5. Example Problem on Productivity Estimation

Try these first

1. 1.

   What is 'fixed time' in the context of cycle time for a bulldozer?

   Hint

   Think about parts of the cycle that do not change.

2. 2.

   Define 'job efficiency'.

   Hint

   It's expressed as a percentage.

3. 3.

   What does cycle time consist of?

   • Only fixed time
   • Only variable time
   • Both fixed and variable time

   Hint

   Remember which timings are varying and which are constant.

4. 4.

   True or False: Productivity increases when operating down a slope.

   • True
   • False

   Hint

   Think about how gravity affects speed.

5. 5.

   Using an ideal production figure of 50 cubic meters per hour from a production curve, how would the productivity change if the correction factor for material density was identified as 0.85 due to heavier soil?

   Hint

   Apply the correction factor to the ideal production value.

6. 6.

   A bulldozer has a blade load capacity of 2.5m³, operates at a speed of 3m/min, and the haul distance is 90 meters. Calculate the productivity per hour and reduce it if the job efficiency is only 40 minutes per hour.

   Hint

   Break down the total time into push and maneuver components to find effective productivity.