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Moco > First Semester > Flashcards

First Semester Flashcards

1
Q

Work

A

/ft

Work * distance

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2
Q

2nd rule of machines

A

Machine enable us to amplify speed at the expense of force

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3
Q

5 simple/ancient machines

A 
Lever
Pulley
Wheel & axel
Inclined plane/wedge
Screw
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4
Q

Chains

A

Won’t slip compared to vbelts

Load is based on lubrication (we use type 1 lube)

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5
Q

|

A

110 v

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6
Q

Newton’s 3rd Law

A

Every action has equal opposite reaction

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7
Q

Friction

A

Resistance that keeps 2 objects from slipping and moving past each other

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8
Q

Wedge IMA

A

Length(diag)/height

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9
Q

3rd rule of machines

A

Can’t do both rules at same time

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10
Q

Inertia

A

Tendency of an object to continue moving or not

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11
Q

Unit for torque

A

Ft/#’s

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12
Q

Torque

A

Twisting motion about an axis

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13
Q

2nd Class Lever

A

Load located between fulcrum and force

Ratio of 1:2

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14
Q

Work

A

Force * distance

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15
Q

Prime mover

A

Source of input power to the system

-might be motor, engine, gravity, freshman

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16
Q

Parallel

A

Parallel lines

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17
Q

Screw effort force

A

Resist force/(IMA*efficiency)

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18
Q

Machine rules

A

Machine must have more power than load

Drive system/transmission must have greater power capacity than the motor

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19
Q

1st class lever

A

Fulcrum in between load and force

Ratio of 1

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20
Q

Efficiency

A

AMA/IMA

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21
Q

EMF

A

Electromotive force

Photoelectric
Thermoelectric
Mechanical magnetic
Piezoelectric friction

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22
Q

Acceleration

A

Rate @ which we change speed/sec

23
Q

Minimum belt contact

A

150 degrees so you have friction

24
Q

Cheapest gears to maintenance

A

Spur gears

-noisy

25
Q

1 HP = ____ #/1 Ft/ 1 Sec

A

550#

26
Q

West VirginiA

A

Watts = volts • amps

27
Q

Hots in 220 load if coming from 220 source

A

2

28
Q

Pulley IMA

A

of lines supporting load, 4:1, 3:1, etc

29
Q

Hots in 110

A

1 hot

1 neutral

30
Q

Wedge AMA

A

IMA * efficiency (given)

31
Q

Moment arm * force

A

Torque

32
Q

Helical gears

A

Converts more torque at a time

  • more expensive
  • introduces lateral force
33
Q

Belt advantages

A

Inexpensive in relation to gearboxes

Require little maintenance, no grease or oil

Can tolerate high misalignment

Slipping can be advantageous

34
Q

Wheel Axle IMA

A

Rw/Ra

Radius of wheel/radius of axle

35
Q

IMA

A

Displacement Effort/ Displacement resistance = IMA

36
Q

3rd Class Lever

A

Force located between fulcrum and load

37
Q

Differential chain hoist IMA

A

2R/R-r

R = big radius

r = small radius

38
Q

4 parts of useful electrical circuit

A

Source of EMF
conductor
Load
Control

39
Q

How many watts in 1 HP

A

746 Watts

40
Q

Series

A

Erasing line after first stop to first on

41
Q

Bevel gears

A

90 degree similar to spur gears

Inexpensive

42
Q

Newton’s 1st Law

A

Object at rest will stay at rest, object in motion will stay in motion unless acted on by outside force

43
Q

1st rule of machines

A

Enable us to amplify force at expense of distance/speed

44
Q

Angle of repose

A

Angle before impending motion

45
Q

7 reasons why we automate

A
  1. Weight
  2. Repeat
  3. Money
  4. Speed
  5. Complexity
  6. Accuracy
  7. Education
46
Q

F=MA

A

Amount of force to overcome the inertia of an object

47
Q

Screw IMA

A

Circumference of handle/Pitch

=23.14r/Pitch

48
Q

Newton’s 2nd Law

A

When force applied to object, object will move in direction of force

49
Q

Point of impending motion

A

When force of the effort overcomes static friction

50
Q

RPM formula

A

(Distance/time)*12

/drum circumference

*60

51
Q

AMA

A

Fr/Fe=AMA

52
Q

Herring bone fear

A

No lateral force cause 2 of them
Can do twice the work

-more expensive

53
Q

Pulley AMA

A

load/force

Moco (4 decks)

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