Principal Mechanical Problems Paper I have principal mechanical assignmentand I need solution for the tasksdetails in pictures TASK-1 Moment of Inertia (se
Principal Mechanical Problems Paper I have principal mechanical assignmentand I need solution for the tasksdetails in pictures TASK-1
Moment of Inertia (second moment of area) is an important property in engineering. We have to
specify or determine the moment of Inertia in order to analyze or design a structural member or a
mechanical part. Figure shows a composite area.
(i) Determine the location of the centroid from bottom edge PQ.
(10 marks]
(ii) Determine the total moment of inertia of the section about the line PQ. [20 marks)
(iii) Determine the total moment of inertia of the section about the centroid of the section.
[20 marks]
Take the values from table 1.
Equilateral triangle of side b3 mm
VC
Hollow Circle of external diameter
d2 mm internal diameter d4 mm
Р
Q
Rectangle b1 mm X d1 mm
Table 1
Rectangle – Rectangle
length b1 in mm width d1 in mm
External diameter Internal diameter side of
of hollow circle d2 of hollow circle equilateral
in mm
d4 in mm
triangle b3 in
mm
142
15
275
13
60
TASK-2
A cantilever pin jointed frame is shown in figure with four members AB, BC, CD and BD. By using
graphical method (vector method), Perform the following:
(i) Draw the free body diagram marking all dimensions and angles.
[10 marks]
(ii) Draw the neat space diagram by taking suitable scale
[10 marks]
(iii) Determine the magnitude and nature of forces (compressive or tensile) in all the
members
(15 marks]
(iv) Tabulate your result.
[5 marks)
Take the values (a, b, c and F) from table 2.
B
с
e
02
с
F KN
Table 2
a in m
bin m
c in m
F in KN
0.3
0.4
4.3
3
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