2.4. Unit Cost of Production in Earthmoving Operation

Try these first

1. 1.

   Define cycle time in the context of a bulldozer's operation.

   Hint

   Think of all the tasks a bulldozer performs in one complete operation.

2. 2.

   What is job efficiency?

   Hint

   Consider how long the bulldozer is operational compared to 60 minutes.

3. 3.

   What components are included in the cycle time for a bulldozer?

   • Push time
   • Backtrack time
   • Maneuver time
   • All of the above

   Hint

   Think of all the tasks a bulldozer performs in one complete operation.

4. 4.

   True or False: Job efficiency is the same as cycle time.

   • True
   • False

   Hint

   Legitimate job efficiency does not take into account non-working time.

5. 5.

   A bulldozer has a blade load capacity of 2.0 loose cubic meters and a cycle time of 2.5 minutes. How many loose cubic meters can it push in an hour if the job efficiency is 50%?

   Hint

   Keep in mind job efficiency affects overall output.

6. 6.

   If the bulldozer works in a site with a higher material density that modifies productivity by 30% lower from a base of 100 loose cubic meters per hour, what is the adjusted productivity?

   Hint

   Think about how density affects bulldozer performance!