3.4. Loading and Operating Conditions

Try these first

1. 1.

   What is the swell factor?

   Hint

   Think about how volume changes when soil is disturbed.

2. 2.

   Why is it important to not exceed the safe operating weight?

   Hint

   Consider the consequences of overloading.

3. 3.

   What is the definition of swell factor?

   • A. The maximum weight a machine can handle
   • B. The ratio of loose dry unit weight to bank dry unit weight
   • C. The total time taken to complete a cycle

   Hint

   Think about how the weight varies as soil is handled.

4. 4.

   True or False: A pusher can serve multiple scrapers efficiently.

   • True
   • False

   Hint

   Consider how many scrapers share the load.

5. 5.

   Calculate the total time for a scraper with a cycle time of 7.78 minutes operating with a pusher of 1.37 minutes, taking into account loading, dumping, and travel times. How many scrapers should be operational for optimal efficiency?

   Hint

   Break down the components of time and consider the operational limits.

6. 6.

   If a hauling path increases gradient resistance to 30 kg per ton instead of 20 kg per ton, how would this affect the overall productivity of the scrapers? Calculate the impact on the estimated productivity.

   Hint

   Consider how resistance prevents movement and slows down the loading process.