Đề thi tuyển dụng vào canon đề cơ khí

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