8/31/26, 3:13 PM Quiz: Final: ENGV380: Project and Construction Management (B03)
Quiz: Final
Due Jul 10 at 11:59pm
Points 100
Questions 10
Time Limit 90 Minutes
This quiz is no longer available as the course has been concluded.
Attempt History
Attempt Time Score
LATEST Attempt 1 61 minutes 96 out of 100
(@ Correct answers are hidden.
Score for this quiz: 96 out of 100
Submitted Jul 5 at 5:21pm
This attempt took 61 minutes.
Question 1
6/10pts
A 7-cy wheel loader will be used to load a crusher from a quarry stockpile of blasted rock
(average breakage) 180 ft away. The rock has a loose unit weight of 2,700 Ib per cu yd.
Estimate the loader production in tons based on a 50-min hour efficiency factor.
Your Answer:
Given
e Bucket size =
» Material = blasted rock, average breakage
e | oose unit weight =
e Haul distance =
o Efficiency =
e Use average fill factor =
* Use average fixed cycle time =
e | oaded speed =
e Empty return speed =
Bucket volume per cycle
Weight per bucket load
https://canvas.liberty.edu/courses/1026043/quizzes/4769860?module_item_id=105618588 1/8
, 8/31/26, 3:13 PM Quiz: Final: ENGV380: Project and Construction Management (B03)
Travel time loaded
Return time empty
Total cycle time
Cycles per effective hour
Loader production
You correctly used the 82.5% bucket fill factor, calculated 5.775 cubic yards per cycle,
converted the bucket load to 15,592.5 Ib or approximately 7.80 tons, and correctly
applied the 50-minute effective hour. However, the loaded and empty travel speeds were
not the required operating speeds from the equipment table. Using 5.5 mph and 10 mph
produced an underestimated cycle time and an overestimated production of 336.2
tons/hr. You also omitted the tipping-load check. The expected production is
approximately 247 tons/hr.
Question 2
10/ 10 pts
Why is gap graded aggregate not acceptable?
Your Answer:
Gap-graded aggregate is unacceptable because it does not have a consistent range of particle
sizes. In a good concrete mix, smaller particles fill the spaces between bigger particles, resulting in
a thick and stable combination. When some intermediate particle sizes are lacking, the aggregate
particles do not pack tightly.
https://canvas.liberty.edu/courses/1026043/quizzes/4769860?module_item_id=105618588 2/8
Quiz: Final
Due Jul 10 at 11:59pm
Points 100
Questions 10
Time Limit 90 Minutes
This quiz is no longer available as the course has been concluded.
Attempt History
Attempt Time Score
LATEST Attempt 1 61 minutes 96 out of 100
(@ Correct answers are hidden.
Score for this quiz: 96 out of 100
Submitted Jul 5 at 5:21pm
This attempt took 61 minutes.
Question 1
6/10pts
A 7-cy wheel loader will be used to load a crusher from a quarry stockpile of blasted rock
(average breakage) 180 ft away. The rock has a loose unit weight of 2,700 Ib per cu yd.
Estimate the loader production in tons based on a 50-min hour efficiency factor.
Your Answer:
Given
e Bucket size =
» Material = blasted rock, average breakage
e | oose unit weight =
e Haul distance =
o Efficiency =
e Use average fill factor =
* Use average fixed cycle time =
e | oaded speed =
e Empty return speed =
Bucket volume per cycle
Weight per bucket load
https://canvas.liberty.edu/courses/1026043/quizzes/4769860?module_item_id=105618588 1/8
, 8/31/26, 3:13 PM Quiz: Final: ENGV380: Project and Construction Management (B03)
Travel time loaded
Return time empty
Total cycle time
Cycles per effective hour
Loader production
You correctly used the 82.5% bucket fill factor, calculated 5.775 cubic yards per cycle,
converted the bucket load to 15,592.5 Ib or approximately 7.80 tons, and correctly
applied the 50-minute effective hour. However, the loaded and empty travel speeds were
not the required operating speeds from the equipment table. Using 5.5 mph and 10 mph
produced an underestimated cycle time and an overestimated production of 336.2
tons/hr. You also omitted the tipping-load check. The expected production is
approximately 247 tons/hr.
Question 2
10/ 10 pts
Why is gap graded aggregate not acceptable?
Your Answer:
Gap-graded aggregate is unacceptable because it does not have a consistent range of particle
sizes. In a good concrete mix, smaller particles fill the spaces between bigger particles, resulting in
a thick and stable combination. When some intermediate particle sizes are lacking, the aggregate
particles do not pack tightly.
https://canvas.liberty.edu/courses/1026043/quizzes/4769860?module_item_id=105618588 2/8
