2. (15 pts) A plate clutch has a single friction surface 9-in OD by 7-in ID....
3. 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. (2 marks)
3. A multiple disc clutch has an outside diameter of 165 mm and inside diameter of 84 mm. The clutch material permits a maximum pressure of 262 kPa and has a coefficient of friction of 0.3. Determine (a) the actuating force, (b) the number of discs needed (c) actual maximum pressure, (d) Initially, the speed of driving side is 500 rpm and driven side is stationary. If the mass moments of inertia for driving side and driven side are 11-30...
Question 4 [25 marks] An electric motor drives a coaxial rotor through a single-plate clutch which has two pairs of driving surfaces each 300 mm external and 175 mm internal diameter. The variation of normal pressure with radius is given by a + b/r Pa and the maximum pressure is 150 kPa. The spring force on the system is 500 N. The mass of the motor armature and shaft is 750 kg and its radius of gyration is 240 mm;...
Question 5 A multi-disc friction clutch has to be desıgned to transmıt 75 kW from a motor running at 1440rev/mın The discs are to have an outer diameter of 200 mm and an ınsıde diameter of 150 mm Assume condıtion of uniform wear and that the maximum design pressure is lmited to 150 kPa Assume μ-0 25 (12) 5 1 Determine the necessary end thrust and the necessary number of plates After this clutch (from 5 1) in manufactured it...
1. A single-threaded ACME power screw has a major diameter d=1.25 in with a pitch of 0.2 in. The threaded coefficient of friction u is 0.2, and the coefficient of collar friction He is 0.15. The mean collar diameter de is 2 in. The external load on the screw is 1200 lb. Find: a) The torque required to raise the load. b) The maximum nominal shear stress of the screw body.
12 in Question S (15 pts): A plate of uniform thickness and density has a pin connection to the ground at point A. 9 in Using the existing coordinate system find the centroid of the a) b) Find the angle that the plate would rotate if hung from point A and c) Now find the alternate position of the circular hole (alternate value composite plate when s- 6 inches. indicate which direction it will rotate (CW or CCW). for s)...
about the vertical ()axis . (25 pts.) For the area shown, find the sentroidal moment of inertia a 9 in 9 in 3 in Centroid: 43n) 4 in 2 in 2 in (25 pts.) A 500 lb block rests on an incline as shown on the left. A cable joins it to a hanging weight W. The cable wrapstwofull turns around a cylinder plus the angle φ as shown on the right. Find the range of w for which the...
problem #4 #7 4. Problem A long wire is bent to form a rectangular section and is placed in a region with a uniform magnetic id, as shown in Fig ure 27.4. The magnetic field is directed downward and has a magnitude of 2.5T. The wire carries a 25- A current. Find the net torque on the wire about the z-axis. 025m 5. Problem Figure 29.2 shows a stationary current loop next to a long, straight wire carrying a current...
2. (25 pts) Engine oil flows with a velocity of 6 m/s over a flat plate having 1m length and 1 m width. The oil has a free stream temperature To= 80 °C and the plate surface temperature is maintained at Ts = 0 °C. a. Determine whether the flow over the plate transitions to turbulent regime. b. Calculate the average friction factor and the average heat transfer coefficient for the plate by using the appropriate correlations. c. Calculate the...
7. (15 pts) For the matrix A= -3 1 2 3 6 -2 - 4 -9 -1 1-7 2 3 -1 5 8 - 4 4 9 0 a) Use your calculator to place the matrix in RREF. b) Find a basis for the Range(A). c) Find a basis for Nul(A).