Code No: R161216 R16 SET - 1
I B. Tech II Semester Supplementary Examinations, Nov/Dec - 2017
ENGINEERING MECHANICS
(Com. to CSE, IT, AGE)
Time: 3 hours Max. Marks: 70
Note: 1. Question Paper consists of two parts (Part-A and Part-B)
2. Answering the question in Part-A is Compulsory
3. Answer any FOUR Questions from Part-B
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
PART A
1. a) What is meant by limiting friction and impending motion? (2M)
b) State Lami`s theorem. (2M)
c) Distinguish between centroid and center of gravity. (2M)
d) Define product of inertia. (2M)
e) What are the differences between ``kinematics`` and ``kinetics``? (2M)
f) State the work-energy equation for translation. (2M)
g) When does a given system of parallel forces can be reduced to couple? Discuss. (2M)
PART -B
2. a) A system of four forces acting on a body is (7M)
shown in figure. Determine the resultant force
and its direction.
b) Two blocks A and B are resting against a wall (7M)
and the floor as shown in figure. Find the value
of the horizontal force P applied to the lower
block that will hold the system in equilibrium.
Coefficients of frictions are 0.25 at the floor, 0.3
at the wall and 0.2 between the blocks.
3. a) Two spheres each of 1000N and of radius 25cm (7M)
rest in a horizontal channel of width 90cm as
shown in figure. Find the reaction at the point of
contact A, B and C.
b) Determine the forces in the truss shown in the figure. (7M)
WWW.MANARESULTS.CO.IN
|''|'''||''||'''|||| 1 of 2
Code No: R161216 SET - 1
R16
4. a) Determine the area generated by rotating a line of length `l` about x-axis from a (7M)
distance `r` using Pappus theorem.
b) Find the centroid of the following (7M)
figure.
5. a) Determine the mass moment of inertia of a cylinder shaft of 100mm diameter and (7M)
2.5m height above the center of gravity axes. (Density,=8000kg/m3).
b) Determine moment of inertia of given section (7M)
about centroidal XX axis.
6. a) A tower is 90m height. A particle is dropped from the top of a tower and at the (7M)
same time another particle is projected upward from the foot of the tower. Both
the particles meet at a height of 30m. Find the velocity with which the second
particle is projected upwards.
b) A pulley of weight 400N has a radius of 0.6m. A (7M)
block of 600N is suspended by a rope wound
round the pulley as shown in figure. Determine
the resulting acceleration of the weight and
tension in the rope.
2 of 2
WWW.MANARESULTS.CO.IN
|''|'''||''||'''||||
Code No: R161216 R16 SET - 1
7. a) A ring weighing 350gm and a solid (7M)
cylinder weighing 450gm, both having
radius 110mm are given the same
velocity to roll towards the wall, as
shown in figure. If they start at the
same time, which one will hit the wall
earlier?
b) A train of weight 25,000kg is pulled by (7M)
an engine on a level track at a constant
speed of 54kmph. The frictional
resistance is 1kg per 100kg of the
weight of the train. Determine the
power of the engine. If the train is to
move with uniform acceleration of
1.2m/s2 on the track after attaining the
speed of 54kmph, determine the power
of the engine.
3 of 3
WWW.MANARESULTS.CO.IN
|''|'''||''||'''||||
