KOM Two mark Question and Answers for all units

2mark Questions and Answers:    UNIT 1 - BASICS OF MECHANISMS

Part A questions:

1. What is Kinematics?

Kinematics is the study of motion (position, velocity, acceleration). A major goal of Understanding kinematics is to develop the ability to design a system that will satisfy Specified motion requirements. This will be the emphasis of this class.

2. What is Kinetics?

Kinetics is the study of effect of forces on moving bodies. Good kinematic design should produce good kinetics.

3. Define Link.

A link is defined as a member or a combination of members of a mechanism connecting other members and having relative motion between them. The link may consist of one or more resistant bodies. A link may be called as kinematic link or element. Eg: Reciprocating steam engine.

4. Define Kinematic Pair.

Kinematic pair is a joint of two links having relative motion between them. The types of kinematic pair are classified according to

^Ø  Nature of contact (lower pair, higher pair)

^Ø   Nature of mechanical contact (Closed pair, unclosed pair)

^Ø  Nature of relative motion (Sliding pair, turning pair, rolling pair, screw pair, spherical pair)

5. Define Kinematic Chain

When the kinematic pairs are coupled in such a way that the last link is joined to the first link to transmit definite motion it is called a kinematic chain.

Eg: The crank shaft of an engine forms a kinematic pair with the bearings which are fixed in a pair, the connecting rod with the crank forms a second kinematic pair, the piston with the connecting rod forms a third pair and the piston with the cylinder forms the fourth pair. The total combination of these links is a kinematic chain. Eg: Lawn mower. 

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KOM unit-4 Notes - Gear Terminologies

Gear Terminology

Addendum:

The radial distance between the Pitch Circle and the top of the teeth.

Arc of Action:

That arc of the Pitch Circle between the first point of contact between gear teeth and the last.

Arc of Approach:

That arc of the Pitch Circle between the first point of contact between gear teeth and the the Pitch Point.

Arc of Recession:

That arc of the Pitch Circle between the Pitch Point and the last point of contact between gear teeth.

Backlash:

Play between mating teeth.

Base Circle:

The circle from which is generated the involute curve upon which the tooth profile is based.

Center Distance:

The distance between centers of two gears.

Chordal Addendum:

The distance between a chord, passing through the points where the Pitch Circle crosses the tooth profile, and the tooth top.

Chordal Thickness:

The thickness of the tooth measured along a chord passing through the points where the Pitch Circle crosses the tooth profile.

Circular Pitch:

Inches of Pitch Circle circumference per tooth.

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UNIT I BASIC OF MECHANISMS - Hand Written Notes

 UNIT I       BASIC OF MECHANISMS
Terminology and Definitions – Degree of Freedom Mobility – Kutzbach criterion – Grashoff’s law
– Kinematic Inversions of 4 – bar chain and slider crank chains – Mechanical Advantage –
Transmission angle – Description of common Mechanisms – Single, double and offset slider
mechanisms – Quick return mechanisms Ratchets and escapements – Indexing Mechanisms –
Rocking Mechanisms – Straight line generators – Design of Crank – rocker Mechanisms.

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KOM 2 Mark Question & Answers

1.       Define Kinematics

Kinematics is the branch of classical mechanics that describes the motion of points, bodies (objects) and systems of bodies (groups of objects) without consideration of the causes of motion.

2.       Define Synthesis and Analysis

Synthesis is the design and facbrication of different parts of mechanism.

Analysis is the study of motions and forces concerning different parts of a mechanism.

3.       Define Mechanism

A mechanism is a device designed to transform input forces and movement into a desired set of output forces and movement. Mechanisms generally consist of moving components such as gears and gear trains, belt and chain drives, cam and follower mechanisms, and linkages as well as friction devices such as brakes and clutches, and structural components such as the frame, fasteners, bearings, springs, lubricants and seals, as well as a variety of specialized machine elements such as splines, pins and keys.

4.       Define a Machine

A machine is a mechanism or a combination of mechanisms which apart from imparting definitive motions to the parts also transmits and modifies the available mechanical energy into some kind of desired work.

5.       What is a rigid body?

Rigid bodies have no distortion,i.e,. the distance between any two points on it remain constant under the action of forces.

6.       What is a resistant body?

These bodies are normally flexible, but on loading becomes rigid.

7.       Define Link.

A resistant body or a group of resistant bodies with rigid connections preventing their relative movement is known as link. Link is a kinematic element.