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Millwright Block 2 (harmonized) NS > Couplings, Brakes, and Clutches > Flashcards

Couplings, Brakes, and Clutches Flashcards

1
Q

What are the 3 basic types of couplings?

A

Rigid
Flexible
Special purpose

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2
Q

What type of connection do rigid couplings provide?

A

Fixed union
(Shaft extension)

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3
Q

What are the 5 types of rigid couplings?

A

Sleeve
Compression
Ribbed
Flange face
Threaded

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4
Q

What type of applications are sleeve couplings used?

A

Low speed
Low torque

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5
Q

How are sleeve couplings attached to the shafts?

A

Keyway and set screws

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6
Q

How are compression couplings attached to the shaft?

A

Using tapered sleeves and hubs

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7
Q

What applications are compression couplers used in?

A

-Light to moderate loads
-Where the coupling must be installed/removed frequently

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8
Q

What applications are ribbed couplings used?

A

Heavy load
Heavy torque

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9
Q

How are ribbed couplings attached to the shaft?

A

Compression from the bolts
Keyway

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10
Q

What type of coupler is this?

A

Ribbed coupling

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11
Q

What type of coupler is pictured?

A

Sleeve coupling

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12
Q

What type of coupler is pictured?

A

Compression coupler

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13
Q

What is a rigid multi bore coupler?

A

A ribbed coupling for two different sized shafts

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14
Q

How are flange face couplings attached to the shaft?

A

Heavy interference or taper fit

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15
Q

What applications are flange face couplings used in?

A

Light application

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16
Q

What coupler is pictured?

A

Flange face coupler

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17
Q

What are threaded couplers used for?

A

Mainly with pumps or vertical positions

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18
Q

What type of coupler is pictured?

A

Threaded

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19
Q

What is the main benefit of using a flexible coupling?

A

Compensate for some misalignment

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20
Q

What are the 3 ways flexible couplings are classified?

A

Mechanical flexibility
Material flexibility
Combination

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21
Q

What are the 4 types of mechanical flexible couplings

A

Roller chain
Silent chain
Synthetic chain
Gear

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22
Q

What are the 3 types of chain couplings?

A

Roller
Silent
Synthetic

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23
Q

What are the characteristics of chain couplings?

A

-Mechanical flexibility
-Limited torsional, shock, and vibration dampening capabilities

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24
Q

What are the 2 type of roller chain couplings?

A

Double
Single

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25
Q

What coupler is pictured?

A

Single roller chain coupling

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26
Q

What applications are silent chain couplings used for?

A

Heavy duty

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27
Q

What speeds can silent chain get to?

A

Up to 5000rpm

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28
Q

What are the disadvantages to silent chain?

A

Very minimal amounts of misalignment
Flexibility is very limited

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29
Q

What applications are synthetic chains used for?

A

Light power transmission drives

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30
Q

What type of coupler is pictured?

A

Silent chain

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31
Q

What applications are gear couplings used for?

A

Extremely high torque
High rpm’s

32
Q

What is the benefit of curved tooth gear couplings?

A

Tolerate more misalignments

33
Q

What are the 4 most common material flexible couplings?

A

Rubber tire couplings
Elastomeric couplings
Pin and biscuit couplings
Flexible metal disc couplings

34
Q

What is the main disadvantage to material flexible couplings?

A

Shorter service life

35
Q

Which type of coupling must have misalignment less than bearing tolerance?

A

Rigid

36
Q

The input shaft of a fluid coupling is connected to which component?

A

Impeller

37
Q

What is the purpose of a fluid coupling?

A

To allow the driver to come up to speed before engaging

38
Q

Allowing the prime mover to reach a set running rpm before applying load using a clutch is known as ___________

A

A soft start

39
Q

A shaft with universal joints on each end and a splined slip joint is best used when

A

Angular, offset and or axial misalignment is present

40
Q

What is the main advantage of a flexible coupling over a rigid coupling?

A

They compensate for minor misalignment

41
Q

What style of coupling is commonly used on vertical pumps?

A

Threaded coupling

42
Q

What are the 3 styles styles of universal joints?

A

Double joint
Single joint
constant velocity

43
Q

Where are silent chain couplings mainly used?

A

High speed
High torque

44
Q

What must be done in terms of maintenance with a steel grid coupling

A

Must be lubricated

45
Q

What is another name for a scoop coupling?

A

Variable fill

46
Q

What do we call a short length of shafting coupled on each end with no bearing support?

A

Floating shaft

47
Q

What coupling increases initial torque on engagement?

A

Torque converter

48
Q

What is hysteresis

A

Lagging magnetism as the coupling turns

49
Q

What is a disadvantage of positive contact clutches?

A

Engagement must be done at low speeds

50
Q

What is the purpose of a fluid coupling?

A

To allow the driver to come up to speed before engaging

51
Q

What is a backstop device on an inclined converter?

A

A one way brake on the roller drive

52
Q

Brakes or clutches would be classified as electrical operation when what principles are used?

A

Magnetic or magnetic particle principals

53
Q

What would a brake use to stop a piece of rotating machinery

A

Friction or magnetism

54
Q

How many directions can a spiral clutch operate?

A

One

55
Q

What type of clutch has no slippage on engagement and allows bidirectional power transmission?

A

Multi tooth clutch

56
Q

What type of drum clutch has contact on the inside diameter to force engagement?

A

Expanding

57
Q

Cone clutches typically use a drum and pad engagement angle greater than _____ degrees

A

10

58
Q

What force is used when a brake is applied to keep the machine parts at rest?

A

Static friction

59
Q

What friction clutch uses a wedging action for engagement?

A

Cone clutches

60
Q

What type of device is purposely used to engage and disengage two shafts without physically dismantling machinery?

A

Clutches

61
Q

Jaw style clutches assure positive drive with ____________

A

No slippage

62
Q

What is sprag?

A

A cammed roller or wedge

63
Q

When will friction clutches do their most slipping?

A

On engagement

64
Q

What do torque limiting clutches when they become overloaded ?

A

Slip

65
Q

Is a threaded coupling a centrifugal coupling?

A

No

66
Q

What effect reduces brake stopping efficiency?

A

Brake fade

67
Q

Which friction clutch uses expanding or contracting shoes?

A

Radial clutch

68
Q

When can friction clutches be engaged?

A

Anytime regardless of driven and driver speeds

69
Q

What do brakes use to work effectively?

A

Friction

70
Q

What is needed most of braking a heavy load for a prolonged time?

A

Lots of cooling capacity

71
Q

What will increase the torque capacity the most in an axial clutch with limited diameter

A

Increase number of friction plates

72
Q

What coupling used material flexibility to transmit power and deal with minor misalignment

A

Quill coupling

73
Q

Where are silent chain couplings mainly used?

A

High speed
High torque

74
Q

What is an example of a typical back stop device on an inclined conveyor?

A

A one way brake on the roller device

75
Q

When can friction clutches be engaged?

A

Anytime regardless of driven and driver speed

76
Q

What is needed if braking a heavy load or for prolonged periods of time?

A

Lots of cooling capacity

77
Q

What actuates a pneumatically actuated brake or clutch

A

Air pressure

Millwright Block 2 (harmonized) NS (17 decks)

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