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Top of Form
1. Plywood cannot be used as a structural member for shoring systems unless the system is designed by a professional engineer.
True False
2. The "four-foot rule":
Refers to your means of escape from an excavation Says a means of escape must be provided if an excavation is more than four feet deep Says the exit must be within 25 feet of every worker All of the above
3. Employees in a trench must wear hard hats at all times.
True False
4. All excavations are trenches.
True False
5. In the event of an accident:
Heavy equipment may be used to free the victim All workers should go to the accident area to assist the rescue First aid should only begin after rescue personnel have arrived An emergency response procedure should be followed
6. Welding pipe in a trench creates a potential hazardous atmosphere.
True False
7. The top width of a short duration trench in type "A" soil that is 10 feet deep and 4 feet at the bottom is:
24 feet 14 feet 19 feet 12 feet
8. Remotely located excavations may be left open and unprotected provided no one is working in the area.
True False
9. Excavation material must be kept at least ______ feet from the edge of the trench.
1 1 1/2 2 None of the above
10. The maximum allowable slope for a type "B" excavation less than 20 feet deep is:
45 degrees 90 degrees 53 degrees 34 degrees
11. Ramps are the only acceptable means of entering and exiting a trench.
True False
12. Statistics show that the majority of trenching fatalities occur in excavations less than ______ feet deep.
6 9 15 18
13. The daily inspection of the excavation site done by the competent person includes:
Checking for possible cave-ins Checking for hazardous atmospheres Checking for hazardous conditions All of the above
14. A trench having 19.5% oxygen is always safe to enter.
True False
15. Emergency rescue equipment must be available and maintained at