CM250 EXAM 2 QUESTIONS
AND CORRECT ANSWERS
(ALREADY GRADED A+)
(Refer to graph) A hauler is loaded to its maximum weight
capacity. It travels down a section 2,500 ft long with a 275 ft
drop in elevation. The rolling resistance on the section is 5%.
Using the given brake-retarder curve, what is its expected
maximum (not average) speed on that leg? - correct
answer- 8mph
(Refer to graph) The basic cycle time for your loader is 0.48-min.
The operator stays at her task and seldom dismounts to do
anything else. The fairly small, 8-ton dump trucks of the
operation are all separately owned, and their beds are barely
larger than the loader's 4.5-cy bucket. The loaded material is up
to 3mm in size. Bucket fill factor for the sand-gravel mix is 80%.
The variable time averages 0.25min from workface to truck,
loaded, and 0.20min from truck to workface, empty. Efficiency is
expected to be 72%. What will be the loader production rate?
Loader Production = (60/loader cycle time (min)) x loader bucket
volume
Loader Cycle time = loader cycle time/efficiency factor -
correct answer- 218 lcy/hr
, A level 1 CPM display ____ (select all correct) - correct
answer- Should be developed during the bidding phase of
the project
Offers enough detail to connect project, day-by-day ?
Should be expected to include the project start date,
completion date, and the most critical milestones
Before construction can begin, it is necessary to do an initial
construction site visit in order to __________. - correct
answer- Look for any existing obstructions to be removed
from the site
Between Average Life Investment, ALI, and Average Annual
Investment, AAI, methods which we did say tends to better
capture actual costs for equipment interest, taxes, and insurance
from year to year? - correct answer- AAI
Construction signs should be well-placed around the site. They
are intended to _______. (Select all correct) - correct
answer- Warn visitors and site staff of possible hazards
AND CORRECT ANSWERS
(ALREADY GRADED A+)
(Refer to graph) A hauler is loaded to its maximum weight
capacity. It travels down a section 2,500 ft long with a 275 ft
drop in elevation. The rolling resistance on the section is 5%.
Using the given brake-retarder curve, what is its expected
maximum (not average) speed on that leg? - correct
answer- 8mph
(Refer to graph) The basic cycle time for your loader is 0.48-min.
The operator stays at her task and seldom dismounts to do
anything else. The fairly small, 8-ton dump trucks of the
operation are all separately owned, and their beds are barely
larger than the loader's 4.5-cy bucket. The loaded material is up
to 3mm in size. Bucket fill factor for the sand-gravel mix is 80%.
The variable time averages 0.25min from workface to truck,
loaded, and 0.20min from truck to workface, empty. Efficiency is
expected to be 72%. What will be the loader production rate?
Loader Production = (60/loader cycle time (min)) x loader bucket
volume
Loader Cycle time = loader cycle time/efficiency factor -
correct answer- 218 lcy/hr
, A level 1 CPM display ____ (select all correct) - correct
answer- Should be developed during the bidding phase of
the project
Offers enough detail to connect project, day-by-day ?
Should be expected to include the project start date,
completion date, and the most critical milestones
Before construction can begin, it is necessary to do an initial
construction site visit in order to __________. - correct
answer- Look for any existing obstructions to be removed
from the site
Between Average Life Investment, ALI, and Average Annual
Investment, AAI, methods which we did say tends to better
capture actual costs for equipment interest, taxes, and insurance
from year to year? - correct answer- AAI
Construction signs should be well-placed around the site. They
are intended to _______. (Select all correct) - correct
answer- Warn visitors and site staff of possible hazards
