RTU 2016 Question Paper Semester IV Automobile Engineering Kinematics of Machines

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t,{ B.Tech. IV-Sem (Main & Back) Examl June-July 2016
!t Automobile Engineering
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\t 4AE1A Kinematics of Machines
AEO ME

Time: 3 Hours Maximum Marks: 80
Min. Passing Marks (Main & Back): 26
Min. Passing Marks (OId Back): 24
Instructions to Canili.date s : -

Attempt any ftve questions, selecting one question from each unit. All
Questions carry equal marks. Schematic diagrams must be shown
wherever necessat)). Ary data you feel missing suitably be assumed and
stated clearly.
Units of quantities used/ calculated must be stated clearly.
use of following supporting material is permitted during examination.
(M entioned in form No.205 )

UNIT-I
Q.1 (a) Sketch and explain the various inversions of a double slider crank chain. t8l
(b) Draw and explain Klien's construction for determining the velocity and
acceleration of the piston in a slider crank mechanism. t8l
OR

Q.l An engine mechanism is shown in figure. The crank cB = 100mm and the connecting
rod BA = 300 mm with centre of gravity G, 100 mm from B. The crank shaft has a
speed of75 rad/s and an angular acceleration of 1200rad/s2. Find: l16l

l4E414o) Page 1 of4 [113401

(i) velocity of G and angular velocity of AB and

(ii) acceleration of G and angular acceleration of AB.

Q.2 (a) Derive an expression for the ratio of angular velocities of the shafts of a Hooke's
joint. Sketch a polar velocity diagram and mark it's salient feature. t8l

(b) What is the fundamental equation of steering gears? Derive the condition of
correct steering for Davis steering gear mechanism. t8l

OR

Q.2 (a) Draw and explain an overhead value mechanism of an LC. Engine. t8I

(b) Two shafts are connected by a universal joint. The driving shaft rotates at a

uniform speed of 1200 r,p.m. Determine the greatest permissible angle between

the shaft axes so that the total fluctuation of speed does not exceed 100 r.p.m.

Also calculate the maximum and minimum speeds of the driven qhaft. t8I

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friction torque considering both the theories for a flat collar.
t8l
(b) A load of 15kN is raised by means of a screw jack. The mean diameter of the
square threaded screw is 42mm and the pitch is l0mm. A force of 120
N is
applied at the end of a lever to raise the load. Determine
the length of the lever

to be used and the mechanical advantage obtained. Is the
screw self-locking?
Take pr = 0.t2. tgl
OR
Q'3 (a) Derive the condition for maximum power transmission by a belt drive
considering the effect of centrifugal tension.
tSl
(b) Determine the maximum power transmited by a v-belt drive having
the included
v - groove angle of 35". The belt used is l8mm deep with.lgmm maximum
width and weighs 300 gm. per metre length. The angle of
lap is 145o and the
maximum permissible stress is 1.5N/mm2 .Take
V = 0.2 t8l
UNIT-IV
Q'4 (a) A single plate clutch transmits 25kw at 900 r.p.m. The maximum pressure intensity
between the plates is 85 kN/m2. The.outer diameter
of the plate is 360 mm. Both
the sides of the plate are effective and the coefficient of
friction is 0.25.
Determine the (i) inner diameter of the plate (ii)
axial force to engage the
clutch.
i8l
(b) What is a Clutch? Make a sketch of a single plate clutch and
describe its
working.
t8l
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Q.4 (a) Show that in a band block brake, the ratio of the maximum and minimum
tensions in the brake straPs is :

To I t* ptanof'
Tn ll - Ptan9 )
-l

Where To = Maximum tension, Tn = Minimum tension 20 = angle subtended by
each block at the centre of the drum. t8l

(b) What is the different between absorption and transmission dynamometers?
Describe the construction and operation of a prony brake dynamometer' t8]

UNIT-V
Q.5 (a) How are the cams classified? Describe in detail' t8l

(b) Deduce expression for the velocity and acceleration of the follower when it
moves with simple harmonic motion' t8l

OR

e.5 Draw the profit of a cam operating a knife -edge follower having a lift of 30mm.
The

cam raises the follower with SHM for 150o of the rotation followed t'Y a Period
of

dwe1l for 60o. The follower descends for the next 100o rotation of the cam
with

uniform velocity, again followed by a dwell period. The cam rotates at a uniform
velocity of 120 r.p.m, and has a least radius of 20mm. What will be the maximum
velocity and acceleration of the follower during the lift and the return' t16l

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