CHST CHST - Construction Health and Safety Technician Scaffolding and Elevated Work Platforms Questions and Answers 4 — Questions and Answers
Question 1: Under OSHA 29 CFR 1926.502, what is the minimum height at which personal fall arrest systems must be used on scaffolding when guardrails are not provided?
- 6 feet (Correct answer)
- 10 feet
- 15 feet
- 4 feet
Correct answer: 6 feet
OSHA requires fall protection for scaffold workers at heights of 6 feet or more above a lower level when guardrails are not provided.
Question 2: What is the OSHA-required minimum distance that a scaffold must be erected from an energized power line rated at 50 kV or less?
- 10 feet (Correct answer)
- 3 feet
- 6 feet
- 20 feet
Correct answer: 10 feet
OSHA 1926.416 requires scaffolds to be erected at least 10 feet from energized power lines rated 50 kV or less.
Question 3: Which type of scaffold relies solely on the building structure for support and has no legs, poles, or uprights?
- Suspended scaffold (Correct answer)
- Supported scaffold
- Mobile scaffold
- Pump jack scaffold
Correct answer: Suspended scaffold
Suspended scaffolds hang from an overhead structure using ropes or other non-rigid means rather than being supported from below.
Question 4: When using a two-point suspension scaffold (swing stage), what is the required safety factor for the supporting ropes?
- 6 to 1 (Correct answer)
- 4 to 1
- 10 to 1
- 2 to 1
Correct answer: 6 to 1
OSHA requires a minimum safety factor of 6:1 for suspension ropes on two-point adjustable suspension scaffolds.
Question 5: A competent person inspects a scaffold and finds a plank with a split running along the grain for 18 inches. What is the correct action?
- Remove and replace the plank immediately (Correct answer)
- Mark the plank and monitor it daily
- Reinforce with a steel clamp and continue use
- Flip the plank over and continue use
Correct answer: Remove and replace the plank immediately
Any scaffold plank with visible defects such as splits compromising structural integrity must be immediately removed from service.
Question 6: What is the maximum allowable load per scaffold plank for a light-duty scaffold?
- 25 pounds per square foot (Correct answer)
- 50 pounds per square foot
- 75 pounds per square foot
- 10 pounds per square foot
Correct answer: 25 pounds per square foot
OSHA defines light-duty scaffolds as those designed to carry a maximum of 25 pounds per square foot.
Question 7: Which OSHA standard specifically governs scaffolding used in construction activities?
- 29 CFR 1926 Subpart Q (Correct answer)
- 29 CFR 1910 Subpart D
- 29 CFR 1926 Subpart M
- 29 CFR 1910 Subpart F
Correct answer: 29 CFR 1926 Subpart Q
OSHA's scaffolding requirements for construction are found in 29 CFR 1926 Subpart Q (Scaffolds).
CHST CHST - Construction Health and Safety Technician Scaffolding and Elevated Work Platforms Questions and Answers 4
Under OSHA 29 CFR 1926.502, what is the minimum height at which personal fall arrest systems must be used on scaffolding when guardrails are not provided?