13.64 The shaft shown in Sketch h transfers power betweenthe two pulleys. The tension on the slack side (right pul-ley) is 30% of that on the tight side. The shaft rotatesat 900 rpm and is supported uniformly by a radial ballbearing at points 0 and B. Select a pair of radial ball bear-ings with 99% reliability and 40,000 hr of life. AssumeEq. (13.83) can be used to account for lubricant clean-liness. All length dimensions are in millimeters. Ans.Cmin = 42,400 N. 376Zy500.400,0900 N200100 N500 diamBSketch h, for Problem 13.64600 diam

The tension in the 600mm diameter pulley can be determined from torque equillibrium:…

Answered: 13.64 The shaft shown in Sketch h…

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

ChapterMA: Math Assessment

Section: Chapter Questions

Problem 1.1MA

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A V-belt from a 10-in. diameter grooved pulley that rotates at 1800 rpm, up to a 36-in. diameter flat pulley. The distancebetween axes is 40” and the throat angle is 40°. The coefficient of frictionbetween the belt and the grooved pulley is 0.2 and with the flat pulley it is also 0.2. Thecross section of the belts is a trapezoid with parallel sides of 1.5” and 0.75”, witha height between them of 1”. The weight of this strap is 0.04 lbf/in3, and the maximumAllowable tension on each belt is 200 lbf. Determine: a) How many straps arethey need. b) The Torque applied in the transmission, c) The Transmitted power.
Find the greatest and smallest values of the velocity ratio of two shafts joined with a universal coupling when the axis are 30o. Produce a graph of velocity ratio against angle for f to proof the calculated results.
4.) A flat belt makes contact with an 18 in. diameter pulley through half its circumference. If the coefficient of friction is 0.45, and a torque of 350 ft-lbs is to be transmitted, calculate the belt tensions.
Find the greatest and smallest values of the velocity ratio of two shafts joined with a universal coupling when the axes are at 60o to each other. Produce a graph of velocity ratio against angle for ? to proof the calculated results.
6. The turning moment diagram for a four stroke gas engine may be assumed for simplicity to be repre- sented by four triangles, the areas of which from the line of zero pressure are as follows: Expansion stroke = 3550 mm²; exhaust stroke = 500 mm²; suction stroke = 350 mm²; and compres- sion stroke 1400 mm². Each mm² represents 3 N-m. Assuming the resisting moment to be uniform, find the mass of the rim of a flywheel required to keep the mean speed 200 r.p.m. within ± 2%. The mean radius of the rim may be taken as 0.75 m. Also determine the crank positions for the maximum and minimum speeds. [Ans. 983 kg; 4° and 176° from I. D. C]
A single cylinder vertical engine has a bore of 300 mm and a stroke of 400 mm.The connecting rod is 1000 mm long. The mass of the reciprocating parts is 140 kg.On expansion stroke with crank at 30° from the top dead centre, the gas pressure is 0.7 MPa. If the engine runs at 250 rpm, determine the net force on the piston,resultant load on the gudgeon pin, thrust on the cylinder walls and the speed above which other things remaining same, the gudgeon pin loads would be reversed in direction.
1. A bearing for an axial flow compressor is used to support a radial load of 2500 N and thrust loads of 1500 N. The service required for the bearing is 5 years at the rate of 40 hours per week. The speed of the shaft is 1000 rpm. Select suitable ball bearing for the purpose Diameter of shaft is 50 mm.
An overhang shaft carry a 900mm diameter pulley, whose center is 250mm from the center of nearest bearing. The weight of the pulley is 600N and the angle of lap is 180°.The pulley is driven by motor horizontally to right it, if the permissible tension in the belt is 2650N and the coefficient of friction between the belt and the pulley surface is 0.3, estimate the diameter of the shaft. Note, Neglect centrifugal tension and assume permissible tensile and shear stresses in the shaft as 84MPA and 68MPa respectively.
A three cylinder radial engine driven by a common crank has the cylinders spaced at120°. The stroke is 138 mm, length of the connecting rod is 252 mm andthe mass of the reciprocating parts per cylinder is 2.2 kg. Calculate the primary and thesecondary forces at crank shaft speed of 1500 rpm.
Q. The effective mean diameter of contact surfaces of a cone clutch is 76 mm. The semi-angle of the cone is 16 degree and the coefficient of friction is 0.3. Assuming uniform rate of wear, determine the torque required to produce slipping of the clutch, if the axial force applied is 200 N. The clutch connects an electric motor running at a uniform speed of 1200 r.p.m to a flywheel which is stationary. The moment of inertia of the flywheel is 0.25 kg-m2. Calculate the time required to attain the full speed and also the energy lost in slipping of the clutch.
A single threaded trapezoidal metric thread has a pitch of 4 mmand a mean diameter of 18 mm. It is used as a translation screwin conjunction with a collar having an outside diameter of 37mmand an inside diameter of 27 mm. The load is 400 kg and coefficientof friction is 0.3 for both threads and collar. Find:a. The collar torqueb. The required torque for threadc. The total torque
A 1" diameter line shaft, which is supported by frictionless pulleys at the ends, carries 2 pulleys. The 10" diameter driver pulley is driven in a counter-clockwise direction, and its belt tensions are 25 lbs and 56 lbs. The 2" diameter driven pulley has one of its belt tensions measured at 30 lbs. Calculate the missing belt tension.

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