# C - 14 CURRICULUM FOR AUTOMOBILE ENGINEERING

## ENGINEERING MECHANICS

### Subject Code                         :           A-105

Periods/Week                                :           04

# TIME SCHEDULE

S No.
Major Topics
No. of  Periods
##### Essay
Type
Questions
1
Statics
16
06
10
16
2
Friction
16
06
10
16
3
Dynamics
14
03
10
13
4
Simple machines
20
03
20
23
5
16
06
10
16
6
Transmission of power
28
06
20
26

Total
120
30
80
110

OBJECTIVES
Upon completion of the course the student shall be able to

1.0          Understand the concept of Statics
1.1       Explain the meaning of mechanics in engineering.
1.2       State the importance of mechanics in engineering.
1.3       Review the system of units used.
1.4       Explain the concept of force
1.5       List the types of forces
1.6       Explain the force system
a) Co-planar and Non-Coplanar,
b) Parallel and Non-Parallel,
c) Like and Un like, d) Concurrent and Non-concurrent
1.7       Explain the concept of equilibrium
1.8       State the parallelogram law of forces
1.9       State the triangle law of forces
1.10     State the polygon law of forces
1.11     State the Lami’s theorem.
1.12     Explain the concept of free body diagram
1.13     Solve the problems involving concurrent coplanar forces
1.14     Solve simple problems involving non-concurrent coplanar forces
1.15     Solve simple problems using Lami’s theorem
1.16     Define the term couple and moment of couple with legible sketch.
1.17     Explain the properties of a couple
1.18     State the condition of equilibrium of a body acted upon by co-planar
forces.

2.0          Understand the concept of Friction
2.1       Explain the concept of friction
2.2       State the laws of friction
2.3       Identify the machine members in which friction exists and desirable
2.4       Resolve the forces acting on bodies moving on horizontal plane.
2.5       Resolve the forces acting on bodies moving along the inclined planes.
2.6       Solve the related numerical problems

3.0       Understand the concept of Dynamics
3.1       Define the terms Kinematics and Kinetics
3.2       Classify the motion types
3.3       Define the terms displacement, velocity and acceleration
3.4       State the Newton’s Laws of motion (without derivation)
3.5       Solve the problems related to the rectilinear motion of a particle
3.6       Explain the Motion of projectile
3.7       Solve the numerical problems
3.8       State the D’Alembert’s principle
3.9       Define the Law of conservation of energy
3.10     Explain the Work-Energy principle
3.11     Define the Law of conservation of momentum
3.12     Explain the Impulse –momentum equation
3.13     Solve the problems using the above principles
3.14     Explain the Rotary motion of particle
3.15     Define Centripetal force.
3.16     Define Centrifugal force.
3.17     Differentiate Centripetal and Centrifugal forces
3.18     Describe simple harmonic motion.
3.19     Explain the application of simple harmonic motion in engineering.

4.0       Comprehend the Principles involved in Simple Machines
4.1       Define the important terms of simple machines
a) Machine, b) Mechanical Advantage, c) Velocity Ratio, d) Efficiency.
4.2       Illustrate the use of three classes of simple lever.
4.3       Show that an inclined plane is a simple machine to reduce the effort in lifting loads.
4.4       Derive expression for VR in cases of wheel & axle, Weston Differential pulley blocks, pulleys, Worm & Worm wheel crabs, screw jack, rack & pinion.
4.5       Compute the efficiency of a given machine.
4.6       Compute effort required to raise or lower the load under given conditions.
4.7       Interpret the law of machine.
4.8       State the conditions for self-locking and reversibility.
4.9       Calculate effort lost in friction and load equivalent of friction.
4.10     Evaluate the conditions for maximum M.A.& Maximum efficiency.

5.0       Understand the concept of Basic Link mechanism
5.1       Define important terms of Basic link mechanism
a) Link, b) kinematics pair, c) Kinematic chain, d) Mechanism & machine
5.2       Explain kinematic pair and kinematic chain with the help of legible sketch
5.2       List examples for Lower and Higher pairs.
5.3       List examples of inversion.

6.0       Understand the concept of transmission of power in Engineering.
6.1    Identify various power transmitting media like belt, Chain, rope, gears.
6.2    Select suitable material for belt.
6.3    Explain the belt fasteners
6.4    Derive the expression for velocity ratio for a belt drive.
6.5    Explain the term slip in belt and its effect on velocity ratio.
6.6    Explain the combined effect of belt thickness and slip on velocity ratio.
6.7    Explain the use of jockey pulley.
6.8    Distinguish between open belt drive and cross belt drive.
6.9    Explain the tensions in tight and slack sides of a belt.
6.10  Calculate velocity ratio and power in belt drive.
6.11  Explain the rope drive state the advantages and limitations.
6.12  Explain the chain drive state the advantages and limitations.
6.13  Explain the types of chain.
6.14  Explain the principle of gear drive state the advantages and limitations.
6.15  Classify the gears.
6.16  Explain Nomenclature of gear
6.17  Discuss the simple and compound gear train.
6.18  Explain the applications of the above drives in engineering.
.

COURSE CONTENT
1.0          Statics
1.1          The meaning of word mechanics.
1.2          Application of Mechanics to Engineering.
1.3          System of Units.
1.4          Definition and specification of force
1.5          System of  forces
1.6          Resolution of force
1.7          Equilibrium and Equilibrant.
1.8          Statement of Parallelogram law of forces, triangle law of forces, polygon law of forces and Lami’s theorem
1.9          Drawing the free body diagram
1.10       Numerical problems related to concurrent coplanar forces
1.11       Couple and moment of a couple
1.12       Condition for equilibrium of a rigid body subjected to number of coplanar non-concurrent forces.
1.13       Related Numerical problems

2.0       Friction
2.1       Definition of static friction, dynamic friction and impending friction
2.2       laws of solid and liquid friction
2.3       Derivation of limiting angle of friction and angle of repose
2.4       Resolution of Forces considering Friction when a body moves on horizontal plane.
2.5       Resolution of Forces considering Friction when a body moves on   inclined plane.
2.6       Numerical examples on the above cases

3.0       Dynamics
3.1       Defination of Kinematics and Kinetics
3.2       Classification of motion
3.3       Defination of displacement, velocity and acceleration
3.4       Laws of motion (without derivation)
3.5       Solving the problems related to the rectilinear motion of a particle
3.6       Motion of projectile and solving the numerical problems
3.7       Newton’s laws of motion.
3.8       D’Alembert’s principle
3.9       Defination Law of conservation of energy
3.10     Work-Energy principle
3.11     Law of conservation of momentum
3.12     Impulse –momentum equation
3.13     Solving the kinetic problems using the above principles
3.14     Rotary motion of particle and laws of motion
3.15     Definition and Differentiate Centripetal and Centrifugal forces.
3.16     Simple harmonic motion.
3.17     Definition of the terms frequency, time period, amplitude and circular frequency
3.18     SHM equation, natural frequency
3.19     Simple problems on SHM

4.0       Simple Machines
4.1       Definition of Simple machine, and uses of simple machine, levers
and inclined plane.
4.2       Fundamental terms like mechanical advantage, velocity ratio and efficiency.
4.3       Expressions for VR in case of Simple/Differential pulley/pulleys of 3 systems, Worms and Worm wheel, Rack and pinion, Winch crabs, &Screw jack.
4.4       Conditions for reversibility and self locking.
4.5       Law of Simple Machine.
4.6       Effort lost in friction, Load Equivalent of Friction Max. M.A. and Max. efficiency.

5.1       Definition of terms: link, kinematic pair, kinematic chain,
Mechanism, structure and machine.
5.2       Quadric cycle chain and its inversions.
5.3       Slider Crank chain and its inversion.
6.0       Transmission of power:
6.1       Belt drive, Materials for the belt drive and belt fasteners.
6.2    (a) Explanation of the terms.
i)Velocity ratio, in terms of diameters of pulleys.
ii)Slip, percentage of slip and its effect on velocity ratio.
iii)Thickness of belt and its effect on velocity ratio.
iv)Tight side and slack side of the belt.
(b) Open belt and cross belt drive.
(c) Effective tension (T1 – T2).
(d) Velocity of the belt and Power transmitted by belt
(e).Problems –Velocity ratio, slip and power transmitted In a belt      drive.
6.3        Rope drive – Advantages and limitations over a belt drive.
6.4      Chain drive – Advantages and limitations over a belt drive.
6.5       Types of chains.
6.6       Gears and Gear trains
a)Nomenclature of gear
b)Types of gears – spur, helical, bevel, and spiral.
c)Simple and compound gear trains.
d)Velocity ratio in gear drive processes and problems.
e)Advantages and limitations gear drive over a belt drive.
REFERENCE BOOKS:

1          Basic Mechanical Engineering           by        V.N Kumar
2          Elements of Mechanical engineering by         Roy & Choudary
3          Engineering Mechanics          by        Singer                          B.S.Publications
4          Engineering Mechanics          by        Basudeb Bhattacharya – Oxford Publishers
5          Engineering Mechanics          by        A Nelson          Mc Graw Hill Publishers
7          Engineering Mechanics          by        R.S.Khurmi                 S.Chand & Comp
8          Theory of Machines                by        S.S.Rathan                 TMH P
9          Theory of Machines                by        R.S. Khurmi
10        Theory of Mechanisms and Machines by   Malik & Ghoshe

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