EARTHWORK EXAM 2 LATEST 2024-2025 WITH ACTUAL
QUESTIONS AND CORRECT VERIFIED ANSWERS ALREADY
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Factors an engineer must identify when considering the material-handling -
ANSWER-Equipment type
Size
Number
The Fundamental Principle of Equipment Power - ANSWER-1. Speed affects
cycle time
2. Cycle time drives production
3. Production determines cost
Three power considerations - ANSWER-Required power (baseline)
Available power (power machine has)
Useable power (based on conditions/equip, use)
RPM (N) - ANSWER-Rotations per minute (measure of engine speed)
,Horsepower (HP) - ANSWER-a common unit of power, Gross HP (theoretical)
Flywheel HP (measured)
Rated HP (takes SAE efficiency into account)
Torque - ANSWER-a force that causes rotation
Developed power (foot pounds)
SAE Efficiency - ANSWER-Assume .85 efficiency (unless number is given)
Theoretical engine efficiency is degraded by engine accessories
Transmission / Gear Ratio - ANSWER-Conversion of engine rpm to drive shaft
rotations
Rolling Resistance - ANSWER-resistance of a level surface to constant-velocity
motion across it
Grade Resistance - ANSWER-The force-opposing movement of a machine up a
frictionless slope
Coefficient of Traction - ANSWER-factor by which the total weight on the drive
wheels or tracks should be multiplied to determine the maximum possible
tractive force
Rimpull - ANSWER-Tractive force between the tires of a machine's driving
wheels and the surface on which they travel (normally wheeled equipment)
, Drawbar pull - ANSWER-available pull exerted on a towed load (normally track
type equipment)
Payload (Struck and Heaped Volume) - ANSWER-Carrying capacity of
equipment, volumetric & gravimetric
Struck Vol - soil even w the top of bed or bucket
Heaped Vol - Soil Above the top of bed or bucket
The average cycle time table for hoes maybe used when all of the following are
true EXCEPT - ANSWER-Swing angle is 120 to 180 degrees
When operating a hoe, the worst fill factor is for which of the following
excavated material.? - ANSWER-Poorly blasted rock
A truck and trailer dumps its load by transferring the trailer to the dump truck.
- ANSWER-False
Utility Profile plans commonly use different horizontal and vertical scales. -
ANSWER-True
Which TWO of the following are considered gravity lines? - ANSWER-Sanitary
Sewer
Storm Drain
When using trench boxes, the entire length of the excavation must be
protected. - ANSWER-False
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