1. Earth Moving Equipment-Scrapers (Part-2)

Try these first

1. 1.

   Define the term 'swell factor'.

   Hint

   Think of it as a measure of how much the material expands when disturbed.

2. 2.

   What is included in cycle time calculations for scrapers?

   Hint

   Consider all the actions the scraper takes to complete its job.

3. 3.

   What is the swell factor?

   • The weight of material
   • The ratio of loose dry unit weight to bank dry unit weight
   • A type of soil

   Hint

   Think about material properties relevant to earth moving.

4. 4.

   True or False: A pusher increases the swell factor by 5%.

   • True
   • False

   Hint

   Recall how pressure impacts material density.

5. 5.

   A scraper has a heaped capacity of 30 m³. If the swell factor is modified by a 15% increase when a pusher assists, calculate the effective bank volume it can carry.

   Hint

   Split the problem into steps, starting with the effective load and then modifying the swell factor.

6. 6.

   Calculate the total cycle time if a scraper has loading time of 1.2 minutes, dump time of 0.5 minutes, and return to load time of 2 minutes.

   Hint

   Make sure to factor in all components, even shorter ones.