Q2 /A belt drive consist of two V-belts in parallel, on grooved pulleys of the same size. The angle of the groove is 30. The cross-section area of each belt is 750 mm and u is 0.12. The density of the belt material is 1.2 Mg/m' and the maximum safe stress in the material is 7 MN/m. Answer the following questions 1- The centrifugal tension in belts is . . (a) increases power transmitted (b) decreases power transmitted (e) have no effect on power transmitted (d) increases power transmitted up to a certain speed and then decreases

Q2 /A belt drive consist of two V-belts in parallel, on grooved pulleys of the same size. The angle of the groove is 30. The cross-section area of each belt is 750 mm and u is 0.12. The density of the belt material is 1.2 Mg/m' and the maximum safe stress in the material is 7 MN/m. Answer the following questions 1- The centrifugal tension in belts is . . (a) increases power transmitted (b) decreases power transmitted (e) have no effect on power transmitted (d) increases power transmitted up to a certain speed and then decreases

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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Q2/ A belt drive consist of two V-belts in parallel, on grooved pulleys of the size. The angle of the groove is 30°. The cross – section area of each belt is 750 and u is 0.12. The density of the belt material is 1.2 Mg/m' and the maximun stress in the material is 7 MN/m?. Answer the following questions 1- The centrifugal tension in belts is (a) increases power transmitted (b) decreases power transmitted (c) have no effect on power transmitted (d) increases power transmitted up to a certain speed and then decreases
Q2/A belt drive consist of two V– belts in parallel, on grooved pulleys of the same size. The angle of the groove is 30°. The cross – section area of each belt is 750 mm? and u is 0.12. The density of the belt material is 1.2 Mg/m³ and the maximum safe stress in the material is 7 MN/m?. Answer the following questions 1- The centrifugal tension in belts is (a) increases power transmitted (b) decreases power transmitted (c) have no effect on power transmitted (d) increases power transmitted up to a certain speed and then decreases
(Q2) A pump is driven by an electric motor using an open type flat belt. Determine the width and length of belt for the following data: Power transmission = 15kW Rotational speed of the motor=1,440 rpm Motor pulley diameter = 250 mm Pump pulley diameter = 500 mm Coefficient of friction for motor pulley = 0.26 Coefficient of friction for pump pulley 0.22 Center distance between the pulleys = 1,200 mm Thickness of the belt = 5 mm Density of belt material = 1,000 kg/m? Allowable stress for the belt material = 2 MPa
Q1/ An open belt drive connected two pulleys 120 cm and 50 cm diameter on parallel shafts 4 m apart. The belt weights 0.9 kg/m length and maximum tension in it is not to exceed 2000 N. 0.3. The 120 cm pulley, which is the driver, runs at 200 rpm. Due to belt slip on one of the pulleys, the velocity of the driven shaft is only 450 rpm. Calculate the torque on each of the two shafts and power transmitted.
Q2/A pulley used to transmit power by means of ropes has a diameter of 3.6 metres and has 15 grooves of 45° angle. The angle of contact is 170° and the coefficient of friction between the ropes and the groove sides is 0.28. The maximum possible tension in the ropes is 960 N and the mass of the rope is 1.5 kg per metre length. What is the speed of pulley in r.p.m. and the power transmitted if the condition of maximum power prevail ?
Vrope B. OD f TA ro Vcart Alternate View of Spool (rope not shown) Known values: Ti TA To 0.75 ft 1.2 ft 1.7 ft 1 8 Problem Statement: A large spool rolls without slip on a cart. The cart's speed is 17 ft/s. A rope, which is wrapped around the spool's hub, is being pulled at a speed of 5 ft/s, as depicted. Determine: The angular velocity of the spool: i计 The velocity vector of point G: The velocity vector of point A: i+ Be sure to include units with your answers.
A motorcar front wheel brake system consists of a master cylinder with a diameter of 20 mm and a brake pedal with a mechanical advan- tage of 5:1. The master cylinder feeds four slave cylinders with 50 mm diameter pistons on the disc brake callipers. Each slave cylinder must be able to exert a maximum force of 6,25 kN. The isothermal bulk modulus of the fluid is 1,9 GPa, Calculate: (a) the force that must be applied to the pedal to apply the brakes. [1.000,38 N] (b) the distance the pedal must be moved to apply the brakes if the slaye cylinders must move 1 mm each. . (c) the play on the pedal due to compressi- bility of the fluid when the brakes are fully applied and the system has a total volume of 500 ml of fluid. [13,3 mm] (d) the play on the pedal due to compressi- bility in the system when the brakes are fully applied and 2 ml of air is present in the system. [125 mm] [36,06 mm]
Question 4 Squared & ground end A multi disc clutch, as illustrated below, is used to connect a four-cylinder internal combustion engine to a roll mill. The lining material is made of cast iron (Permissible pressure 1.725 MN/m) and friction coefficient of 0.06 running in oil. If the outer diameter of the plates is limited to 200mm and the inner diameter to 100mm, compare the maximum amount of power that can be transferred at 2500 rpm by using the a) principle of uniform pressure and b) uniform rate of wear. (16)
5. Arough rule for leather belt is that effective tension in it, shall not exceed 15 N/mm of width for a belt of 10 mm thickness. This rule is applied to determine width of belt required to transmit 37 kW, under the following conditions : Angle of lap = 165°; Coefficient of friction = 0.3; Velocity of belt = 1500 m/min; Density of leather = 950 kg/m³. Find the width of belt required. Assuming limiting friction between belt and pulley rim, find the stress in the belt. [Ans. 140 mm ; 1.48 MPa]
An electric elevator with a motor at the top has a multistrand cable weighing 8.4 lb/ft. When the car is on the first floor 270 feet of cable are paid out, and effectively 0 feet when the car is on the top floor. How much work does the motor do to lift an 1800 lb car and cable from the first floor to the top? Provide a picture model, give the approximate equation, then solve.
@ ll 65% 1:20 PM Edit 18 TREBLA Questian B2 The hydraulic cylinder shown in figure B2a exerts a force of 3 kN drected to the right on point Band to the left on point E. If the drum is required to rotate dockwise at a constant speed a. Copy and complete the free body diagram (figure B2b) by supplying the missing forces, moments, labels and dimensions. b. Detemine the magnitude of the couple M required to rotate the drum dockwise at a constant speed [5 marks] [10 marks) H,=0.40 H-0.30 D. 150'mm 150 mm E 300 mm 300 mm 150 mm 150 mm 250 mm Figure B2a 150 mm 300 mm 150 mm Figure B2b DO פם B8 W Tools Mobile View Share PDF to DOC 3
A 2 hp, 2500 rpm electric motor drives a machine through a flat belt. The driven shaft speed requirement equals 1000 rpm. Find a. The pitch line velocity b. The radius of the driven pulley r2 and the angle o wrap of the driving pulley c. The values of tension forces Fl and F2 Given: c- 25 in., rl - 1.5 in.,f-0.35, w=0.01 Ib/in.