3. Approaches to Estimate Productivity

Try these first

1. 1.

   What are the three main components of cycle time?

   Hint

   Remember the acronym PBM.

2. 2.

   How is productivity calculated?

   Hint

   Think about the measurement units.

3. 3.

   What is the primary formula for calculating productivity?

   • Blade Load + Cycle Time
   • Blade Load / Cycle Time
   • Cycle Time / Blade Load

   Hint

   Think about the relationship between time and quantity.

4. 4.

   True or False: Production curves represent ideal productivity conditions.

   • True
   • False

   Hint

   Recall how real conditions vary from ideal.

5. 5.

   A bulldozer completes a cycle in 10 minutes under ideal conditions. Calculate the productivity in cubic meters per hour if the blade can carry 1.5 cubic meters and job efficiency is 70%. Then apply a correction factor of 0.8 due to operator inexperience.

   Hint

   Break down into effective time before applying correction factors.

6. 6.

   Calculate the effect of a 15% increase in soil density which drops productivity from 80 to 65 cubic meters. Show how the correction factor helps maintain efficiency.

   Hint

   Use percentage decrease in productivity to find impacts.