SMSTS Technical Standards and Specifications 3 — Questions and Answers
Question 1: Under OSHA's Hazard Communication Standard (29 CFR 1910.1200), how many hazard categories does the GHS system define for flammable liquids?
- 2
- 3
- 4 (Correct answer)
- 5
Correct answer: 4
GHS classifies flammable liquids into 4 categories based on flash point ranges, with Category 1 being most hazardous (flash point below 23°C and boiling point ≤35°C).
Question 2: What standard governs the design and use of falsework (temporary support structures for concrete formwork) in the United States?
- ACI 347
- ACI 318
- ANSI A10.9 (Correct answer)
- OSHA 1926 Subpart Q
Correct answer: ANSI A10.9
ANSI A10.9 (Safety Requirements for Concrete and Masonry Work) covers falsework design, erection, use, and removal requirements on US construction sites.
Question 3: When is a Permit-to-Work system legally required on construction sites under OSHA regulations?
- For all work above 6 feet elevation
- For confined space entry, hot work, and lockout/tagout activities (Correct answer)
- Whenever more than 10 workers are present
- Only for federal government construction contracts
Correct answer: For confined space entry, hot work, and lockout/tagout activities
OSHA mandates written permit systems specifically for confined space entry (1926.1203), hot work, and energy control (lockout/tagout) procedures on construction sites.
Question 4: Per NFPA 241, what minimum fire extinguisher rating is required for general construction site use protecting combustible materials?
- 1-A
- 2-A (Correct answer)
- 4-A
- 10-A
Correct answer: 2-A
NFPA 241 requires a minimum 2-A rated extinguisher for ordinary combustibles in construction areas, ensuring adequate extinguishing capacity.
Question 5: Under ASME B30.5, what is the maximum allowable wind speed for operating a mobile crane?
- 20 mph
- 25 mph
- 30 mph (Correct answer)
- 35 mph
Correct answer: 30 mph
ASME B30.5 specifies that crane operations should cease when wind speeds exceed 30 mph, though manufacturer specifications may require lower limits.
Question 6: What does the 'competent person' designation mean under OSHA construction regulations?
- A licensed professional engineer who stamps structural drawings
- Someone capable of identifying hazards and with authority to take corrective action (Correct answer)
- A worker holding a current OSHA 30-hour card
- A site manager with at least 5 years of supervisory experience
Correct answer: Someone capable of identifying hazards and with authority to take corrective action
OSHA defines a 'competent person' as one capable of identifying existing and predictable hazards and who has authority to take prompt corrective measures to eliminate them.
Question 7: According to OSHA 1926.405, what is the maximum voltage allowed for temporary lighting circuits on construction sites without additional insulation requirements?
- 120V (Correct answer)
- 240V
- 277V
- 480V
Correct answer: 120V
OSHA 1926.405 limits temporary lighting circuits to 120 volts for standard portable hand lamps and construction lighting applications.
SMSTS Technical Standards and Specifications 3
Under OSHA's Hazard Communication Standard (29 CFR 1910.1200), how many hazard categories does the GHS system define for flammable liquids?