Q3 / A multi – plate clutch is to transmit 12 kW at 1500 r.p.m. The inner and outerradii for the plates are to be 50 mm and 100 mm respectively. The maximum axialspring forces is restricted to 1 kN. Answer the following questions1- The necessary number of pairs of surfaces isµ= 0.35 assumingconstant wear.2- The necessary number of pairs of surfaces isconstant pressure.3- The axial force ...µ= 0.18 assuming4- Percentage increase in forces is QI/ A shaft rotating at 120 r.p.m is supported in bearing A and B, 1.8 m apart, Abeing at the left – hand end. Two unbalanced rotating masses of 7.5 kg and 10 kg atradii of 75 mm and 50 mm respectively are situated between A and B at distances of0.6 m and 0.9 m respectively from A. The angle between the radii is 60º when viewedalong the shaft. Answer the following questions:and ...1- The dynamic forces are2- Forces on bearings A and B due to dead weight areand3- Resultant force at A and B are..... and4- A rotor supported at A and B carries two masses. The rotor is(a) dynamically balanced (b) statically balanced (c) both (a)&(b) (d) none.5- The static balancing is satisfactory for low-speed rotors but with increasingspeeds, dynamic balancing becomes necessary. This is because, the(a) unbalanced couples are caused only at higher speeds(b) unbalanced forces are not dangerous at higher speeds(c) effects of unbalances are proportional to the square of the speed(d) effects of unbalances are directly proportional to the speed

P=12kw N=1500 rpm r0=100 mm ,ri=50 mm P=1kN Since P=2πNT60T=P×602πNT=12×602×π×1500T=76.394 N-m or…

Q3 / A multi – plate clutch is to transmit 12 kW at 1500 r.p.m. The inner and outer radii for the plates are to be 50 mm and 100 mm respectively. The maximum axial spring forces is restricted to 1 kN. Answer the following questions 1- The necessary number of pairs of surfaces is ..., µ= 0.35 assuming constant wear. 2- The necessary number of pairs of surfaces is constant pressure. µ= 0.18 assuming 3- The axial force ...

Q3 / A multi – plate clutch is to transmit 12 kW at 1500 r.p.m. The inner and outer radii for the plates are to be 50 mm and 100 mm respectively. The maximum axial spring forces is restricted to 1 kN. Answer the following questions 1- The necessary number of pairs of surfaces is ..., µ= 0.35 assuming constant wear. 2- The necessary number of pairs of surfaces is constant pressure. µ= 0.18 assuming 3- The axial force ...

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 multiple clutch has to transmit 90kW from an engine running at 3500 rpm. Clutch lining outer diameter is 200mm and inside diameter is 160mm. Spring pressure on clutch is 170kPa and it's coefficient of friction is 0.28. a)Calculate the minimum clamping force required b) Calculate the no. of clutch plates.
Example: An automotive single-plate clutch with twe of friction Surfaces, transmits a 300 N-m to- pairs rque at 1500 rp.m. The inner and outer diameters of the friction disck are 170 and 270 mm The cofficient of friction is 0-35. The normal for- ce on the friction Surfaces is exerted by nine helical Compre ssion springs, so that the clutch is always engia- ged. The clutch is dis engaged when the external force Further Compresses (5) and the number of ac Five Coile are (6) The are made of patented and Cold-drawn steel respectively. the springs. The spring index is Springs wires of minimum tensile Stmength (MTS) (N/mm?)as Wive dia. 1 1-21-4 1.6 1-8 2 2.53 3.6445567 MTS, 1900 i2601817e0175017201640 1570 I510 1480 440 139013201260 NI mr The permissible shear stress for the wire is 30%. of the ultimate tensile strength, and (G-81370 Nimn). Design the springs and specily their dimensisns. Use this relatian to obtaine to the total normal fore required to transmit the torque. F= 4T where Dis…
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