The band brake of Fig.is used to control therotation of a drum. The coefficient of friction between thebelt and the 36° V-pulley is 0.15, and the weight of the han-dle is 15 N. If a force of 200 N is applied to the end of thehandle, determine the maximum torque for which no mo-tion occurs if the torque is appliedClockwise.150 mmT200 N60150 mm-675 mm75 mm

Given, Coefficient of friction, μ=0.15 Weight of the handle, W=15 N Applied force to the end of the…

Answered: The band brake of Fig. is used to…

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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is used to control the The band brake of Fig. rotation of a drum. The coefficient of friction between the belt and the drum is 0.35 and the weight of the handle is 15 N. If a force of 200 N is applied to the end of the han- dle, determine the maximum torque for which no motion occurs if the torque is applied Clockwise. 150 mm т 200 N 60° 150 mmi 675 mm 75 mm
A car has hydraulically operated disc brakes at the front and drum brakes at the rear. The frontbrakes have pistons of 58 mm diameter each, whereas each of the wheel cylinder at the rearbrake has 28 mm diameter. The master cylinder piston has diameter of 40 mm. The brake footpedal has a leverage of 4. If the brake pedal is applied a force of 100 N, Calculate (i) The brakingforce on the front axle, (ii) The braking force on the rear axle.
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The figure below shows the essential parts of a hydraulic brake system. The area of the piston in the master cylinder is 1.8 cm² and that of the piston in the brake cylinder is 6.4 cm2. The coefficient of friction between shoe and wheel drum is 0.50. If the wheel has a radius of 37 cm, determine the frictional torque about the axle when a force of 50 N is exerted on the brake pedal. N. m Wheel drum Pedal Shoe Master cylinder cylinder Brake
Couple forces of F= 35 N are applied to the handle of the machinist's vise. The guide at B is smooth. The single square-threaded screw has a mean radius of 6 mm and a lead of 8 mm , and the coefficient of static friction is μs= 0.27.
A multiple disc clutch has three discs on the driving shaft and two on the driven shaft, providing four pairs of contact surfaces. The outer diameter of the contact surfaces is 250 mm and the inner diameter is 150 mm. Determine the maximum axial intensity of pressure between the discs for transmitting 18.75 kW at 500 r.p.m. Assume uniform wear and coefficient of friction as 0.3.
Q1 Q5) Determine the principal dimensions of a cone clutch faced with lather to transmit 40 kW at 800 r.p.m. from an electric motor to an air compressor. Sketch a sectional front view of the clutch and provide the main dimensions. Assume that the semi-angle of the cone is 10°, the coefficient of friction is 0.3, mean diameter of cone is (7-10)d, where d is the diameter of the shaft, allowable normal pressure for lather and cast iron is 0.1 to 0.2 N/mm, shear stress 100 N/mm, load factor is 2 and the mean diameter to face width ratio is 6.
Machine Elements
A pulley with a diameter of 4 in. can rotate about a fixed shaft with a diameter of 2 in. The coefficient of static friction between the pulley and shaft is 0.20. Determine; a. the smallest vertical force P required to start raising a 500-lb load. b. thesmallest vertical force P required to hold the load. c. the smallest horizontal force P required to start raising the same load.
e g g a force of P =200 N which is applicd to the handle of the lever, if the coefficient of friction (= 0.3) and the pressure between band and flywheel is 0.15 MPa. Determine: 1. The torque (T) required for stopping the flywheel. 2. The width of the band. 3. The dimension AB for sclf-actuation. Page20f2
A simplified disk brake assembly is shown. A force F = 30 lb is applied to the lower end of the massless brake lever at a distance d from the lever’s pivot O. The brake is located L = 0.2 ft from O at the upper end of the lever, and the coefficient of friction between the brake and the disk is ? = 0.7. The disk has a weight and radius of W = 120 lb and R = 0.25 ft, respectively, and it is initially spinning at a constant ?o = 1000 rpm. What should d be if the disk is to come to a stop in Δ? = 1??
Two machines are coupled by means of a clutch plate with 2 contact surfaces. The plate has an inner diameter of 125 mm and an outer diameter of 200 mm and the coefficient of friction between mating surfaces is 0.35. It is assumed that shafts of both machines are co-axial and the driving shaft is rotating at a constant speed of 240 rev/min when it is suddenly brought in contact with the driven shaft/machine initially rotating at 20 rev/min. The Moment of Inertia of the driven machine is 21 kgm2. A slippage period of 6.8 sec is observed while the driven machine is brought to the full speed of the driving shaft. Analyse the frictional power transmission and calculate: The magnitude of the torque necessary to cause the described acceleration of the driven shaft :

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