design problems coaching
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![Page 1: Design problems coaching](https://reader033.vdocuments.site/reader033/viewer/2022061201/547a0e1db4795968098b48ef/html5/thumbnails/1.jpg)
An ammonia compressor is driven by a 200kw motor. The compressor and the motor RPM are 380 and 1750, respectively. The small sheave has a pitch diameter of 152.4 mm. If the bolt to be used is standard C-120 (L = 122.9 in). Determine the center distance between sheaves.
Ans. 806 mm
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A safety valve spring having a 9 and 0.5 coils has the ends squared and ground. The outside diameter of the coil is 115 mm and the wire is 13 mm. It has a free length of the wire to which this spring must be initially compressed to hold a boiler pressure of 1.38 Mpa on the seat of 32 mm diameter. Modulus of rigidity is taken as G=80 GN/m2.
Ans. 172
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A single threaded trapezoidal metric thread has s a pitch of 4 mm, and a mean diameter of 18 mm.
Ans. 32.6 N-m
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Determine the diameter of the stud bolt that are required to fasten down the cylinder head of a 203mm x 304mm gas engine.
Ans. 38.1
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A single square thread power screw is to raise a load of 70 KN.
Ans. 12.526%
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Find the horsepower required to drive a power screw lifting a load of 4000 lbs.
Ans. 4.395 hp
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A flywheel has a mean diameter of 4 ft and is required to handle 2200 ft-lb of kinetic energy.
Ans. 334 lb
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Find the rim thickness for a cast iron flywheel with a width of 200mm, a mean diameter of 1.2 in a normal operating speed of 300 rpm,
Ans. 28.25
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A cast iron flywheel is rotated at a speed of 1200 rpm and having a mean rim radius of 1 foot.
Ans. 14, 700
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A centrifugal pump is directly couple to a motor. The pump rating is 3, 600 liters per minute against a total head of 8 meters of water.
Ans. 10, 010.85
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A 80 mm solid shaft is to be replaced with a hallow shaft of equal torsional strength.
Ans. 52.90%
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A solid transmission shaft is 4 inches in diameter.
Ans. 122.940
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A railroad track is laid at a temperature of 10 degree F with gaps of 0.01 feet between the ends of the rails.
Ans. 10409 psi
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What load P which causes total deformation of 0.036 inch of a steel rack with has a cross section area of 4 sq. inches and a length of 5 ft.
Ans. 72, 000
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What factor of safety is needed for a 2 inches diameter shaft with an ultimate strength of 50, 000 psi to transmit 40, 000 in-lb torque.
Ans. 2.62
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A round steel shaft transmits 373 watts at 1800 rpm. The torsional deflection is not to exceed 1 deg in a length equal to 20 diameters.
Ans. 6.53 mm
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A steel shaft operates at 186 rad/s and must handle 2 kw of power.
Ans. 11 mm
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A 100 mm diameter solid shaft is to be replaced with a hollow shaft equally strong (torsion) and made of the same material.
Ans. 107.42 mm
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If the weight of 6” diameter by 48” long SAE 1030 shafting is 174.5 kg then what will be the weight of chromium SAE 51416 of same size?
Ans. 347.96
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A 50” diameter diamond saw blade is mounted on a pulley driven steel shaft
Ans. 687.55
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A steel shaft transmits 40 hp at 1400 rpm.
Ans. 0.246 degrees/ foot
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A multiple disc clutch of 10 steel disc and 9 bronze disc.
Ans. 39.566 hp
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An engine of a motor vehicle with a wheel diameter of 712 mm develops 50 kw at 2000 rpm, the combined efficiency of the differential and transmission is 75% with an overall speed reduction of 25 is to 1. Determine the speed reduction of travel of the vehicle in km/ hr
Ans. 10. 74
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An engine of a motor vehicle with a wheel diameter of 712 mm develops 50 kw at 2000 rpm combined efficiency of the differential and transmission is 75% with an over all speed reduction to 1. Determine the torque to be delivered by the clutch N-m
Ans. 239 N-m
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The large diameter and face of the disk of a multiple disk clutch are 255mm and 25mm respectively.
Ans. 1, 688
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A flange bolt coupling consist of eight steel 20mm diameter steel bolts spaced evenly around a bolt circle 300mm in diameter.
Ans. 40054 KPa
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A flange coupling is to be designed, using 25 mm diameter bolts at a distance of 152 mm from the center of the shaft.
Ans. 5
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Warwick screw….
Ans. 140.8Ans. 4.418
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Notch Sensitivity….
Ans. 0.25
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