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- Question: Each of the four silos seen in the figure has an empty weight of 30MN, and can hold up to 105 MN of grain. The weight of the mat is 55 MN. Since each silo is filled independently, the resultant load imposed on the mat does not necessarily act through the centroid. Evaluate the various loading conditions and determine whether centrally loaded, one-way eccentric loaded, and two-way eccentric loading requirements will be met. If these requirements are not met, determine the minimum mat width, B, needed to satisfy these requirements. Allowable bearing capacity is given as qa=265kPa). 50m 12,5m Plan 50m 12,5m Profile Mat foundationA belt conveyor is required to deliver crushed limestone having a bulk density of 75 lb/cu ft at the rate of 200 tons/hr. The conveyor is to be 200 ft between center of pulleys with a rise of 25 ft. The largest lumps are 4 in. and constitute 15% of the total. The conveyor will discharge over the end. For a belt speed of 200 fpm, what is the minimum width of belt that can be used? Calculate the horsepower for the drive motor.age ! Please round to the nearest One (i.e., 1). Calculate the compacted cubic yards per hour if a compactor with a 6 ft drum width travels at 4 miles per hour over a 6 in lift of aggregate base course with 3 passes required to meet density specifications. 1. Calculate the compacted cubic yards per hour = 2. Calculate the compacted cubic yards per hour at Poor operating conditions = Q A F1 2 W S F2 #3 20 E F3 D $ 4 000 000 R F % 5 AMA F5 T G MacBook Air A 6 * F6 Y & 7 H F7 * 00 8 F8 n Next page ▶▶ 9 UI U F9 K
- Calculate number of transit mixers (TM) required for transporting concrete from central batching plant to site. The cycle time data of a 6 m³ typical transit mixers is given below: O Loading time of TM = 6.0 minutes. O Travel time of loaded TM to site= 30 minutes. Average waiting time at site = 5.0 minutes Discharge time of concrete at site through concrete pump = 15 minutes. Travel time for return trip = 24 minutes. If the central batching plant having average output of 60 m³/hr is to run continuously, work out the requirement of no. of concrete pumps and TM.1. A certain material having a specific gravity of 3.52 in a 250 mL beaker was found to have weigh 484 g. What is the porosity of the material? a. 0.68 b. 0.38 c. 0.45 d. 0.29 2. The width of an apron conveyer with a capacity of 75 tons/hr and speed of 50 A. 220 mm B. 370 mm C. 070 mm D. 460 mm 3. The diffusivity of water in air at 10 deg. F and 1 atm in cm2/sec is A. 0.256 B. 0.273 C. 0.404 D. 0.581Two materials, A and B, are to be separated using two unit operations, 1 and 2. The feed has 10 tons/h A and 4 tons/h B. The split (fraction of material rejected by each operation) is given in Table P5-14. a. Which sequence of operations, (l?2) or (2?1), will yield the greatest recovery of material A? b. What will be the purity of material A using that sequence? c. What will be the efficiency of separation for the entire process train with regard to material A using the Worrell-Stesed equation?
- A 3-cy wheel loader will be used to load trucks from a quarry stockpile of processed aggregates having a maximum size of _ in. The haul distance will be negligible. The aggregate has a loose unit weight of 2,950 lb 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.A 32-cy wheel loader will be used to load trucks from a quarry stockpile of processed aggregates having a maximum size of in. The haul distance will be negligible. The aggregate has a loose unit weight of 2,900 lb/cy. Estimate the loader production in tons based on a 50-min-hour efficiency factor. Use an aggressive cycle time and fill factor.Please round to the nearest One (i.e., 1). Calculate the compacted cubic yards per hour if a compactor with a 4 ft drum width travels at 4 miles per hour over a 8 in lift of aggregate base course with 4 passes required to meet density specifications. 1. Calculate the compacted cubic yards per hour = 2. Calculate the compacted cubic yards per hour at Poor operating conditions Next page ge
- 11 er For sieves with openings smaller than 4.75 mm (No. 4), the quantity retained on any sieve at the completion of the sieving operation shall not exceed sieving surface area. he (kg/m^2) ofDetermine the magnitude of the resultant.Aggregates from a material storage site are required for the embankment of a roadway. The porosity of the aggregates at the storage is 75% and it is desired that these be compacted until a porosity of 20% is reached. The section of current interest for the embankment is 8m wide, 1.2m compacted thickness and 220m long. Compute the total cost if each truckload of aggregates to be transported will cost around 3550.00 and each truckload has a capacity of 7m3.