have accurate PLC ladder drawings?

• Technicians did not have the training to modify diagrams.

• Modifications were time-consuming.

• To avoid injury.

What do PLCs allow?

• Changes to the shelf position to be recorded automatically

• Changes to MCCs to be recorded automatically

• Changes to DCS to be recorded automatically

• Changes to ladder diagrams to be recorded automatically

What is and/or logic used to control?

• A process in which either one or both variables exist

• A process so that the process is either fully engaged or not engaged at all

• A process in which multiple conditions are present at once

• A process in which one condition leads to the next

Which of the following rely heavily on PLCs?

• Washing machines

• Car horns

• Air conditioners

• Emergency shutdown systems

What is the most commonly used method for interfacing with a PLC?

• Function block diagrams

• Structured text

• Ladder diagrams

• Instruction list