CM 2113 EXAM 2 WANG 2026 Exam UPDATED
EXAM ACTUAL LATEST VERSIONS 110
QUESTIONS AND CORRECT VERIFIED
ANSWERS WITH RATIONALES (100%
CORRECT) A+ GRADED ASSURED
1 bank cubic yard is 1 cubic yard of material after it has been disturbed by a loading process. -
CORRECT ANSWER: FALSE
A fully loaded CAT 621G scraper is operating on a site with a flat surface, assuming the
coefficient of traction to be the OSHA minimum required 0.5, the operating weight of the
empty scraper is 73,789lb, and the rated maximum load capacity of the scraper is 52,800 lbs,
when it is fully loaded, 55% of the weight is carried by the driving gear. Please calculate the
maximum usable force in this situation. - CORRECT ANSWER: VW= 73789 + 52800 = 126589
lbs
Maximum usavle force= CoT * weight on powered gear
= 0.5*(55%*126589) = 34811.975 lbs
A fully loaded Caterpillar 775F Off-Highway Truck must travel down a 4% slope on loose
sand and gravel surface to dump the dirt, and return empty through the same slope route. You
obtain the following information from the manufacturer's data:
Empty Weight: 154,000 lbs
Fully loaded weight: 294,000 lb
a. What is the total rolling resistance (lb) when traveling down the slope with fully loaded?
We assume the tire penetration is known as 3.5 inches. Please use the equation that includes
tire penetration for calculation.
b. What is the total rolling resistance (lb) when returning up the slope with the empty vehicle?
, Please use the rolling assistance factor from the reference table below to solve this problem.
For this problem, we assume the truck has high-pressure rubber tires, and use the average
number of the factor range you find out. - CORRECT ANSWER: A.) 294000/2000 = 147 tons
40+ (30 * 3.5)= 145 lbs/ton
145 * 147 = 21315 tons
B.) 154000/2000 = 77 tons
260- = 275
275 lbs/ton * 77 tons = 21175 lbs
a. What is the percent swell for the soil?
b. What is the percent shrinkage for the soil after being compacted?
c. How many bank cubic yards should be stockpiled to be used for the backfill operation?
d. How many truckloads of excess material should be hauled off-site if the trucks are fully
loaded to their heaped capacity? - CORRECT ANSWER: D.) 3000-950 = 2050 BCY
Vl= Vb*(1+swell) = 2050 *(1+0.22)= 2501 LCY
Truck load = 2501 /30 = 83.37; therefore 84 trucks needed
altitude limits power - CORRECT ANSWER: if equipment works at higher alts, where the air is
less dense, the engine may produce at a reduced power output
Bank soil condition - CORRECT ANSWER: material in its natural state before disturbance
(natural place); used for performing quantity take offs
C. What is the total grade resistance (lb) for both traveling down the slope and returning up
the slope?
d. What is the total resistance (lb) for both traveling down the slope and returning up the slope?
e. What is the total effective grade (%) for both traveling down the slope and returning up the
EXAM ACTUAL LATEST VERSIONS 110
QUESTIONS AND CORRECT VERIFIED
ANSWERS WITH RATIONALES (100%
CORRECT) A+ GRADED ASSURED
1 bank cubic yard is 1 cubic yard of material after it has been disturbed by a loading process. -
CORRECT ANSWER: FALSE
A fully loaded CAT 621G scraper is operating on a site with a flat surface, assuming the
coefficient of traction to be the OSHA minimum required 0.5, the operating weight of the
empty scraper is 73,789lb, and the rated maximum load capacity of the scraper is 52,800 lbs,
when it is fully loaded, 55% of the weight is carried by the driving gear. Please calculate the
maximum usable force in this situation. - CORRECT ANSWER: VW= 73789 + 52800 = 126589
lbs
Maximum usavle force= CoT * weight on powered gear
= 0.5*(55%*126589) = 34811.975 lbs
A fully loaded Caterpillar 775F Off-Highway Truck must travel down a 4% slope on loose
sand and gravel surface to dump the dirt, and return empty through the same slope route. You
obtain the following information from the manufacturer's data:
Empty Weight: 154,000 lbs
Fully loaded weight: 294,000 lb
a. What is the total rolling resistance (lb) when traveling down the slope with fully loaded?
We assume the tire penetration is known as 3.5 inches. Please use the equation that includes
tire penetration for calculation.
b. What is the total rolling resistance (lb) when returning up the slope with the empty vehicle?
, Please use the rolling assistance factor from the reference table below to solve this problem.
For this problem, we assume the truck has high-pressure rubber tires, and use the average
number of the factor range you find out. - CORRECT ANSWER: A.) 294000/2000 = 147 tons
40+ (30 * 3.5)= 145 lbs/ton
145 * 147 = 21315 tons
B.) 154000/2000 = 77 tons
260- = 275
275 lbs/ton * 77 tons = 21175 lbs
a. What is the percent swell for the soil?
b. What is the percent shrinkage for the soil after being compacted?
c. How many bank cubic yards should be stockpiled to be used for the backfill operation?
d. How many truckloads of excess material should be hauled off-site if the trucks are fully
loaded to their heaped capacity? - CORRECT ANSWER: D.) 3000-950 = 2050 BCY
Vl= Vb*(1+swell) = 2050 *(1+0.22)= 2501 LCY
Truck load = 2501 /30 = 83.37; therefore 84 trucks needed
altitude limits power - CORRECT ANSWER: if equipment works at higher alts, where the air is
less dense, the engine may produce at a reduced power output
Bank soil condition - CORRECT ANSWER: material in its natural state before disturbance
(natural place); used for performing quantity take offs
C. What is the total grade resistance (lb) for both traveling down the slope and returning up
the slope?
d. What is the total resistance (lb) for both traveling down the slope and returning up the slope?
e. What is the total effective grade (%) for both traveling down the slope and returning up the
