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Science > Mechanical Engineering > Flashcards

Mechanical Engineering Flashcards

1
Q

What are Links?

A

Two parts that come together.

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2
Q

What is a Complete Link?

A

When both parts move together.

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3
Q

What is a partial link?

A

Parts that move separately.

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4
Q

Is the relationship between a tire and a wheel complete or partial?

A

Complete.

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5
Q

Is the relationship between the two handles of a can opener partial or complete?

A

Partial

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6
Q

What is a direct link?

A

2 parts together without a linking component.

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7
Q

What is a indirect link?

A

2 parts together with a linking component.

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8
Q

In a pair of scissors, is the relationship between the two handles direct or indirect?

A

Indirect (due to the rivet)

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9
Q

Is the link between a blade and shoe on a skate direct or indirect?

A

Indirect (due to the screw)

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10
Q

What is a removable link?

A

Parts that can be removed without breaking the parts or linking component.

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11
Q

What is a non-removable link?

A

Parts that can’t be removed without breaking parts or linking component.

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12
Q

What is a flexible link?

A

One of the parts must come back to it’s original position when deformed (usually needs a spring).

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13
Q

What is a rigid link?

A

A part that can only go back to it’s original position through human force.

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14
Q

In a bookshelf, is the relationship between the shelf and side panel rigid or flexible?

A

Rigid.

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15
Q

In a clothespin, is the relationship between the two prongs rigid or flexible?

A

Flexible.

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16
Q

When looking at an object, and we must identify whether the characteristic of a link is direct or indirect.

What question should we ask ourselves?

A

Do the parts require something else to hold them together?

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17
Q

When looking at an object, and we must identify whether the characteristic of a link is rigid or flexible.

What question should we ask ourselves?

A

Can the linking component be deformed when used and will it return to it’s original position?

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18
Q

When looking at an object, and we must identify whether the characteristic of a link is Removable or Non-Removable.

What question should we ask ourselves?

A

Can the object be taken apart without causing damage to the object?

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19
Q

When looking at an object, and we must identify whether the characteristic of a link is Partial or Complete.

What question should we ask ourselves?

A

Is movement possible between the two parts?

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20
Q

What are the characteristics of using a screw as a linking component?

A

It’s removable, indirect and rigid.

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21
Q

What are the characteristics of using a rivet as a linking component?

A

It’s indirect, rigid and non-removable.

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22
Q

What are the two main differences between a screw and a rivet.

A

A screw is removable and exerts a helical guide.

A rivet is non removable and exerts a rotational guide.

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23
Q

What are the three guiding controls?

A

Translational
Rotational
Helical

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24
Q

What component in a system typically acts as the guide for translational motion.

A

A track.

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25
Q

What is an axle?

A

A rod or shaft that connects a pair of wheels to propel them and retain the position of the wheels to one another.

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26
Q

What is Motion Transmission?

A

Motion that moves from one place to another.

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27
Q

What is Motion Transformation?

A

When there is a change in the type the motion.

28
Q

Is Gear Train a motion Transmission or motion Transformation system?

A

Motion Transmission.

29
Q

Is Belt and Pulley motion Transmission or motion Transformation system?

A

Motion Transmission.

30
Q

Is Chain and Sprocket motion Transmission or motion Transformation system?

A

Motion Transmission.

31
Q

Is Friction Gears motion Transmission or motion Transformation system?

A

Motion Transmission.

32
Q

Is Worm and Worm Gear motion Transmission or motion Transformation system?

A

Motion Transmission.

33
Q

Is Rack and Pinion motion Motion Transformation or Motion Transmission system?

A

Motion Transformation.

34
Q

Is Cam and Follower Motion Transformation or Motion Transmission system?

A

Motion Transformation.

35
Q

Is Crank and Connecting Rod Motion Transformation or Motion Transmission system?

A

Motion Transformation.

36
Q

Is Screw Gear System Motion Transformation or Motion Transmission system?

A

Motion Transformation.

37
Q

Is Rotating Slider Crank Motion Transformation or Motion Transmission system?

A

Motion Transformation.

38
Q

What will the speed change be from small gear to big?

A

A decrease in speed.

39
Q

What will the speed change be from big to small?

A

Increase in Speed.

40
Q

What are the two speed ratios?

A

Speed Ration #1: #of teeth Driver/#of teeth of Driven.

Speed Ratio #2: Diameter of Driver/Diameter of Driven.

41
Q

What is reversible gear system?

A

The Driver become the Driven.

42
Q

Are Friction Gears Reversible?

A

Yes.

43
Q

Is Belt and Pulley Reversible?

A

Yes.

44
Q

Is Gear Train Reversible?

A

Yes.

45
Q

Is Chain and Sprocket Reversible?

A

Yes.

46
Q

Is Worm and Worm Gear Reversible?

A

No.

47
Q

Is Screw Gear System Reversible?

A

No.

48
Q

Is Cam and Follower Reversible?

A

No.

49
Q

Is Connecting Rod and Crank Reversible?

A

Yes.

50
Q

Is Rack and Pinion Reversible?

A

Yes.

51
Q

What are the Advantages and Disadvantages of Friction Gears?

A

Advantages: Easy to assemble, cheap and allows slippage.

Disadvantages: Wheels must always be together, wheels can slip.

52
Q

What are the Advantages and Disadvantages of Belt and Pulley?

A

Advantages: Easy to assemble, allows slippage, allows for transmission of motion over long distances.

Disadvantages: Slippage will occur as the belt’s condition gets worse over time and must be kept clean.

53
Q

What are the advantages and disadvantages of a Gear Train?

A

Advantages: Will not allow slippage, Allows for large forces to be transmitted.

Disadvantages: Needs lubrication, Subject to severe damage if one of the parts malfunctions.

54
Q

What are the advantages and disadvantages of Chain and Sprocket system?

A

Advantages: Will not allow slippage and Allows for large forces to be transmitted.

Disadvantages: Needs Lubrication.

55
Q

What are the advantages and disadvantages of Wheel and Worm Gear?

A

Advantages: Will not allow slippage and Allows for fine adjustment.

Disadvantages: Needs lubrication.

56
Q

What are the advantages and disadvantages of a screw gear system?

A

Advantages: Allows for precise adjustment in its use.

Disadvantages: Parts need to be lubricated.

57
Q

What are the advantages and disadvantages of Cam and Follower?

A

Advantages: Allows for very precise and custom translational motion.

Disadvantages: Parts need to be lubricated A return mechanism (ex: spring has to be built into design).

58
Q

What are the advantages and disadvantages of Connecting Rod and Crank?

A

Advantages: Allows force to be applied without slippage and change motion from translational to rotational or vice versa.

Disadvantages: Parts need to be lubricated

59
Q

What are the advantages and disadvantages of Rotating Slider Crank Mechanism?

A

Advantages: Change motion from translational to rotational or vice versa

Disadvantages: Parts need to be lubricated and Reversibility is only partial.

60
Q

What are the advantages and disadvantages of Rack and Pinion?

A

Advantages: Allows force to be applied without slippage.

Disadvantages: Parts need to be lubricated and Very precise fit needed between teeth of rack and pinion.

61
Q

What are Degrees of Freedom?

A

The ways parts move independently.

62
Q

How many degrees of freedom are there?

A

6.

63
Q

What is Adhesion?

A

Two surfaces that remain in contact with each other without slipping.

64
Q

What is Friction?

A

A force that resists motion when the surface of one object comes in contact with the surface of another.

65
Q

What is the Advantage of adhesion and friction.

A

Controlling Motion.

66
Q

What is the Disadvantage of adhesion and friction?

A

Wearing down of parts of an object and production of unwanted heat.

67
Q

What are the 5 factors Adhesion depends on?

A

The Nature of the Surface

Weight of the object
(Perpendicular Force)

Temperature

Condition of the surface

Presence of a Lubricant

Science (7 decks)

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