4.1. Versatility of Bulldozers

Try these first

1. 1.

   What is a correction factor?

   Hint

   Think about how conditions change productivity.

2. 2.

   Why is soil density important for bulldozer productivity?

   Hint

   Connect to the concept of work and density.

3. 3.

   What correction factor should be used for soil density greater than ideal?

   • Greater than 1
   • Less than 1
   • Equal to 1

   Hint

   Think about how density affects power needed.

4. 4.

   True or False: Job efficiency directly affects the number of bank cubic meters moved per hour.

   • True
   • False

   Hint

   Consider how much effective time is used.

5. 5.

   A bulldozer has an ideal productivity output of 120 loose m³/hr. If the soil density is 1750 kg/m³, determine the adjusted productivity. Apply all relevant correction factors: soil density (0.78), operator skill (0.75), and job efficiency (0.83).

   Hint

   Start by applying each correction factor sequentially.

6. 6.

   Analyze a project where the operator is skilled yet job efficiency is low due to poor weather. If the ideal productivity is 150 loose m³/hr with factors of 0.85 for operator skill and 0.6 for job efficiency, calculate the total productive output for a 4-hour operation.

   Hint

   Consider both skill and job efficiency concurrently.