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Accident Investigation

Quiz Questions

1. A detailed analysis of an accident will normally reveal three cause levels:
Basic, indirect, and direct
One, two and three
What, where, when
2. The direct cause is usually the result of one or more unsafe acts or unsafe conditions, or both.
3. The recurrence of accidents of a particular type or those with common causes shows :
areas needing special accident prevention emphasis.
Carelessness of the operators or personnel in that section
The need of more warning and hazard signs in that area.
4. One of the investigative procedures is:
Visit the accident site to get updated information.
Watching a video of an accident investigation is, as good as, going to the scene of the accident.
5. When it comes to Fact-Finding about an accident which one of the following is important;

  1. Gather evidence from many sources during an investigation.
  2. Get information from witnesses and reports as well as by observation.
  3. Interview witnesses as soon as possible after an accident.
  4. Inspect the accident site before any changes occur.
  5. Make photographs and sketches of the accident scene.
  6. Record all pertinent data on maps. Get copies of all reports.
  7. Documents containing normal operating procedures, flow diagrams, maintenance charts, or reports of difficulties or abnormalities are particularly useful.
  8. Keep complete and accurate notes in a bound notebook.
  9. Record pre-accident conditions, the accident sequence, and post-accident conditions.
  10. In addition, document the location of victims, witnesses, machinery, energy sources,
  11. and hazardous materials.
All of the above
6. In conducting interviews, which one of the steps bellow should be taken.

  1. Appoint a speaker for the group.
  2. Get preliminary statements as soon as possible from all witnesses.
  3. Locate the position of each witness on a master chart (including the direction of view).
  4. Arrange for a convenient time and place to talk to each witness.
  5. Explain the purpose of the investigation (accident prevention) and put each witness at ease.
  6. Listen, let each witness speak freely, and be courteous and considerate.
  7. Take notes without distracting the witness. Use a tape recorder only with consent of the witness.
  8. Use sketches and diagrams to help the witness.
  9. Emphasize areas of direct observation. Label hearsay accordingly.
  10. Be sincere and do not argue with the witness.
  11. Record the exact words used by the witness to describe each observation. Do not "put words into a witness’ mouth."
  12. Word each question carefully and be sure the witness understands.
  13. Identify the qualifications of each witness (name, address, occupation, years of experience, etc.).
  14. Supply each witness with a copy of his or her statements. Signed statements are desirable
1 through 7
All of the above
7. In Scientific method problem solving, which one of the methods bellow is used.
Making observation
Developing hypotheses
Testing the hypotheses
All three above.
8. In using the scientific method, the investigator must be careful to eliminate personal bias. The investigator must be willing to consider a range of alternatives. Finally, he or she must recognize that accidents often result from the chance occurrence of factors that are too numerous to evaluate fully.
9. In Change Analysis the following steps are taken to determine the cause of the accident.

  1. Define the problem (What happened?).
  2. Establish the norm (What should have happened?).
  3. Identify, locate, and describe the change (What, where, when, to what extent).
  4. Specify what was and what was not affected.
  5. Identify the distinctive features of the change.
  6. List the possible causes.
  7. Select the most likely causes.
1, 2 and 3
1 through 5
All of the above
10. In Fault tree Analysis, the following methodology is used:

Fault tree analysis (FTA) is a logic diagram. It shows all the potential causes of an accident or other undesired event. The undesired event is at the top of a "tree." Reasoning backward from this event, determine the circumstances that can lead to the problem. These circumstances are then broken down into the events that can lead to them, and so on. Continue the process until the identification of all events can produce the undesired event. Use a logic tree to describe each of these events and the manner in which they combine. This information determines the most probable sequence of events that led to the accident.