3. Productivity Estimation of the Scraper

Try these first

1. 1.

   Define swell factor and provide an example.

   Hint

   Remember how soil expands when disturbed.

2. 2.

   What is the average loading time for a scraper?

   Hint

   This value is given directly in the lecture.

3. 3.

   What does the swell factor represent?

   • Weight of soil
   • Volume change of soil
   • Speed of the scraper

   Hint

   Think of what happens to soil when you disturb it.

4. 4.

   True or False: The average loading time for a scraper is longer than the average dumping time.

   • True
   • False

   Hint

   Compare the two times directly.

5. 5.

   If a scraper has a trimmed capacity of 30 m³ but utilizes a swell factor of 0.82 when loaded with wet soil, compute the effective load it can carry.

   Hint

   Consider the ratio of loose to banked soil carefully.

6. 6.

   Analyze the impact of reducing the pusher's cycle time to 1.2 minutes on the balance of scrapers. Determine the adjusted number of scrapers that could be optimized.

   Hint

   Remember to round accordingly to whole numbers!