CHST CHST - Construction Health and Safety Technician Scaffolding and Elevated Work Platforms Questions and Answers 5 — Questions and Answers
Question 1: What type of scaffold uses adjustable legs to compensate for uneven ground conditions?
- Pump jack scaffold
- Mobile scaffold
- Adjustable leg scaffold (Correct answer)
- Lean-to scaffold
Correct answer: Adjustable leg scaffold
Adjustable leg scaffolds are designed with variable-height legs to maintain a level working platform on uneven terrain.
Question 2: Under OSHA regulations, who is authorized to move a mobile scaffold while a worker is on it?
- No one — workers must dismount before moving (Correct answer)
- A competent person only
- The worker on the scaffold, if moving slowly
- Any worker on the ground
Correct answer: No one — workers must dismount before moving
OSHA prohibits moving mobile scaffolds while workers are on them unless the floor is level, free of obstructions, and specific safety conditions are met per 1926.452(w).
Question 3: What is the purpose of a toe board on a scaffold platform?
- Prevent tools and materials from falling off the platform edge (Correct answer)
- Provide additional footing for workers
- Anchor the scaffold to the structure
- Support the weight of midrails
Correct answer: Prevent tools and materials from falling off the platform edge
Toe boards prevent materials, tools, and debris from being kicked or rolling off scaffold platforms onto workers below.
Question 4: A scissor lift is classified under OSHA regulations as which type of equipment?
- Aerial work platform (AWP)
- Supported scaffold
- Mobile elevated work platform (MEWP)
- Both A and C (Correct answer)
Correct answer: Both A and C
Scissor lifts are classified as both aerial work platforms (AWPs) under OSHA and mobile elevated work platforms (MEWPs) under ANSI A92 standards.
Question 5: What is the minimum bearing capacity required for mudsills placed under scaffold base plates on soft soil?
- Sufficient to support scaffold loads without settling (Correct answer)
- Exactly 2,000 pounds per square foot
- Exactly 500 pounds per square foot
- Sufficient to support 4 times the maximum intended load
Correct answer: Sufficient to support scaffold loads without settling
OSHA requires mudsills and base plates to be capable of supporting the scaffold without settling or displacement, with no specific numerical value mandated.
Question 6: During scaffold erection, which workers are required to have fall protection?
- All workers erecting or dismantling scaffolds above 6 feet when feasible (Correct answer)
- Only workers on completed scaffold platforms
- Workers above 10 feet only
- No workers — scaffold erection is exempt from fall protection requirements
Correct answer: All workers erecting or dismantling scaffolds above 6 feet when feasible
OSHA requires scaffold erectors and dismantlers to have fall protection when feasible, recognizing that guardrails may not yet be in place during the process.
Question 7: What condition requires a scaffold to be immediately removed from service, regardless of other factors?
- Any component is visibly bent, cracked, or structurally compromised (Correct answer)
- The scaffold has been in service for more than 30 days
- More than 5 workers are on the scaffold simultaneously
- The scaffold is not labeled with its manufacturer's name
Correct answer: Any component is visibly bent, cracked, or structurally compromised
Scaffolds with visibly damaged or structurally compromised components must be taken out of service immediately until repaired or replaced.
CHST CHST - Construction Health and Safety Technician Scaffolding and Elevated Work Platforms Questions and Answers 5
What type of scaffold uses adjustable legs to compensate for uneven ground conditions?