National Commission for the
Certification of Crane Operators
Committed to Quality, Integrity, and Fairness in Testing since 1995


​Digger Derrick Operator

Written Exam - Sample Question Answers

Following are the answers to the Digger Derrick Operator Written Exam sample test questions:

  1. The reason for using blocking under the digger derrick’s outrigger pads is to:
    1. Decrease the applied ground pressure
  1. Which function could cause the shackle/hook to contact the boom tip?
    1. Extending the boom
  1. It is always the operator’s responsibility to:
    1. Know the load weight before lifting
  1. According to ANSI A10.31 who is permitted to operate a digger derrick?
    1. Trained and authorized personnel
  1. Where shall the digger derrick operator’s manual be located?
    1. On the digger derrick vehicle
  1. Using configuration listed below, what is the farthest radius a 3,125 lb. load can be set over the rear of the digger derrick (see load charts)?

    Make: Terex
    Second Section: ??
    Boom Angle: N/A         
    Third Section: ??
    Radius: ??
    Rigging: 75 lb.
    Others: N/A
    Jib: N/A
    Load Line: 1-part
    Jib Length: N/A

    1. 27.5 ft.