I need expert handwritten solutions, don't use Artificial intelligence QUESTION 3 (20 marks)6mksa For a Screw Jack, state the mathematical expressions to determine the following parameters:(iii) Maximum Efficiency(i) Helix Angle (ii) Torque to lift loadb) An electric motor driven power screw moves a nut in a horizontal plane against a force of 75 kN at aspeed of 300mm/min. The screw has a single square thread of 6 mm pitch on a major diameter of 40Smksmm. The coefficient of friction at the screw threads is 0.1. Estimate power of the motor.c) The pitch of 50 mm mean diameter threaded screw of a screw jack is 12.5 mm. The coefficient offriction between the screw and the nut is 0.13. Determine the torque required on the screw to raise aload of 25 kN, assuming the load to rotate with the screw. determine the ratio of the torque required toraise the load to the torque required to lower the load and also the efficiency of the machine. 7mks

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Answered: QUESTION 3 (20 marks) 6mks a For a…

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 single-threaded power screw of square form is to raise a load of 90KN at the rate of 360mm/min. Other data are as follows: Nominal Diameter of screw = 36mm Pitch = 6mm Coefficient of thread friction = 0.1 Coefficient of collar friction = 0.08 Friction radius at collar= 30mm Determine the power input to the screw in kilowatts.
4 A double-threaded power screw with square threads pushes against a load of 3,641 N at a speed of 15 mm/s. The screw has a major diameter of 20 mm and a pitch of 3 mm. The frictional coefficient of the threads is 0.25, and collar friction is negligible. What is the rotational speed of the screw in units of revolutions per minute? Type your answer 2 points
Bearings Motor Spur gears Worm Bronze bushings - 2L 's C.I. Collar ´bearing 2 [ 's The press shown in the following figure has a rated load of 5000 Ibf. The twin screws have Acme threads, a diameter of 3 in, and a pitch of 1/2 in. Coefficients of friction are 0.05 for the threads and 0.06 for the collar bearings. Collar diameters are 5 in. The gears have an efficiency of 95 percent and a speed ratio of 75:1. A slip clutch, on the motor shaft, prevents overloading. The full-load motor speed is 1720 rev/min. (a) When the motor is turned on, how fast will the press head move? (b) What should be the horsepower rating of the motor?
(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
A car jack uses a single square-thread screw to raise a known load. The major diameter and pitch of the screw and the thrust collar mean diameter are known. Running friction coefficients are estimated. Find: (a) Estimate the efficiency of the jack for raising the load. (b) Estimate the power required to drive the screw at a constant 1 revolution per second. Schematic and Given Data: Load 50 kN
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An automotive-type clutch, as shown in Figure 18.2, has inside and outside diameters of 160 and 240 mm, respectively. Clamping force is provided by nine springs,each compressed 5 mm to give a force of 900 N when the clutch is new. The moldedfriction material provides a conservatively estimated coefficient of friction of 0.40when in contact with the flywheel and pressure plate. Maximum engine torque is280 N # m.(a) What is the safety factor with respect to slippage of a brand new clutch?(b) What is the safety factor after “initial wear” has occurred?(c) How much wear of the friction material can take place before the clutch will slip (assuming no change in coefficient of friction)?
A single square-thread screw has an input power of 3 kW at a speed of 1 rev/s. The screw has a diameter of 40 mm and a pitch of 8 mm. The frictional coefficients are 0.16 for the threads and 0.09 for the collar, with a collar friction diameter of 50 mm. Find the axial resisting load Fand the combined efficiency of the screw and collar if the screw is raising the load. The axial resisting load Fis |kN. The combined efficiency of the screw and collar is %.
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8. Design a clamp coupling for transmitting 25 kW at 300 rpm. Allowable shear stresses in shaft and key are 50 MPa and 45 MPa, respectively. The number of bolts joining the two halves of muff is 4. The permissible tensile stress in the bolt is 70 MPa and the permissible crushing stress in the key is 90 MPa. The coeffi cient of friction between the muff of the CI and the shaft of steel is 0.20.
4. A 9-tooth sprocket operating at 200rev/min drives a 23-tooth sprocket. The pitch of this chain is 41.4 mm and the ultimate strength is 9.34 kN. Calculate the average linear speed, recommended maximum power and average torque applied to the drive shaft at recommended power.
6. Design a clamp coupling for transmitting 36 kW, at 200 rpm. Allowable shear stress in shaft is 45 MPa, allowable shear stress in key is 40 MPa, and allowable crushing stress in key is 90 MPa. The number of bolts joining the two halves is 4. The permissible tensile stress in bolts is 60 MPa. The coefficient of friction between the muff and shaft can be taken as 0.25

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