KINEMATICS OF MACHINERY

KINEMATICS OF MACHINERY                                                                         3  1  0 4

OBJECTIVE

·          To understand the concept of machines, mechanisms and related terminologies.

·          To analyse a mechanism for displacement, velocity and acceleration at any point in a moving link

·          To understand the theory of gears, gear trains and cams

·          To understand the role of friction in drives and brakes.

UNIT I             BASICS OF MECHANISMS                                                             7(L) Definitions – Link, Kinematic pair, Kinematic chain, Mechanism, and Machine. -Degree of  Freedom  –  Mobility  -  Kutzbach  criterion  (Gruebler’s  equation)  -Grashoff's  law- Kinematic Inversions of four-bar chain and slider crank chain - Mechanical Advantage- Transmission angle.

Description  of  common  Mechanisms  -  Offset  slider  mechanism  as  quick  return mechanisms, Pantograph, Straight line generators (Peaucellier and Watt mechanisms), Steering  gear  for  automobile,  Hooke’s  joint,  Toggle   mechanism,   Ratchets   and escapements - Indexing Mechanisms.

UNIT II            KINEMATIC ANALYSIS                                                            10(L)+5(T)

Analysis  of   simple   mechanisms  (Single   slider  crank   mechanism  and  four  bar mechanism) - Graphical Methods for displacement, velocity and acceleration; Shaping machine mechanism - Coincident points – Coriolis acceleration - Analytical method of analysis of slider crank mechanism and four bar mechanism.   Approximate analytical expression for displacement, velocity and acceleration of piston of reciprocating engine mechanism.

UNIT III           KINEMATICS OF CAMS 

U07ME402 – KINEMATICS OF MACHINERY

                                               

B.E/ B.TECH DEGREE EXAMINATION NOV/DEC 2011

FOURTH SEMESTER

MECHANICAL ENGINEERING

U07ME402 – KINEMATICS OF MACHINERY

Time:Three Hours                                                        Maximum Marks:100

Answer ALL Questions

PART-A (10X 1=10Marks)

1.Cam and follower is              type of pair.

a.Closed pair       b.Turning pair    c.Higher pair       d.Lower pair

2.Quick return motoin mechanism is the inversion of  chain

a.Four bar chain mechanism b.Single slider chain mechanism   c.Double slider chain mechanism                  d.All the above

3. How many instantaneous centres are possible in a four bar chain mechanism.

a.8     b.6    c.4     d.10

4. In a four bar chain mechanism ,number of binary joints

          a.Four        b.Six          c.Eight       d.Ten

5.In a radial cam,the follower moves in a dirction to the axis.

          a. Parallel   b.Perpendicular            c.Inclined            d.All the above

6.For high speed engines, the cam follower should move with

          a. Reciprocating motion       b.Ocillating motion     c.Cycloidal motion      d.None of the above

7.Two intersecting and coplanar shafts are connected by gears.

          a.Spur gear          b.Helical gear      c.Bevel gear        d.Worm and worm wheel

8.In watch mechanism wich type of gear train is used.

          a.Reverted gear train.   b.Simple gear train      c.Compound gear train          d.Epicyclic gear train

9.What is the S.I unit for frictional moment?

          a.N/m                   b.N-m/S     c.N-m/s²     d.N-m

10.Function of dynamometer is

a.To measure displacement            b. To measure velocity.       

c.To measure acceleration.               d.To measure driving forcr

(Answer ALL the questions)

PART B   (10X 2=20Marks)