Kinematics of Machine Components

Question 1

It is a device that transforms one motion into another

Answer 1

Mechanism

Question 2

Mechanisms which transmit
substantial forces, applying power, or
changing its direction.

Answer 2

Machine

Question 3

When generated forces are associated
with the conversion of energy of high
temperature fluids to shaft power.

Answer 3

Engine

Question 4

an assemblage
of rigid bodies coupled by mechanical
constraints such that there can be relative
motion between them

Answer 4

Mechanism

Question 5

Two main constituents of Mechanics

Answer 5

Statics and Dynamics

Question 6

Analysis of systems of rigid bodies
whose configuration is invariant with time

Answer 6

Statics

Question 7

Analysis of systems of rigid
bodies whose relative configuration
changes with time.

Answer 7

Dynamics

Question 8

The study of motion, without
considering the forces causing the motion:
position, orientation, displacement,
velocity, acceleration…

Answer 8

Kinematics

Question 9

Equates motions to the forces that
cause them.

Answer 9

Kinetics

Question 10

the distance
between every pair of points on the body is
constant during a motion)

Answer 10

Rigid body assumption

Question 11

A process whose output prescribes
the sizes, shapes, materials and arrangements of components so that the resulting mechanism
will perform the desired task.

Answer 11

Synthesis

Question 12

Techniques allowing for quantifiable evaluation of an existing, or proposed mechanism.

Answer 12

Analysis

Question 13

indicates a joint between two
links

Answer 13

Kinematic pair

Question 14

mechanical constraints imposed on the links.

Answer 14

Joints

Question 15

Kinematic pair that involves surface contact

Answer 15

Lower pair

Question 16

Those normally involving point, line, or curve contact

Answer 16

Higher pair

Question 17

Kinematic pairs are classified based on

Answer 17

1. Nature of contact
2. Nature of mechanical constraint
3. Nature of relative motion

Question 18

Under classification of kinematic pairs according to nature of contact

Answer 18

Lower pairs
Higher pairs

Question 19

Six types of lower pairs

Answer 19

Revolute or pin (R-Pair)
Prismatic pair (P-pair)
Helical pair (H-Pair)
Cylindrical (C-Pair)
Spherical (S-pair)
Planar pair (E-pair)

Question 20

Lower pair that is made up of two congruent
mating surfaces of revolution. It has one rotational DOF
about its axis.

Answer 20

Revolute Pair (R-Pair)

Question 21

Pair that is comprised of two congruent non-
circular cylinders, or prisms. It has one translational DOF

Answer 21

Prismatic pair (P-pair)

Question 22

Also called screw. This pair is consists of two congruent helicoidally surfaces whose elements are a convex screw and a concave nut. 1 translational or rotational DOF, coupled by the pitch S

Answer 22

Helical pair (H-pair)

Question 23

consists of mating convex
and concave circular cylinders. They can rotate relative to each other about their common axis, and translate
relative to each other in a direction parallel to the axis.
Hence the C-pair h

Answer 23

Cylindrical pair (C-Pair)

Question 24

consists of a solid sphere which exactly conforms with a spherical shell. They are
also called ball-joints. They permit three rotational
DOF about intersecting orthogonal axes.

Answer 24

Spherical S-pair

Question 25

German word for plane

Answer 25

Ebene

Question 26

special S-pair comprising two concentric spheres of infinite radius. They permit two orthogonal translations and one rotational DOF about an axis orthogonal to the plane of translation. They provide three DOF in total.

Answer 26

Planar (E-pair)

Question 27

If two links have a sliding motion relative to each other, they form a

Answer 27

Sliding pair

Question 28

When one link has a turning or revolving motion relative to the other, they constitute

Answer 28

Turning pair

Question 29

When the links of a pair have a rolling motion relative to each other, they constitute a

Answer 29

Rolling pair

Question 30

If two mating links have a turning as well as sliding motion between them, they form a

Answer 30

Screw pair

Question 31

When one link in the form of a sphere turns inside a fixed link, it is a

Answer 31

Spherical pair

Question 32

The relative motion is pure translation as in a reciprocating cam activating a knife-edge or mushroom head follower, or the finger tip of a robot hand sliding on a at surface.

Answer 32

Pure sliding

Question 33

The relative motion involves rolling without slip, such as the tangential pitch circles or mating sets of spur gears, or rack and pinion system

Answer 33

Pure rolling

Question 34

A body which is if under the action of forces, it does not suffer any distortion.

Answer 34

Rigid body

Question 35

Those which are rigid for the purpose they have to serve

Answer 35

Resistant bodies

Question 36

Which are normally flexible, but under certain loading conditions act as rigid body for the limited purpose.

Answer 36

Semi-rigid body

Question 37

Kinematic Pairs according to Relative Motion

Answer 37

Sliding Pair Turning pair Rolling pair Screw pair Spherical pair Pure sliding Pure Rolling Combination of Sliding and Rolling

Question 38

When the elements of a pair are held together mechanically, they are

Answer 38

Closed pair

Question 39

When two links of a pair are in contact either due to force of gravity or some spring action,

Answer 39

Unclosed pair

Question 40

defined as the number of independent relative motions both translational and rotational.

Answer 40

Degrees of freedom

Question 41

A resistant body or a group of resistant bodies with rigid connections preventing their relative movement is known as

Answer 41

Link

Question 42

an assembly of links in which the relative motions of the links is possible and the motion of each relative to the other is definite.

Answer 42

Kinematic chain

Question 43

does not allow any motion of a link relative to the other.

Answer 43

Redundant chain

Question 44

If motion of any of the movable links results in definite motions of the others the linkage is known as

Answer 44

Mechanism

Question 45

If one of the links of a redundant chain is fixed, it is known as

Answer 45

Structure