8/31/26, 3:12 PM Quiz: Machine Power and Equipment Selection: ENGV380: Project and Construction Management (B03)
Quiz: Machine Power and Equipment Selection
Due Jun 29 at 11:59pm
Points 30
Questions 4
Time Limit 60 Minutes
This quiz is no longer available as the course has been concluded.
Attempt History
Attempt Time Score
LATEST Attempt 1 9 minutes 30 out of 30
() Correct answers are hidden.
Score for this quiz: 30 out of 30
Submitted Jun 26 at 6:59pm
This attempt took 9 minutes.
Incorrect
Question 1
7.5/7.5pts
A 3-cy wheel loader will be used to load trucks from a quarry stockpile of processed
aggregates having a maximum size of 1/4 in. The haul distance will be negligible. The
aggregate has a loose unit weight of 2,950 Ib per cu yd. Estimate the loader production in
tons based on a 50-min hour efficiency factor. Use an aggressive cycle time and fill
factor.
467 ton per hour
Incorrect
Question 2
7.5/ 7.5pts
A wheel-type tractor-pulled scraper having a combined weight (tractor and scraper) of
172,000 is push-loaded down a 6% slope by a crawler tractor whose weight is 106,000 Ib.
What is the equivalent gain in loading force for the tractor and scraper resulting from
loading the scraper down slope instead of up slope?
33360 Ib
https://canvas.liberty.edu/courses/1026043/quizzes/4769846?module_item_id=105618485 1/2
Quiz: Machine Power and Equipment Selection
Due Jun 29 at 11:59pm
Points 30
Questions 4
Time Limit 60 Minutes
This quiz is no longer available as the course has been concluded.
Attempt History
Attempt Time Score
LATEST Attempt 1 9 minutes 30 out of 30
() Correct answers are hidden.
Score for this quiz: 30 out of 30
Submitted Jun 26 at 6:59pm
This attempt took 9 minutes.
Incorrect
Question 1
7.5/7.5pts
A 3-cy wheel loader will be used to load trucks from a quarry stockpile of processed
aggregates having a maximum size of 1/4 in. The haul distance will be negligible. The
aggregate has a loose unit weight of 2,950 Ib per cu yd. Estimate the loader production in
tons based on a 50-min hour efficiency factor. Use an aggressive cycle time and fill
factor.
467 ton per hour
Incorrect
Question 2
7.5/ 7.5pts
A wheel-type tractor-pulled scraper having a combined weight (tractor and scraper) of
172,000 is push-loaded down a 6% slope by a crawler tractor whose weight is 106,000 Ib.
What is the equivalent gain in loading force for the tractor and scraper resulting from
loading the scraper down slope instead of up slope?
33360 Ib
https://canvas.liberty.edu/courses/1026043/quizzes/4769846?module_item_id=105618485 1/2
