CM 2113 Final Exam Latest 2025/2026 Review Questions
with verified Answers Complete Solution.
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.
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.
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):
7500 lb
Continue with the previous question, will this tractor slip on this surface?- :
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?:
15000 lb
Continue with the previous question, will this tractor slip on this surface?- :
No
1|Page
,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):
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?:
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.:
True
An advantage of a crawler dozer as compared with a wheel-type dozer is higher speed.:
False
Which of the following work tasks can be performed by a dozer?:
-Spreading -Striping –Backflling
The ________________ is very effective for side-casting material, particularly for backfilling or
making sidehill cuts.:
Angle blade
2|Page
, ______________ 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.:
Slot dozing
Which of the following factors need to be considered when selecting a proper scraper for your
project?:
-Scraper confguration -Volume of material -Job size
Please match the following three methods of pushing loading scrapers with their corresponding
diagrams?:
Back-track loading shuttle loading chain loading
Articulated trucks consist of two individual frames joined by pin, and can be easily operated over
soft ground.:
True
A contractor wants to investigate the production and cost differences of using a 4S blade on a
crawler-type dozer (D4H-4S). The material is dry clay and is to be moved a distance of 150 ft
from the beginning of the cut. The dozing is uphill on a 20% grade. The operator will have
average skill. The site conditions will be dark for visibility. The material weighs 108 pcf in the
bank state. Job efficiency is assumed to be equivalent to a 50-min hour. What is the operator
correction factor?:
75
A contractor wants to investigate the production and cost differences of using a 4S blade on a
crawler-type dozer (D4H-4S). The material is dry clay and is to be moved a distance of 150 ft
from the beginning of the cut. The dozing is uphill on a 20% grade. The operator will have
average skill. The site conditions will be dark for visibility. The material weighs 108 pcf in the
bank state. Job efficiency is assumed to be equivalent to a 50-min hour. What is the material-
weight correction factor? Assume the percent swell is 12%.:
88
3|Page
with verified Answers Complete Solution.
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.
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.
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):
7500 lb
Continue with the previous question, will this tractor slip on this surface?- :
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?:
15000 lb
Continue with the previous question, will this tractor slip on this surface?- :
No
1|Page
,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):
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?:
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.:
True
An advantage of a crawler dozer as compared with a wheel-type dozer is higher speed.:
False
Which of the following work tasks can be performed by a dozer?:
-Spreading -Striping –Backflling
The ________________ is very effective for side-casting material, particularly for backfilling or
making sidehill cuts.:
Angle blade
2|Page
, ______________ 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.:
Slot dozing
Which of the following factors need to be considered when selecting a proper scraper for your
project?:
-Scraper confguration -Volume of material -Job size
Please match the following three methods of pushing loading scrapers with their corresponding
diagrams?:
Back-track loading shuttle loading chain loading
Articulated trucks consist of two individual frames joined by pin, and can be easily operated over
soft ground.:
True
A contractor wants to investigate the production and cost differences of using a 4S blade on a
crawler-type dozer (D4H-4S). The material is dry clay and is to be moved a distance of 150 ft
from the beginning of the cut. The dozing is uphill on a 20% grade. The operator will have
average skill. The site conditions will be dark for visibility. The material weighs 108 pcf in the
bank state. Job efficiency is assumed to be equivalent to a 50-min hour. What is the operator
correction factor?:
75
A contractor wants to investigate the production and cost differences of using a 4S blade on a
crawler-type dozer (D4H-4S). The material is dry clay and is to be moved a distance of 150 ft
from the beginning of the cut. The dozing is uphill on a 20% grade. The operator will have
average skill. The site conditions will be dark for visibility. The material weighs 108 pcf in the
bank state. Job efficiency is assumed to be equivalent to a 50-min hour. What is the material-
weight correction factor? Assume the percent swell is 12%.:
88
3|Page
