CHST Exam Study Guide Graded A+

Is a trench considered an excavation? - Answer-Yes What is the distance a worker needs to maintain from power lines? - Answer-10ft What does the severity of electric shock depend on? - Answer-Path of current, amount of current, duration of exposure True or false: electrical current as low as 75 milliamps can cause death? - Answer-True What are some examples of surcharge loads? - Answer-Spoils pile and equip being too close to walls What is the correct extension cord for construction? - Answer-3 wire type designed for hard or extra hard use True or false: Exposed metal parts of equipment should be grounded - Answer-True How does a gfci protect against electrical shock? - Answer-Detects the difference in current between the black and white wires How can overloaded circuit hazards be controlled? - Answer-Through the use of electrical protective devices What are some examples of electrical protective devices? - Answer-Gfcis, fuses, circuit breakers What is static electricity? - Answer-An electric charge that cannot move How wide must the platform of a scaffold be? - Answer-18 inchesThe platform of a scaffold must be capable of supporting its weight and __________ times the maximum load. - Answer-Four The ropes or wires used in suspension scaffolds must be capable of supporting ______ times the load. - Answer-Six What should be used to restrain supported scaffold platforms from tipping? - Answer-Guys, ties, or braces What is Fall Prevention? - Answer-The process, equipment, and methods used to actually prevent a fall from occurring. What is fall protection? - Answer-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. - Answer-42 +/- 3 What are some common hazards associated with hot work? - Answer--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? - Answer-Protect or remove fire hazards in the area, confine heat, sparks, and slag, fire extinguishing equipment available, ventilation What are some common electrical hazards? - Answer-Exposed electrical parts, overhead power lines, inadequate wiring, defective or damaged cords and wires, improper use of flexible cords, improper grounding, overloaded circuits What are some controls utilized for electrical hazards? - Answer-Training, planning, gfci's, fuses, circuit breakers, lockout tagoutWhat are some common hazards associated with excavations? - Answer-Weight (nearby vehicles/equipment), vibration, underground utilities, water and soil erosion. What is a surcharge load? - Answer-The spoils pile and the equipment being too close to the vertical walls of the trench. What are some common controls used to mitigate excavation hazards? - Answer-Sloping, shoring, shields, rpe designed protective systems, soil classification. What are some common hazards associated with working at heights? - Answer-slipping, unsafe access, lack of fall protection, scaffold collapse, bad planking, unguarded edges,