3.3. Cycle Time and Productivity Implications

Try these first

1. 1.

   What happens to air density at higher altitudes?

   Hint

   Think about how this might affect combustion.

2. 2.

   Name a device used to improve engine efficiency at higher altitudes.

   Hint

   What device compresses air for combustion?

3. 3.

   How does altitude affect engine performance?

   • Increases air density
   • Decreases air density
   • Has no effect

   Hint

   Consider what happens when you climb mountains.

4. 4.

   True or False: Using turbochargers improves engine performance at high altitudes.

   • True
   • False

   Hint

   What do turbochargers do?

5. 5.

   Calculate the effective usable power for a construction machine when given the gross power output and the losses incurred from altitude and resistance. The gross power is 200 HP, with losses at 30 HP due to altitude and resistance issues.

   Hint

   What do we subtract from the total power?

6. 6.

   If a performance chart indicates that a machine can achieve 90% efficiency at sea level but only 70% at a high altitude, what are the potential implications for productivity over continuous operation?

   Hint

   Consider the efficiency implications over time!