firstexam

Question 1

A machine is something that ____ force

Answer 1

modifies

Question 2

____ is when force comes from an outside source

Answer 2

Input

Question 3

The mechanical action of the machine produces _____

Answer 3

output

Question 4

The study of the motions and forces that occur between input and output

Answer 4

Mechanics

Question 5

First Law of Mechanics

Answer 5

Motion does not require force; force only needed to accelerate motion

Question 6

Second Law of Mechanics

Answer 6

The greater the force, the greater the acceleration

Question 7

Third Law of Mechanics

Answer 7

Action and Reaction; of object pushed, it will push equally in opposite direction

Question 8

5 basic mechanical systems

Answer 8

Inclined plane, wedge, screw, lever, wheel

Question 9

Lever of first order

Answer 9

Fulcrum is always between load and effort

Question 10

Lever of second order

Answer 10

Load lies between fulcrum and effort

Question 11

Lever of third order

Answer 11

Effort applied between fulcrum and load

Question 12

Shaft and bearing

Answer 12

Shafts can be anything, they must fit bearings which keeps the rotating shaft stable and running smoothly

Question 13

Snail Cam

Answer 13

Pushes shaft upwards; shaft also needs support of a bearing;

Question 14

Crank

Answer 14

A lever attached to a rotating shaft - converts rotation to reciprocation; crank is circular disk with pin, rod constrained by guides, when shaft rotates, rod reciprocates

Question 15

Cams turn_____ motion into an upward and downward motion

Answer 15

rotary

Question 16

Lobe cams

Answer 16

Produce multiple events per cycle

Question 17

All machines almost always employ at least _____

Answer 17

one lever

Question 18

Mechanical ______ is ratio of load versus effort

Answer 18

advantage

Question 19

Leverage is the ratio distances of the ____and load to the fulcrum

Answer 19

effort

Question 20

A lever of the second order is also known as a force _____

Answer 20

multiplier

Question 21

A lever of the third order is also known as a force _____

Answer 21

reducer

Question 22

A ______converts rotation to reciprocation

Answer 22

lever attached to a rotation shaft-cranks

Question 23

____is the difference between a cam’s minimum and maximum radii

Answer 23

Throw

Question 24

Eccentricity

Answer 24

Means to be off-center; like a cam

Question 25

Unlike cranks, cams have the ability to store _______

Answer 25

information

Question 26

Cams are the ______version of computer programs

Answer 26

mechanical

Question 27

A ____ crank converts up-down motion to side-to-side motion

Answer 27

bell

Question 28

A 3-bar linkage is for _____motion

Answer 28

straight-line

Question 29

A slider-crank with a _____increases lever sway

Answer 29

lower bearing

Question 30

Levers move in a ______arc

Answer 30

circular

Question 31

A _____can be used to keep the lever against the cam so it follows the profile

Answer 31

spring

Question 32

Springs in cam-followers increase _____, so tensioners are used

Answer 32

friction

Question 33

4 types of springs

Answer 33

compression, extension, torsion, and radial springs

Question 34

Ratchets give ____motion

Answer 34

stepped

Question 35

For ratchets, the ______ stops the wheel from slipping back

Answer 35

second pawl (detent)

Question 36

Drives and gearing provide _____ connections

Answer 36

rotary-to-rotary

Question 37

In friction drives, _____is often employed to prevent belt slip

Answer 37

flanges

Question 38

A _____ is a tensioning mechanism which is used to take up slack in a belt

Answer 38

tensioner

Question 39

In timing belts, the belt has ____ to engage the notches in the pulley wheels

Answer 39

teeth

Question 40

In chain and sprocket drives, ____ can be added or removed

Answer 40

links

Question 41

Spur gears have the same number of ____

Answer 41

teeth

Question 42

In a _____drive, the geared wheel meshes with a toothed rack

Answer 42

rack and pinion

Question 43

In a _____drive, the geared wheel meshes with a toothed rack

Answer 43

worm gear

Question 44

In bevel gears, the 2 wheels mesh at ____degrees

Answer 44

45

Question 45

The _____is simpler form of the bevel gear and is easier to fabricate

Answer 45

pin wheel

Question 46

In bevel gears, the _____changes from horizontal to vertical

Answer 46

plane of rotation

Question 47

Two types of positive drives

Answer 47

Toothed Belts and Chain&Sprocket

Question 48

Two types of drives

Answer 48

Friction and positive; positive have input and output locked and synchronous while friction use friction to transfer movement

Question 49

Bevel gear changes the plane of rotation from ______ to _____

Answer 49

horizontal to vertical