Thermal StressorsEngineering Controls

1. Listed are some examples of engineering controls used in industry except:A. Machine guarding B. Isolation C. Ventilation D. Additional relief workers

Solution: The hierarchy of controls dictates that engineering controls should be used before all other types of control except for elimination and substitution. Machine guarding, isolation and ventilation are all considered forms of engineering controls. Providing relief workers would serve to limit the time of exposure to a hazard and would be considered an administrative control. The correct solution is D.