1. PLCs are generally placed within an enclosure.
.TRUE
Accessibility: Keyboard Navigation
Bloom’s: Object 1. Factual
Bloom’s: Verb 1. Remember
Chapter: 13 PLC Installation Practices, Editing, and Troubleshooting
Difficulty: Easy
Gradable: automatic
Learning Objective: Describe the requirements for PLC enclosures
Section: 13.01 PLC Enclosures
Subtopic: PLC Enclosures
Topic: PLC Installation Practices, Editing, and Troubleshooting
Units: NA
2. An enclosure is used to shield the controller from electrical noise and airborne contaminants.
TRUE
Accessibility: Keyboard Navigation
Bloom’s: Object 1. Factual
Bloom’s: Verb 1. Remember
Chapter: 13 PLC Installation Practices, Editing, and Troubleshooting
Difficulty: Easy
Gradable: automatic
Learning Objective: Describe the requirements for PLC enclosures
Section: 13.01 PLC Enclosures
Subtopic: PLC Enclosures
Topic: PLC Installation Practices, Editing, and Troubleshooting
Units: NA
3. Most PLC installations require additional cooling provisions, not included in the original installation.
FALSE
Accessibility: Keyboard Navigation
Bloom’s: Object 1. Factual
Bloom’s: Verb 1. Remember
Chapter: 13 PLC Installation Practices, Editing, and Troubleshooting
Difficulty: Easy
Gradable: automatic
Learning Objective: Describe the requirements for PLC enclosures
Section: 13.01 PLC Enclosures
Subtopic: PLC Enclosures
Topic: PLC Installation Practices, Editing, and Troubleshooting
Units: NA
4. A hardwired electromechanical master control relay is not normally included as part of the wiring for a PLC system.
FALSE
Accessibility: Keyboard Navigation
Bloom’s: Object 1. Factual
Bloom’s: Verb 2. Understand
Chapter: 13 PLC Installation Practices, Editing, and Troubleshooting
Difficulty: Easy
Gradable: automatic
Learning Objective: Describe the requirements for PLC enclosures
Section: 13.01 PLC Enclosures
Subtopic: PLC Enclosures
Topic: PLC Installation Practices, Editing, and Troubleshooting
Units: NA
5. PLC malfunctions due to electrical noise usually produce temporary occurrences of operating errors.
TRUE
Accessibility: Keyboard Navigation
Bloom’s: Object 1. Factual
Bloom’s: Verb 2. Understand
Chapter: 13 PLC Installation Practices, Editing, and Troubleshooting
Difficulty: Easy
Gradable: automatic
Learning Objective: Identify and describe proper noise reduction techniques
Section: 13.02 Electrical Noise
Topic: PLC Installation Practices, Editing, and Troubleshooting
Units: NA
6. Electromagnetic interference (EMI) may enter a PLC system through radiation.
TRUE
Accessibility: Keyboard Navigation
Bloom’s: Object 1. Factual
Bloom’s: Verb 2. Understand
Chapter: 13 PLC Installation Practices, Editing, and Troubleshooting
Difficulty: Easy
Gradable: automatic
Learning Objective: Identify and describe proper noise reduction techniques
Section: 13.02 Electrical Noise
Subtopic: PLC Noise Reduction
Topic: PLC Installation Practices, Editing, and Troubleshooting
Units: NA
7. Common potential noise generating devices include non-inductive resistive loads.
FALSE
Accessibility: Keyboard Navigation
Bloom’s: Object 1. Factual
Bloom’s: Verb 2. Understand
Chapter: 13 PLC Installation Practices, Editing, and Troubleshooting
Difficulty: Easy
Gradable: automatic
Learning Objective: Identify and describe proper noise reduction techniques
Section: 13.02 Electrical Noise
Subtopic: PLC Noise Reduction
Topic: PLC Installation Practices, Editing, and Troubleshooting
Units: NA
8. A fiber optic wired control system is most susceptible to electrical noise.
FALSE
Accessibility: Keyboard Navigation
Bloom’s: Object 1. Factual
Bloom’s: Verb 2. Understand
Chapter: 13 PLC Installation Practices, Editing, and Troubleshooting
Difficulty: Easy
Gradable: automatic
Learning Objective: Identify and describe proper noise reduction techniques
Section: 13.02 Electrical Noise
Subtopic: PLC Noise Reduction
Topic: PLC Installation Practices, Editing, and Troubleshooting
Units: NA
9. Running signal wiring and power wiring in the same conduit helps to cut down on electrical noise.
FALSE
Accessibility: Keyboard Navigation
Bloom’s: Object 1. Factual
Bloom’s: Verb 2. Understand
Chapter: 13 PLC Installation Practices, Editing, and Troubleshooting
Difficulty: Easy
Gradable: automatic
Learning Objective: Identify and describe proper noise reduction techniques
Section: 13.02 Electrical Noise
Subtopic: PLC Noise Reduction
Topic: PLC Installation Practices, Editing, and Troubleshooting
Units: NA
10. Most solid-state switches will conduct a small amount of leakage current in the off state.
TRUE
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