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Mechanical Subigct ExaminatienQuestion 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 t

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 = ?

F r g L a F i g 1 b

weight(7g) is connected as figure 2

Fis.2

t h e n b o u n d u p

2 8 + 0 1

F i g 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

1 O c m

<Vi du>

trlP

{Tr

F

20cm 20cm

Plate A

Fulcrum A