Lesson 1

Question 1

A study of relative motion of machine parts. Displacement, velocity amd acceleration are considered.

Answer 1

Kinematics of machines

Question 2

__________ treats with the forces acting on the parts of a machine and the motions resulting from these forces.

Answer 2

Dynamics of machines

Question 3

A device for transforming or transferring energy.

Answer 3

Machine

Question 4

Sometimes defined as consisting of a number of fixed and moving bodies interposed between the source of power and the work to be done for the purpose of adapting one to the other.

Answer 4

Machine

Question 5

Drawing the parts in skeleton form so that only those dimensions which affect their motions are considered.

Answer 5

Kinematic diagram

Question 6

The name given to any body which has motion relative to another.

Answer 6

Link

Question 7

The part of a machine which is stationary and which supports the moving members.

Answer 7

Frame

Question 8

A scale drawing representing the machine so thay only the dimensions which affect its motions are recorded.

Answer 8

Kinematic diagram

Question 9

A _______ is one whose deformations are so small that they can be neglected in determining the motions of various other links in a machine.

Answer 9

Rigid link

Question 10

A belt or a chain is what kind of link?

Answer 10

Flexible link

Question 11

A system of links, that is, rigid bodies, which are either joined together or are in contact with one another in a manner that permits them to move relative to one another.

Answer 11

Kinematic chain

Question 12

If one of the links is fixed and the movement of any other link to a new position will cause each of the other links to move definite predictable positions, the system is a ___________.

Answer 12

Constrained kinematic chain

Question 13

If one of the links is held fixed and the movement of any other link to a new position will not cause each of the other links to move to a definite predictable positions, then what kind of system is this?

Answer 13

Unconstrained kinematic chain

Question 14

A ________ is a constrained kinematic chain.

Answer 14

Mechanism or linkage

Question 15

An assemblage that does not constitute a kinematic chain because there can be no motion of the members relative to one another.

Answer 15

Structure or truss

Question 16

All machines are mechanisms, but not all mechanisms are machines

Answer 16

True

Question 17

By making a different link in a kinematic chain the fixed member.

Answer 17

Inversion

Question 18

Two bodies in contact constitute a ______.

Answer 18

Pair

Question 19

___________ exists when two surfaces are in contact.

Answer 19

Lower pairing

Question 20

_________ refers to a contact which exists at a point or along a line.

Answer 20

Higher pairing

Question 21

A piston and its cylinder wall, a journal and its supporting bearing is an example of what type of pairing?

Answer 21

Lower pairing

Question 22

A ball bearing where point contact exists between the ball and the race is an example of what kind of pairing?

Answer 22

Higher pairing

Question 23

A body has _______ if all its points move in planes which are parallel to some reference plane.

Answer 23

Plane motion

Question 24

What are the 3 types of plane motion?

Answer 24

Translation
Rotation
Combination of Translation and Rotation

Question 25

A body has _______ if it moves so that all straight lines in the body move parallel positions.

Answer 25

Translation

Question 26

A motion wherein all points of the body move in a straight-line paths

Answer 26

Rectilinear translation

Question 27

A translation in which points in the body move along curves paths is called ________.

Answer 27

Curvilinear translation

Question 28

In _______ all points in a body remain fixed distances from a line which is perpendicular to the plane of motion.

Answer 28

Rotation

Question 29

A line that is perpendicular to the plane of motion and has fixed distances in all points in a body during rotation.

Answer 29

Axis of rotation

Question 30

A body has _______ if each point in the body describes a helix.

Answer 30

Helical motion

Question 31

A point has _______ if it moves in three-dimensional space and remains at a fixed distance from some fixed point.

Answer 31

Spherical motion

Question 32

A mechanism completes a ________ when it moves through all its possible configurations and returns to its starting position.

Answer 32

Cycle of motion

Question 33

The time required for one cycle is the ________.

Answer 33

Period

Question 34

The relative positions of the links at any instant during the cycle of motion for the mechanism constitute a ________.

Answer 34

Phase

Question 35

__________ are those which have magnitude only. E.g. distance, area, colume and time

Answer 35

Scalar quantities

Question 36

__________ have magnitude and diracrion. E.g. displacement, velocity, acceleration and force

Answer 36

Vector quantities

Question 37

What can represent a vector quantity?

Answer 37

A straight line with an arrowhead

Question 38

The arrowhead of a vector represents the __________.

Answer 38

Head or terminus

Question 39

The other end of an arrowhead represents the ___________.

Answer 39

Tail or origin

Question 40

The starting point is called the _______.

Answer 40

Pole

Question 41

The sum of vectors is called the _________.

Answer 41

Resultant

Question 42

Refers to the adding tigether of any number of vectors

Answer 42

Composition

Question 43

Refers to the breaking down of a vector into any number of components.

Answer 43

Resolution