Question A3. The simple brake shown in Fig. A3 has wrap angle 220° and the rotating brake drum radius is 80 mm. A brake force of 90 N is applied via the cable and the coefficient of friction between the brake and the drum is 0.3. The moment of inertia of the rotating drum is 25 kg m³. (a) Calculate the brake torque generated, and (b) How long is the braking time from if the initial rotating speed is 120 rpm. Simple band brake for a minibike Su aon a Fig. A3

Question A3. The simple brake shown in Fig. A3 has wrap angle 220° and the rotating brake drum radius is 80 mm. A brake force of 90 N is applied via the cable and the coefficient of friction between the brake and the drum is 0.3. The moment of inertia of the rotating drum is 25 kg m³. (a) Calculate the brake torque generated, and (b) How long is the braking time from if the initial rotating speed is 120 rpm. Simple band brake for a minibike Su aon a Fig. A3

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

See similar textbooks

Similar questions

A bicycle and rider, travelling at 12 km/hr on a level road, have a mass of 105 kg. A brake is applied to the rear wheel, which is 800 mm in diameter. The pressure force on the brake is 80 N and the coefficient of friction is 0.06. Find the distance covered by the bicycle and the number of turns of its wheel before coming to rest.
In a band brake, the diameter of the drum is 8 inches, and the angle of wrap is 210 degree. With a coefficient of friction of 0.23, the band brake needs to generate a brake torque of 300 in-Ibf a) What is the ratio between the band forces P1 and P2? b) What is the difference between the band forces? c) Find the band forces P1 and P2.
While a vehicle with a mass of 2350 kg is moving at 120 km/h, suddenly braking It stops with an acceleration of -9.18 m/s2. There are two brake pads on each wheel of the vehicle. The friction coefficient between the brake pad and the brake disc is 0.3. During braking, assume 20 N/mm2 is the pressure on the brakke pad, find the area of the pad. Safety coefficient will be taken as 3
Example Problem #4 A disk brake has two pads which cover 45 degrees of the disk. The outside radius is 6.0 inch and the inside radius is 4.0 inch. Assume a coefficient of friction of 0.4, and a max pressure, pa-100 psi a) Find the force required to apply one pad. b) Find the torque capacity for both pads.
The torque exerted by a shaft in a Prony brake with an arm length of 1.85-feet and the scale reading of 250-lb of force.
A pile-driver hammer has a mass of 300 kg and is to be raised 16 m in 4 sec. The total friction on the guides is constant at 400 N. What constant pull must be exerted on the cable?
Two pulleys, one 650 mm diameter and the other 400 mm diameter, on parallel shafts 1.5 m apart are connected by a flat belt. Find the length of the belt required and the angle of contact between the belt and each pulley. What power can be transmitted by the belt when the larger pulley rotates at 1200 rev/min, if the maximum permissible tension in the belt is 10 kN, and the coefficient of friction between the belt and pulley is 0.05? give proper explaination and dont give handwritten solution.
Explain the laws of Static Friction.
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/mm², load factor is 2 and the mean diameter to face width ratio is 6.
A V-belt drives a pulley at a speed of 1440 m/min. The coefficient of friction between belt andpulley is 0.3, semi V-groove angle is 22.5o and angle of contact of belt with the pulley is 160o. Ifthe mass of the belt is 0.45 kg/m and if permissible pull in the belt is 800 N. Calculate the power.Consider the centrifugal tension in the belt.
A multiple V-belt drive is required to transmit 4 kW. The smaller pulley of the system is150 mm diameter, rotates at 200 rev/min, and has an angle of lap angle of 135°. Thegrove angle is 40° and the coefficient of friction between the belt and the pulleys is 0·3.If the maximum tension in any one belt is limited to 800 N, calculate:(a) The number of belts required. (b) The minimum tension in any one belt. (c) The required pre-tensioning of the belt. The centre-to-centre distance between the pulleys is 2 m.(d) Determine to the nearest mm, the required size for the larger pulley.(e) Find the approximate length of the belt
Two pulleys, one 650 mm diameter and the other 400 mm diameter, on parallel shafts 1.5 m apart are connected by a flat belt. Find the length of the belt required and the angle of contact between the belt and each pulley. What power can be transmitted by the belt when the larger pulley rotates at 1200 rev/min, if the maximum permissible tension in the belt is 10 kN, and the coefficient of friction between the belt and pulley is 0.05? dont write handwritten solution.