TIME PERIOD: 60 MINUTES CADIDATE NO.: ME CHANICAL EXAMINATION Mechanical Subigct Examinatien Question 1 There are 2 parts A, B with spec as Figure 1.a, 1.b. They will assemble as on Fig l.a (1) Please calculate value of X2 (nominal dimension) and Xr ( tolerance) X2=?; Xt=! (2) When fit A into B, what is the maximum and the minimum value of the play? Ymax= ?; Y min = ? Question2 Please caculate the total length (Lx) when ** Self-weieht of spring are ignored ** Shape and size of the weight is ignored. Spec of Spring: Spring A: Natural length La:50mm Strech/Shrinkage rate : 1mm/g Spring B: Natural length L6:60mm Strech/Shrinkage rate : 4mml g Qugstion 3 There is a mass drop fuom Sm height to floor as show in figure 3 Coefficient of restitution(e) is 0.55 Caculate the hish of rising: L = ? Frg. La Fig. 1.b weight(7g) is connected as figure 2. Fis.2 then bound up 28+0.1 Fig. 1.a Fig. 3 Question 4 There is a pulley system as show in figure 4' Ignore weight of string and pulley; Friction force Please caculate: 1. Tension force R? 2. Load on Floor F? Question 5 Plate A and B are joined. The plate supported by the rotation free fulcrum A Plate A: Thicknese =1cml Density: 0.03 kglcm3 Fis.4 as below. Plate B: Thicknese =lcm; Density: 0.05 kglcm3 When the longer edge is kept at horizontal direction. How much is the upper direction force F at point B ? Question 6 Draw solid form (3D) for below part" Point B 1Ocm <Vi du> H i \ i i ' a/ trlP {Tr F 20cm 20cm Plate A Fulcrum A . supported by the rotation free fulcrum A Plate A: Thicknese =1cml Density: 0.03 kglcm3 Fis.4 as below. Plate B: Thicknese =lcm; Density: 0.05 kglcm3 When the longer edge is kept. height to floor as show in figure 3 Coefficient of restitution(e) is 0.55 Caculate the hish of rising: L = ? Frg. La Fig. 1.b weight(7g) is connected as figure 2. Fis.2 then bound