INTRODUCTION

Question 1

is design on the basis of
motion requirements in contrast to design on the basis of strength
requirements.

Answer 1

Kinematic design

Question 2

rotates at a constant angular velocity,

Answer 2

The cam

Question 3

moves
up and down.

Answer 3

follower

Question 4

On the upward motion

Answer 4

the follower is driven by the cam,

Question 5

on the return motion

Answer 5

it is driven by the action
of gravity or of a spring.

Question 6

where
two cams are used per cylinder to operate the intake and exhaust valves,

Answer 6

automotive engine

Question 7

are used in many applications to transmit motion from one shaft to another with a constant angular velocity ratio.

Answer 7

Gears

Question 8

consists of two or more gears in series. Its application is to increase or decrease the speed or torque of the output shaft.

Answer 8

A Gear train

Question 9

What is a good example of a gear train?

Answer 9

automobile transmission where
three speeds forward and one in reverse arc obtained by shifting two gears.

Question 10

is a combination of rigid or resistant bodies so formed and connected that they move upon each

other with definite relative motion .

Answer 10

mechanism

Question 11

What is an example of mechanism?

Answer 11

crank, connecting rod, and piston of an internal-
combustion engine

Question 12

is a mechanism or collection of mechanisms which transmit force from the source of power to the
resistance to be overcome.

Answer 12

machine

Question 13

What is an exampe of a machine?

Answer 13

internal-combustion engine.

Question 14

When a rigid body so moves that the position of each straight
line of the body is parallel to all of its other positions,

Answer 14

translation.

Question 15

All points of the body move in
parallel straight line paths.

Answer 15

Rectilinear translation.

Question 15

The paths of the points arc identical
curves parallel to a fixed plane.

Answer 15

Curvilinear translation.

Question 16

If each point of a rigid body having plane motion remains at a constant distance from a fixed axis that is perpendicular to
the plane of motion,

Answer 16

body has motion of rotation.

Question 17

If the body rotates back and forth through a given angle, it is said to

Answer 17

oscillate.

Question 18

When a rigid body moves so that each point of the body bas motion of
rotation about a fixed axis and at the same time has translation parallel to
the axis,

Answer 18

helical motion.

Question 19

When a rigid body moves so that each point of the body has
motion about a fixed point while remaining at a constant
distance from it,

Answer 19

Spherical motion

Question 20

A body moving with rotation about three nonparallel axes and
translation in three independent directions

Answer 20

spatial motion.

Question 21

When the parts of a mechanism have passed through all the possible positions they can assume after starting from
some simultaneous set of relative positions and have returned to their original relative Positions,

Answer 21

cycle

Question 22

The time required for a cycle of motion

Answer 22

period.

Question 23

The simultaneous relative positions of a mechanism at a given instant during a cycle

Answer 23

phase.

Question 24

The geometrical forms by which two members of a mechanism are joined together so that the relative motion between these two members is consistent

Answer 24

pairing elements.

Question 25

If the joint by which two members are connected has surface contact such as a pin joint,

Answer 25

lower pair.

Question 26

If the connection takes place at a point or along a line such as in a ball bearing or between two gear teeth in contact,

Answer 26

higher pair.

Question 27

A _______ can be either a lower or a higher pair depending upon whether a pin and bushing or a ball bearing is used for the connection.

Answer 27

turning pair

Question 28

A ______ will be a lower pair as between a piston and cylinder wall.

Answer 28

sliding pair

Question 29

A _____ is a rigid body having two or more pairing elements by means of which it may be connected to other bodies for purposes of transmitting force or motion.

Answer 29

link

Question 30

When a number of links is connected by means of pairs, the resulting system

Answer 30

kinematic chain.

Question 31

If these links are connected in such a way that no motion is possible,

Answer 31

locked chain (structure)

Question 32

A _____ is obtained when the links are so connected that, no matter how many motion cycles are passed through, the relative motion will always be the same between the links.

Answer 32

constrained chain

Question 33

It is also possible to connect links so that an _____ results, which means that the motion pattern will vary from time to time depending on the amount of friction present in the joints.

Answer 33

unconstrained chain

Question 34

If one of the links of a constrained chain is made a fixed link,

Answer 34

mechanism.

Question 35

If in a mechanism, the link which was originally fixed is allowed to move and another link becomes fixed, the mechanism is said to be _____.

Answer 35

inverted

Question 36

In the study of mechanisms, it is necessary to investigate the method in which motion may be transmitted from one member to another. Motion may be transmitted in three ways:

Answer 36

(a) direct contact between two members such as between a cam and follower or between two gears, (b) through an intermediate link or connecting rod, and (c) by a flexible connector such as a belt or chain.

Question 37

the _____ of a mechanism is the number or degrees of freedom it possesses.

Answer 37

mobility

Question 38

______ is the minimum number of independent parameters required to specify the location of every link within a mechanism.

Answer 38

mobility

Question 39

what is Grubler’s equation?

Answer 39

M = 3(n-1) - 2f1 - f2

Question 40

four types of joints are commonly found in planar mechanisms.

Answer 40

revolute, the prismatic, and the rolling contact joints, and the cam or gear joint

Question 41

What joint has one degree of freedom?

Answer 41

revolute, the prismatic, and the rolling contact joints

Question 42

What joitn has a 2 degree of freedom?

Answer 42

the cam or gear joint

Question 43

M is greater than one

Answer 43

the device is a mechanism with M degrees of freedom

Question 44

M is equal to 0.

Answer 44

the device is a statically determinate structure

Question 45

M is less than -1

Answer 45

the device is a statically indeterminate structure