3.1. Problem on Productivity Estimation

Try these first

1. 1.

   Define the swell factor and its importance in scraper operations.

   Hint

   Think about how volume changes when material is disturbed.

2. 2.

   What is cycle time?

   Hint

   Consider all the stages of the operation.

3. 3.

   What is the swell factor?

   • A measure of load weight
   • The ratio of loose to bank dry unit weight
   • Cycle time definition

   Hint

   Think about how soil changes when disturbed.

4. 4.

   True or False: Rolling resistance is the same in all haul route conditions.

   • True
   • False

   Hint

   Consider different surfaces and their effects.

5. 5.

   Consider a scenario where the rolling resistance on a new haul path increases to 80 kg per ton. How would this change the effective speed and productivity of a scraper?

   Hint

   Reflect on how resistance affects motion in machines.

6. 6.

   A scraper operating with a swell factor of 1.2 is loading a material with a unit weight of 1700 kg/m³. Calculate the volume in bank cubic meters.

   Hint

   Use the definition of swell factor properly.