CHST FREE CHST General Questions and Answers 4 — Questions and Answers
Question 1: Under OSHA's Scaffolding Standard (29 CFR 1926 Subpart L), scaffolds must be capable of supporting their own weight plus how many times the maximum intended load?
- 2 times
- 3 times
- 4 times (Correct answer)
- 5 times
Correct answer: 4 times
OSHA requires scaffolds to be designed, constructed, and loaded so they can support their own weight plus at least four times the maximum intended load.
Question 2: Which hazard control method is considered most effective in the hierarchy of controls?
- Administrative controls
- Engineering controls
- Elimination (Correct answer)
- Personal protective equipment
Correct answer: Elimination
Elimination—physically removing the hazard—is the most effective control measure because it completely removes the source of the hazard from the workplace.
Question 3: A 'competent person' in OSHA construction standards is defined as someone who can:
- Perform tasks without supervision
- Identify hazardous conditions and has authority to correct them (Correct answer)
- Certify workers are trained
- Approve safety plans on behalf of OSHA
Correct answer: Identify hazardous conditions and has authority to correct them
OSHA defines a competent person as one who is capable of identifying existing and predictable hazardous conditions and has authorization to take corrective measures.
Question 4: According to OSHA, what minimum illumination level (in foot-candles) is required for general construction areas?
- 3 foot-candles
- 5 foot-candles (Correct answer)
- 10 foot-candles
- 30 foot-candles
Correct answer: 5 foot-candles
OSHA's 29 CFR 1926.56 requires a minimum of 5 foot-candles of illumination for general construction areas and excavations.
Question 5: Which type of fire extinguisher is appropriate for Class C (electrical) fires?
- Water-based extinguisher
- CO2 or dry chemical extinguisher (Correct answer)
- Wet chemical extinguisher
- Class K extinguisher
Correct answer: CO2 or dry chemical extinguisher
CO2 and dry chemical extinguishers are rated for Class C fires because they use non-conductive agents; water conducts electricity and must never be used on electrical fires.
Question 6: What is the purpose of a 'toolbox talk' (tailgate meeting) in construction safety management?
- To formally document all workplace injuries
- To provide brief, focused safety training before work begins (Correct answer)
- To review OSHA citations with workers
- To conduct formal hazard assessments requiring signatures
Correct answer: To provide brief, focused safety training before work begins
Toolbox talks are short, informal safety meetings held at the worksite to address specific hazards relevant to the day's tasks and reinforce safe work practices.
Question 7: Under OSHA's Lockout/Tagout standard (29 CFR 1910.147), which energy control procedure requires the use of a lock to secure the energy isolation device?
- Tagout
- Lockout (Correct answer)
- Blockout
- Zero energy state
Correct answer: Lockout
Lockout uses a physical lock placed on an energy isolation device to prevent re-energization, which is more secure than tagout alone.
CHST FREE CHST General Questions and Answers 4
Under OSHA's Scaffolding Standard (29 CFR 1926 Subpart L), scaffolds must be capable of supporting their own weight plus how many times the maximum intended load?