The following data relate to ascrew jack:Pitch of the threaded screw= 8 mmDiameter of the threaded serew= 40 mmCoefficient of friction between screw and nut =0.Load = 20 kNAssuming that the load rotates with the screwdetermine theratio of torques required to raise andlower the load(ii) efticiency of the machine,

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Answered: The following data relate to a screw…

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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Problem: A pump is driven by an electric motor through an open type flat belt drive. Determine the belt specificationsfor the following data.Motor pulley diameter= 400 mmPump pulley diameter = 800 mmCoefficient of friction for motor pulley = 0.30Coefficient of friction for pump pulley = 0.35Center distance between the pulleys=2000 mmRotational speed of the motor=2000 rpmPower transmission = 40kWdensity of belt material = 1000 kg/m3 width of the belt=240mmthickness of the belt = 5mm
Torsional coil springs in the clutch disc_a. cushion the driven disc engagement rear to frontb. are the mechanical force holding the pressure plate against the drivendisc and flywheelc. absorb the torque forcesd. are located between the friction rings
(8) A 5,000-lb gearbox is provided w/ a steel eyebolt for use of moving it. What should be the size of the eyebolt: (a) if UNC type is to be used? (b) if UNF type is to be used?
11 For the belt drive in Problem 10, what is the transmitted torque (in lbf"in) in the smaller pulley? Assume that both service factor Kg and safety factor nd are equal to 1.0. OA. 220 OB. 126 OC. 84 OD. 56 OE. None of the above
thick lnange be! The total torque required to turn the double threaded power screw is 55 N.m. If the screw turns at 285 rpm and the pitch of 4mm, find: A. The horsepower input of the power screw. B. The efficiency if the weight loaded is 10 kN.
A square thread power screw has pitch of 4-mm with double threads. Applicable data are threadand collar coefficient of friction equal to 0.08, collar diameter of 40-mm, and a load of 6.4-kNper screw and mean diameter of 30mmDetermine:a. Torques required to rotate the screw with” and “against” the load.b. Overall efficiency.
Torque required for achieving the tighting force
Q1/ A plate clutch having a single driving plate with contact surfaces on each side is required to transmit 110 kW at 1250 r.p.m. The outer diameter of the contact surfaces is to be 300 mm. The coefficient of friction is 0.4. (a) Assuming a uniform pressure of 0.17 N/mm? ; determine the inner diameter of the friction surfaces. (b) Assuming the same dimensions and the same total axial thrust, determine the maximum torque that can be transmitted and the maximum intensity of pressure when uniform wear conditions have been reach.
34 in 3. The following data apply to the C-clamp: a. The screw is ACME with ¾" Diameter b. Coefficient of thread friction = 0.12 c. Coefficient of collar friction = 0.23 d. Mean collar radius = 0.55 in. e. Max. clamping force = 1000 lb Determine: The tightening torque The operator force at the end of the handle (Note: Use table 8-3 to determine the screw pitch (p))
The factor of safety against slipping in the friction clutch = 1.3; coefficient of friction=0.4;working speed= 600 rpm; friction surface number= 2; required closing force= 712 N, clutch outerIf diameter = 300 mm, clutch inner diameter = 120 mm, how much power is transmitted?
A. PROBLEM ON TOPIC "KEYS AND COUPLINGS": A coupling with material AISI C1045 as rolled transmits 65.5 HP at 1750 rpm. The material of the 1.75 inch shaft... is also AISI C1045 as rolled and the key is cold drawn AISI C1020. N= 2.5. Determine the following: 1. Size of bolt (dia.) if there are 6 bolts made of AISI C1045 as rolled at a bolt circle of 5 inches. Note: Select standard bolt diameter from AT14 of DOME by Faires (see Lecture on fasteners for this Table) Calculated Dia: Standard Size to use: 2. Required b and t if a flat or rectangular key is used: Answer: 3. Required length of key, if a flat or rectangular key is used: Note: Calculate for two type of stresses on key, then select your answer. Length Based on shear length Based on compression: Length to use: 4. Required bif a square key is used: Answer: 5. Required length of key, if a square key is used: Note: Calculate for two type of stresses on kev, then select your answer. Length Based on shear length Based on compression:…
(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

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