Assignment 3

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Concordia University *

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BLDG 6831

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Mechanical Engineering

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Feb 20, 2024

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pdf

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4

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10/30/23, 2:19 AM Assignment 3 (Posted Oct 25th) https://moodle.concordia.ca/moodle/mod/quiz/attempt.php 1/4 Home / My courses / BCEE-492-2232-UU / 22 October - 28 October / Assignment 3 (Posted Oct 25th) Question 1 Answer saved Marked out of 1.00 Question 2 Answer saved Marked out of 1.00 Question 3 Answer saved Marked out of 1.00 Regardless of the loading time and its conditions, the fixed time of a rear dump truck is always less than that of a bottom dump truck. Select one: True False Regardless of the loading conditions, the basic cycle time of articulated wheel loaders is always less than that of track loaders. Select one: True False For a loading & hauling operation in which 28 trucks are being used, the standby trucks must be: a. 6 b. 11 c. 8 d. 2 Clear my choice
10/30/23, 2:19 AM Assignment 3 (Posted Oct 25th) https://moodle.concordia.ca/moodle/mod/quiz/attempt.php 2/4 Question 4 Answer saved Marked out of 2.00 Estimate the hourly production of a Caterpillar 950GC with bucket capacity of 3.7 M excavating common earth (with max BFF) from a pit and moving it to a stockpile. The average haul distance is 100m one way, the effective grade is 15% and the job efficiency is 41 min/h. Answer: 111.25 3
10/30/23, 2:19 AM Assignment 3 (Posted Oct 25th) https://moodle.concordia.ca/moodle/mod/quiz/attempt.php 3/4 Question 5 Answer saved Marked out of 2.00 How many hours should it take for a Komatsu WA470-8 articulated wheel loader equipped with a 4.0-m bucket to load 2709 m of loam from a stockpile into rail cars if the average haul distance is 100 m one way? The area is level with RRF of 100 kg/t. Consider 35 min/h for the job efficiency. a. 27.82 b. 22.25 c. 23.42 d. 20.23 Clear my choice 3 3
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10/30/23, 2:19 AM Assignment 3 (Posted Oct 25th) https://moodle.concordia.ca/moodle/mod/quiz/attempt.php 4/4 Question 6 Answer saved Marked out of 3.00 NOTE: this question bears negative mark for each wrong answer equal to 1/2 mark of one right answer. A Caterpillar 325F-L hydraulic excavator is used to excavate various materials and load these materials into 8.7-BCM VOLVO dump trucks. The excavator production at 100% efficiency is already estimated as 228 BCM/h. The truck travel time is on average 8.5 min and its fixed cycle time without the loading time is 1.8 min. If the equipment costs for the excavator and one truck are $23/h and $55/h respectively and If both the job and management conditions are considered excellent, then: How many trucks are theoretically required to obtain maximum production? (select one of the three answer choices with no decimal places) What is the expected production of the loading and hauling process in bank measure based on these number of trucks? (select one of the three answer choices with one decimal places) what is the expected unit cost in $/BCM for this loading and hauling process? (select one of the three answer choices with two decimal places) a. 1.56 b. 1.55 c. 6 d. 5 e. 8 f. 191.5 g. 1.84 h. 174.1 i. 209.0 ◄ Loading and Hauling - Part 3 (Posted Oct 24th) Jump to...