Answer Key: Self-Test A-1.2

  1. b. Extremely dangerous
  2. b. 4 ft (1.2 m)
  3. d. Slope the sides of the trench.
  4. c. Limited amount of ventilation.
  5. b. Proper housekeeping
  6. a. Remove it
  7. c. Hazard that is immediate and can be remedied quickly
  8. c. Removal of ground materials for an installation or repair
  9. c. Hydraulic shoring
  10. c. Natural slope formed when excavated material is piled
  11. d. Timber and plank shoring
  12. c. Angle of repose
  13. d. Mechanical room
  14. b. False
  15. b. False
  16. a. 50 mA
  17. c. Ground fault circuit interrupter
  18. b. De-energize the circuit
  19. b. False
  20. a. True
  21. d. Conducted away around 25 times faster than in cold air

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