STSC Hazard Recognition and Risk Assessment 5

Question 1

A supervisor observes that a crane is operating within 20 feet of energized power lines rated at 50 kV. What is the minimum required clearance per OSHA 1926.1408?

Accepted Answer

15 feet

Answer

OSHA 1926.1408 requires a minimum 20-foot clearance for lines over 50 kV, but the base minimum for lines up to 350 kV is 20 feet; for lines up to 50 kV the minimum is 10 feet—but the voltage here triggers 20 feet.

Question 2

Which leading indicator is most useful for identifying hazard recognition gaps on a construction site?

Accepted Answer

Near-miss reporting rate and trends

Answer

Near-miss reporting is a leading indicator that reveals hazards before injuries occur, allowing supervisors to act proactively.

Question 3

A worker is applying spray paint in an enclosed scaffold enclosure. Which hazard category does this PRIMARILY represent?

Accepted Answer

Chemical/health hazard with confined space elements

Answer

Spray painting in an enclosed area creates chemical vapor exposure and potential oxygen deficiency, classifying the hazard as chemical/health with confined-space characteristics.

Question 4

During a risk assessment, a supervisor must evaluate the likelihood and severity of a hazard. Which combination represents the HIGHEST risk level?

Accepted Answer

High likelihood / High severity

Answer

Risk is a product of both likelihood and severity; a hazard that is both highly probable and highly severe demands the most urgent corrective action.

Question 5

A toolbox talk reveals that several workers are unfamiliar with the signs of heat exhaustion on a hot day. What type of hazard does this represent?

Accepted Answer

Physical hazard

Answer

Heat stress is classified as a physical hazard because it results from environmental energy (thermal) conditions rather than a substance or biological agent.

(STSC) Safety Trained Supervisor Construction Practice Test

(STSC) Safety Trained Supervisor Construction Practice Test

STSC Hazard Recognition and Risk Assessment 5