Elements Of Electromagnetics
7th Edition
ISBN: 9780190698614
Author: Sadiku, Matthew N. O.
Publisher: Oxford University Press
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Transcribed Image Text: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.
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- 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.arrow_forwardQ3-a/ What are the characteristics of material which used for lining friction surfaces of a clutch? (5Marks) b/ An engine developing 45 kW at 1000 r.p.m. is fitted with a cone clutch built inside the flywheel. The cone has a face angle of 12.5° and a maximum mean diameter of 500 mm. The coefficient of friction is 0.2. The normal pressure on the clutch face is not to exceed (0.1 N/mm2). Determine: 1. The face width required, and 2. The axial spring force necessary to engage the clutch Answer question 4 or 5 (15 Marks) 15 Q4/ The areas of the turning moment diagram for one revolution of a multi-cylinder engine with reference to the mean turning moment, below and above the line, are - 32, + 408,-267, +333,-310, +226,- 374, + 260 and 244 mm². The scale for abscissa and ordinate are: 1 mm = 2.4° and 1 mm = 650 N-m respectively. The mean speed is 300 r.p.m. with a percentage speed fluctuation of± 1.5%. If the hoop stress in the material of the rim is not to exceed 5.6 MPa, determine the…arrow_forwardI need the answer as soon as possiblearrow_forward
- A multi-disk clutch consists of two steel disks with one bronze disk. Theinner and outer diameters of the contacting surfaces are 200 and 250 mmrespectively. The coefficient of friction is 0.1 and the maximum pressurebetween the contacting surfaces is limited to 0.4 N/mm2. Assuming uniformwear theory, calculate the required force to engage the clutch and the powertransmitting capacity at 720 rpmarrow_forwardi need the answer quicklyarrow_forwardQ1: A single plate clutch, effective on both sides, is required to transmit 25 kW at 3000 r.p.m. Determine the outer and inner radii of frictional surface if the coefficient of friction is 0.255, the ratio of radii is 1.25 and the maximum pressure is not to exceed 0.1 N/mm². Also, determine the axial thrust to be provided by springs. Assume the theory of uniform wear. Q2: A conical friction clutch is used to transmit 90 kW at 1500 r.p.m. The semi cone angle is 20° and the coefficient of friction is 0.2. If the mean diameter of the bearing surface is 375 mm and the intensity of normal pressure is not to exceed 0.25 N/mm², find the dimensions of the conical bearing surface and the axial load required.arrow_forward
- 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 beltarrow_forwardQ8 A multi-disk clutch consists of two steel disks with one bronze disk. The inner and outer diameters ofthe contacting surfaces are 200 and 250 mm respectively. The coeffi cient of friction is 0.1 and themaximum pressure between the contacting surfaces is limited to 0.4 N/mm. Assuming uniform weartheory, calculate the required force to engage the clutch and the power transmitting capacity at 720rpm.arrow_forwardA cone clutch has an angle of 12 dgrees and coefficient of friction of 0.42. Find the axial forcerequired if the capacity of the clutch is 8 KW at 500 rpm. The mean diameter of the active conicalsections is 300 mm. Use uniform wear method.arrow_forward
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