3. Important Parameters for Backhoe Selection

Try these first

1. 1.

   What angle should a truck be placed at for optimal productivity?

   Hint

   Think about the angle you learned in the class.

2. 2.

   Define Haul Unit Exchange Time.

   Hint

   Focus on the definitions provided.

3. 3.

   What angle is optimal for truck placement relative to the backhoe?

   • 45 degrees
   • 90 degrees
   • 135 degrees

   Hint

   Recall the angle discussed in the context of swing efficiency.

4. 4.

   True or False: The cycle time increases with a larger angle of swing.

   • True
   • False

   Hint

   Think about how long it takes to complete a loading cycle at different angles.

5. 5.

   A construction site requires excavating to a depth of 4 meters. If the optimum height of cut is 6 meters, and the truck is at a 60-degree angle swing, calculate the expected productivity correction factor.

   Hint

   Refer back to your resources for the correction factor table.

6. 6.

   Two backhoes are scheduled for use, but one operates with an angle of swing averaging 120 degrees. If we assume their cycle times are significantly affected, estimate the time difference in loading trucks relative to an ideal 90 degrees.

   Hint

   Remember the impacts of swing angle on productivity described in the section.