A power shovel is fitted with an engine of 150 f.w.h.p. It operates on full load for 6 minutes followed by 8 minutes of idling at one-third power. Its hourly utilization is for 3 cycles. What is its utilization factor?
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- Q) In a production turning operation, the cylindrical workpiece is 375 mm lọng and 1,50 mm in diameter. Feed 0.30 mm/rev, and depth of cút 4.0 mm. What cutting speed múst be used tó achieve a machining time of 5.0 min? よ 。A direct-drive crawler tractor witha rated blade capacity of 12 LCY is being used to exchange the location of 2 different stockpiles by pushing the material from one stockpile to the other. The first stockpile consists of loose common earth and the second stockpile is hard clay. The distance between Stockpile 1 and Stockpile 2 is 250 ft. Estimate the production of the dozer if the job efficiency is 50 min/h.A drect-drive crawler tractor with a rated blade capacity of 12 LCY is being used to exchange the location of 2 different stockpiles by pushing the material from one stockpile to the other. The first stockple consists of loose common earth and the second stockpile is hard clay. The distance between Stockpile 1 and Stockpile 2 is 250 ft. Estimate the production of the dozer if the job efficiency is 50 min/h,
- A dash pot 10 cm diameter and 12.5 cm long slides vertically down in a 10.05 cm diameter cylinder the oil filling annular space has viscosity 0.8 poise. Find speed with which piston slides down if load on piston is 10 N. 10 cm 10 № 12.5 cmHW: Find the production rate of the wheel-tractor-mounted loader, using the following information: - Bucket capacity, 2.3 m' - Loose volume of handling material, 1480kg/m - Swell, 20% - Tractor operating factor, 52 min/hr - The unit is equipped with a torque converter and a power-shift transmission, having the following speed ranges, forward and reverse: speed ranges, forward and reverse (km/hr) Low range intermediate range 0-6 0-24 high range 0-48 When hauling a loaded bucket, the unit should travel at an average speed of about 80% of its maximum speed in the low range. When returning empty, the unit should travel at an average speed of about 40% of its maximum speed in the intermediate range for distances less than (40m), and at about 60% of its maximum speed in the same range for distances equal and more than (40m). - The fixed time (load, shift, turn and dump) is equal to 0.35 min. Note: Tabulate the results for two distances: 24m and 48m.3m CALCULATE THE NET Fix 37 Fiy Fey FIF 2X 1.5m 1. Sm 37 F2 P TORQUE ABOUT POINT P.
- Chapter 8 SCRAPER CYCLE TIME (See ppg. 236-244) Determine the cycle time for a single-engine scraper rated at 21 cy heaped that is used to haul material from a pit to a fill 900 ft away under severe conditions. The average haul speed will be 14 mph The average return speed will be 20 mph Assume, at an average speed of 5 mph that 200 ft is required to both accelerate and decelerate. The operating efficiency will be equal to a 50-min hour. It will take 0.80 min to load this scraper. distance,ft 88 conversion factor = = Time, min. speed,mph x 88 Distance, ft. Speed, mph Time, min Haul 200 accelerate 500 14 200 decelerate 5 Return 200 accelerate 500 20 200 decelerate Travel time Travel time min Load time Dump time (see table 8.7) Turn time fill| 0.21 Turn time cut 0.30 Total time minQ1/ Determine the reaction for The Con Beam due to settlement o(fomm) @ suppor B-uto using slope B C AF E दिय 8m E = 70 G Pa I = 800* 106m 8 m/ + 8A Lined charnel is shown in Pig. below with two slope sides 1:1 if the e hannel is deliver amo lece calkulete the dmen siore , velecity ,Speaic energy and total energ jand bule slope = 0-00025,n=0-015 .B=lom Am.
- Tractor weighs (20000 kg) and produces a maximum rimpull of (18160 kg) at sea level. the tractor is being operated at an altitude of (2445 m) on wet earth. Derating factor is اختر أحد الخيارات a. 21% O b. 15% O c. 0% O d. All choices are incorrect e. 100% O00 F10 F11 Y F12 Scr Lk PrtS C H V DURING A TEST OF A FRANCIS WHEEL HYDRO ELECTRIC POWERPLANT, THE POWER OUTPUT IS 4 MW AND THE VELOCITY IS 7.5 H/S. THE INSIDE DIAMETER OF THE PENSTOCK IS 3 FT, LENGTH IS 350 FT AND THE ELEVATMON OF THE CENTERLINE OF THE TUR- BINE NO2ZLE IS D FEET ABOVE THE TAILRACE HEADWATER ELEVA- TION 1300 FT, FRICTION FACTOR=0.4, EXIT VELOCITY IN THE PRAFT TUBE 1.6 FT/S IF THE OVERALL EFFICIENCYIS 80%,DETERMINE: • THE TALWATER ELEVATION IN FEET. •THE PRESSURE AT THE BASE OF THE NOZZLE IN PSI. MODULE ASSIGNMENT %3DA plant has installed a single suction centrifugal pump with a discharge of 68 m3/hr under 60 m head and running at 1200 rpm. It is proposed to install another pump with double suction but of the same type to operate at 30 m head`and deliver 90 m3/hr. What must be the impeller diameter of the proposed pump if the diameter of the existing pump is 150 mm?