CM 2113 FINAL EXAM - WANG questions
and answers 2026\2027 A+ Grade
Usable power depends on project conditions—primarily, haul-road surface condition, altitude, and
temperature. Underfoot conditions determine how much of the available power can be transferred to
the surface to propel the machine.
- correct answer true
The coefficient of traction can be defined as the factor by which the total weight of the equipment
should be multiplied to determine the maximum possible tractive force between the wheels or tracks
and the surface just before slipping will occur.
- correct answer false
Assume that a rubber-tired tractor has a total weight of 25,000 lb on its driving wheels. The maximum
rimpull in low gear is 9,000 lb. If the tractor is operating in wet sand, with a coefficient of traction of
0.30, what is the maximum possible rimpull prior to slippage of the tires? (See Example 6.5 in the
textbook for reference)
- correct answer 7500 lb
Continue with the previous question, will this tractor slip on this surface?
- correct answer yes
Assume that a rubber-tired tractor has a total weight of 25,000 lb on its driving wheels. The maximum
rimpull in low gear is 9,000 lb. If the tractor is operating in wet sand, with a coefficient of traction of
0.60, what is the maximum possible rimpull prior to slippage of the tires?
- correct answer 15000 lb
Continue with the previous question, will this tractor slip on this surface?
- correct answer no
, A wheel tractor scraper is used on a road project. When the project begins, the scraper will experience
high rolling and grade resistance at one work area. The rimpull required to maneuver in this work area is
65,000 lb. In the fully loaded condition, 48% of the total vehicle weight is on the drive wheels. The fully
loaded vehicle weight is 189,360 lb. Please calculate how much weight is on the drive wheels. (See
Example 6.6 in the textbook for reference)
- correct answer 90,893 lb
Continue with the previous question, what minimum value of coefficient of traction between the
scraper wheels and the traveling surface is needed to maintain maximum possible travel speed?
- correct answer .72
Dozer is good for applications of less than 300ft short haul, and scraper is good for applications of up to
3,000ft medium haul.
- correct answer true
An advantage of a crawler dozer as compared with a wheel-type dozer is higher speed.
- correct answer false
Which of the following work tasks can be performed by a dozer?
- correct answer all of the above
The ________________ is very effective for side-casting material, particularly for backfilling or making
sidehill cuts.
- correct answer angle blade
______________ is a technique whereby the blade end spillage from the first pass or the sidewalls from
previous cuts are used to hold the material in front of the dozer blade on subsequent passes.
- correct answer slot dozing
Which of the following factors need to be considered when selecting a proper scraper for your project?
- correct answer all of the above
and answers 2026\2027 A+ Grade
Usable power depends on project conditions—primarily, haul-road surface condition, altitude, and
temperature. Underfoot conditions determine how much of the available power can be transferred to
the surface to propel the machine.
- correct answer true
The coefficient of traction can be defined as the factor by which the total weight of the equipment
should be multiplied to determine the maximum possible tractive force between the wheels or tracks
and the surface just before slipping will occur.
- correct answer false
Assume that a rubber-tired tractor has a total weight of 25,000 lb on its driving wheels. The maximum
rimpull in low gear is 9,000 lb. If the tractor is operating in wet sand, with a coefficient of traction of
0.30, what is the maximum possible rimpull prior to slippage of the tires? (See Example 6.5 in the
textbook for reference)
- correct answer 7500 lb
Continue with the previous question, will this tractor slip on this surface?
- correct answer yes
Assume that a rubber-tired tractor has a total weight of 25,000 lb on its driving wheels. The maximum
rimpull in low gear is 9,000 lb. If the tractor is operating in wet sand, with a coefficient of traction of
0.60, what is the maximum possible rimpull prior to slippage of the tires?
- correct answer 15000 lb
Continue with the previous question, will this tractor slip on this surface?
- correct answer no
, A wheel tractor scraper is used on a road project. When the project begins, the scraper will experience
high rolling and grade resistance at one work area. The rimpull required to maneuver in this work area is
65,000 lb. In the fully loaded condition, 48% of the total vehicle weight is on the drive wheels. The fully
loaded vehicle weight is 189,360 lb. Please calculate how much weight is on the drive wheels. (See
Example 6.6 in the textbook for reference)
- correct answer 90,893 lb
Continue with the previous question, what minimum value of coefficient of traction between the
scraper wheels and the traveling surface is needed to maintain maximum possible travel speed?
- correct answer .72
Dozer is good for applications of less than 300ft short haul, and scraper is good for applications of up to
3,000ft medium haul.
- correct answer true
An advantage of a crawler dozer as compared with a wheel-type dozer is higher speed.
- correct answer false
Which of the following work tasks can be performed by a dozer?
- correct answer all of the above
The ________________ is very effective for side-casting material, particularly for backfilling or making
sidehill cuts.
- correct answer angle blade
______________ is a technique whereby the blade end spillage from the first pass or the sidewalls from
previous cuts are used to hold the material in front of the dozer blade on subsequent passes.
- correct answer slot dozing
Which of the following factors need to be considered when selecting a proper scraper for your project?
- correct answer all of the above
