PESIT-Bangalore South Campus
Hosur Road, (1K.M. Before Electronic City), Bangalore – 560 100
DEPARTMENT OF MECHANICAL ENGINEERING
SCHEME AND SOLUTION - I INTERNAL TEST
Subject
:
Sub. Code
:
Name of the faculty :
KINEMATICS OF MACHINES
10ME44
Azharuddin Kazi
Semester:IV
Section:B
Q.No
1
Marks
Define the Following
a) Machine b) Mechanism c) Structure d) Link e) Degrees of freedom.
Machine---- Defined as a mechanism or combination of mechanisms which apart from
imparting motion to the parts also transmits and modifies the available mechanical energy in
some kind of desired work
Kinematics---- Deals with the relative motion of diff parts of mechanism without considering
the forces to know the displacement, Velocity and acceleration of a part of a mechanism
Link----- it is a resistant body that constitutes a part of a machine connecting other parts which
have motion relative to it.
10
Q2
Find the D.O.F, of the following mechanisms shown below.
N=7, L=2, P2=0
P1= N+ (L-1) = 8
F = 3(N-1)-2P1-P2
F = 2 Mechanism with constrained motion
N=5, L=1, P2=1
P1= N+ (L-1) = 5
F = 3(N-1)-2P1-P2
F = 1 Mechanism with constrained motion
N=7, L=2, P2=1
P1= N+ (L-1) = 8
F = 3(N-1)-2P1-P2
F = 1 Mechanism with constrained motion
10
Q3
With a neat sketch explain the working of With worth Quick return Mechanism.
This mechanism is made of a driving crank and of a driven slider crank. In the
considered configuration, the fixed pivot of the driven crank is located on the
outside of the circle on which the end of the driving crank moves. This leads to an
alternated motion of the slider crank. The configuration where this pivot is located
inside the circle on which the end of the driving crank moves is considered in
The angular speed of the driven crank is variable. The duration of the motion for its
part corresponding to the blue arc is shorter than the one related to the red arc. This
is why this device is named quick return mechanism, which was used in crank
shapers, with the slow part or the stroke being used for the working time of the tool
and the quick part for the non-productive time
10
Q-4
With a neat sketch explain the working of Crank and slotted lever mechanism.
10
Q.No
Q5
Marks
With a neat sketch explain the working of Pentograph
A pantograph (Greek roots παντ- "all, every" and γραφ- "to write", from their original use for
copying writing) is a mechanical linkage connected in a manner based on parallelograms so
that the movement of one pen, in tracing an image, produces identical movements in a second
pen. If a line drawing is traced by the first point, an identical, enlarged, or miniaturized copy
will be drawn by a pen fixed to the other. Using the same principle, different kinds of
pantographs are used for other forms of duplication in areas such as sculpture, minting,
engraving and milling.
Because of the shape of the original device, a pantograph also refers to a kind of structure that
can compress or extend like an accordion, forming a characteristic rhomboidal pattern. This
can be found in extension arms for wall-mounted mirrors, temporary fences, scissor lifts, and
other scissor mechanisms such as the pantograph used in electric locomotives and trams
10
Q.No
Q-6
Marks
Derive an expression for fundamental equation of correct stearing.
10
Q.No
Q7
(A)
Marks
Explain working of Elliptical trammel with neat sketch
10
Q.No
Q-8
Marks
With a neat sketch wxplain the working of Drag link quick return mechanism.
10