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133 CHST Exam Study Guide Questions with Correct Answers

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133 CHST Exam Study Guide Questions with Correct Answers Is a trench considered an excavation? >>>Yes What is the distance a worker needs to maintain from power lines? >>>10ft What does the severity of electric shock depend on? >>>Path of current, amount of current, duration of exposure True or false: electrical current as low as 75 milliamps can cause death? >>>True What are some examples of surcharge loads? >>>Spoils pile and equip being too close to walls What is the correct extension cord for construction? >>>3 wire type designed for hard or extra hard use True or false: Exposed metal parts of equipment should be grounded >>>True How does a gfci protect against electrical shock? >>>Detects the difference in current between the black and white wires How can overloaded circuit hazards be controlled? >>>Through the use of electrical protective devices What are some examples of electrical protective devices? >>>Gfcis, fuses, circuit breakers What is static electricity? >>>An electric charge that cannot move How wide must the platform of a scaffold be? >>>18 inches The platform of a scaffold must be capable of supporting its weight and __________ times the maximum load. >>>Four The ropes or wires used in suspension scaffolds must be capable of supporting ______ times the load. >>>Six What should be used to restrain supported scaffold platforms from tipping? >>>Guys, ties, or braces What is Fall Prevention? >>>The process, equipment, and methods used to actually prevent a fall from occurring. What is fall protection? >>>The process, equipment, and methods used to protect a worker once a fall has occurred. The top edge height of a guardrail should be _________ in. above the walking/working surface. >>>42 +/- 3 What are some common hazards associated with hot work? >>>-Health hazards (air contaminants from welding operations [iron oxide, zinc, beryllium, copper], burns, burns to the eyes from flashes) -Physical hazards (tripping from hoses) -fires and explosions (igniting gases, improper storage) What are some controls for the hazards created when performing hot work? >>>Protect or remove fire hazards in the area, confine heat, sparks, and slag, fire extinguishing equipment available, ventilation What are some common electrical hazards? >>>Exposed electrical parts, overhead power lines, inadequate wiring, defective or damaged cords and wires, improper use of flexible cords, improper grounding, overloaded circuits

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