B.E./B.TECH.DEGREE SECOND SERIES EXAMINATIONS, MARCH/APRIL –
2012
REGULATIONS 2008
SECOND SEMESTER
ME 2151 ENGINEERING MECHANICS
MECHANICAL ENGINEERING - B SECTION
Time:
Two Hours Date: 02.04.2012 Maximum:50
marks
ANSWER
ALL QUESTIONS
PART – A(10
x 1 =10 marks)
1. Define equilibrium and equilibrant.
2. Write the necessary and sufficient equations for equilibrium of spatial non concurrent and non parallel forces.
3. Define statically determinate and indeterminate beams.
4. What are the steps to be
followed in drawing free
body diagram?
5. Define Pappus & Guldinus theorems.
6. State
parallel axis theorem and perpendicular axis theorem.
7. State
D’Alembert’s principle.
8. State
the
difference between impulse and momentum
9. State
Laws of friction
10.Define
Angle of
Repose
PART – B(5 x 8 =40 marks)
11.Determine the tension in the
cables AB, AC
and
AD as shown in fig.
12.Calculate the
support reactions of the truss shown in fig.
13.Find the principal moment of inertia, Radius of Gyration and Polar Moment of Inertia of
the section shown in fig.
14.Two blocks of mass 20 Kg and 40 Kg are connected by a rope passing over a
frictionless pulley as shown in fig. Assuming the co-efficient of friction as
0.3
for all the
contacting surfaces, find the
tension in the
string,
acceleration of the
system. Also
compute the
velocity of the System after 4 seconds starting from rest using
a. D’Alembert’s principle
b. Work Energy method
c. Impulse Momentum Method
15.The ladder shown in Fig. is 6 m long and is supported by a horizontal floor and vertical wall. The coefficient of friction between the floor and the ladder is 0.35 and
that between the wall and the ladder
is 0.30. The weight of
ladder is 150 N and may be
considered as acting through mid-point. The ladder also supports
a vertical load
of 800
N at C which is at a distance of 1m from B. Determine the least value of α at which the ladder may be
placed without slipping. Determine the reactions at that stage.
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