1|Page
EARTHWORK EXAM 2 LATEST WITH ACTUAL
QUESTIONS AND CORRECT VERIFIED ANSWERS
ALREADY GRADED A+ 100% GUARANTEED
PASS!
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)
,2|Page
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
, 3|Page
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
EARTHWORK EXAM 2 LATEST WITH ACTUAL
QUESTIONS AND CORRECT VERIFIED ANSWERS
ALREADY GRADED A+ 100% GUARANTEED
PASS!
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)
,2|Page
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
, 3|Page
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
