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Mechanics > Mechanics Final #2 > Flashcards

Mechanics Final #2 Flashcards

1
Q

Used to connect the prime mover to a load in a manner that allows torque transmission to be interrupted?

A

Clutches

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2
Q

What are brakes used for?

A

Stop, hold or slow a load

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3
Q

Name 3 methods to create torque transmission:

A

1) Friction
2) Electromagnetic
3) Mechanical lockup

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4
Q

Name 4 categories of actuation methods for brakes and clutches:

A

1) Mechanical
2) Electromagnetic
3) Pneumatic
4) Hydraulic

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5
Q

Which type of clutch and brakes is the most common for starting and stopping?

A

Friction

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6
Q

The higher the speed, the higher the torque is which type of clutch?

A

Centrifugal

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7
Q

Name 3 common troughing roll angles:

A

1) 20
2) 35
3) 45

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8
Q

Troughing rolls in the impact zone are mounted at what angle?

A

45°

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9
Q

The area material comes off a shoot onto a conveyor is called what?

A

Impact zone

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10
Q

What pulley drives the conveyer?

A

Head pulley

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11
Q

Name 2 ways to add tension to a conveyer:

A

1) Counterweight
2) Take-up

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12
Q

Name 2 ways to join conveyers:

A

1) Vulcanized
2) Mechanical splicing

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13
Q

Which conveyer type handles large abrasive material that would damage rubber belts?

A

Pan conveyer

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14
Q

Which conveyor type is used to move bulk materials such as rock, coal, etc.?

A

Trough belt conveyer

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15
Q

Which conveyor type is available up to 24” and rotates in a trough to move material forward?

A

Screw conveyer

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16
Q

T or F:
Spur gears are the most commonly used gear type?

A

True

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17
Q

T or F:
Spur gears are quieter than Helical gears?

A

False

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18
Q

T or F:
Worm gears are all right angle drives?

A

True

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19
Q

Name 3 types of conveyers:

A

1) Trough
2) Pan
3) Screw

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20
Q

Name 2 tail pulleys:

A

1) Winged
2) Drum

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21
Q

What is the most commonly used degree on conveyors?

A

35°

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22
Q

Name 3 types of rigid couplings:

A

1) Flange
2) Sleeve
3) Ribbed

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23
Q

Of the 3 rigid couplings, which is the most commonly used?

A

Flanged

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24
Q

Which of the rigid couplings is for heavy duty use and considered to be maintenance free?

A

Ribbed

25
Q

Name 4 functions of flexible couplings:

A

1) Dampen
2) Measure
3) Insulate
4) Protect

26
Q

Name 2 types of shaft Misalignment:

A

1) Angular
2) Parallel

27
Q

How do gear couplings accommodate Misalignment with Axial clearance between the gear teeth?

A

Backlash

28
Q

“Axial movement” is also known as?

A

1) End play
2) End float

29
Q

Name 3 types of chain coupling:

A

1) Double roller
2) Silent
3) Plastic

30
Q

Name 3 couplings that require lubrication:

A

1) Double roller
2) Silent
3) Grid

31
Q

Name 3 couplings that do not require lubrication:

A

1) Sleeve
2) Flange
3) Ribbed

32
Q

Name 2 types of U-joints:

A

1) Pin & Block
2) Cross & Bearing

33
Q

What is the only way universal joints can accommodate misalignment?

A

Use a telescoping shaft

34
Q

What has two hubs with projecting jaws that mate with a one piece elastomeric “spider” insert?

A

Square jaw coupling

35
Q

What is the elastomeric insert called inside square jaw couplings?

A

Spider

36
Q

What changes AC to DC?

A

Rectifier

37
Q

What changes DC to AC?

A

Inverter

38
Q

What changes AC to lower voltage AC?

A

Transformer

39
Q

Which type of gear is used in planetary gear systems?

A

Internal

40
Q

Name 3 types of field wound motors:

A

1) Series
2) Shunt
3) Compound

41
Q

T or F:
Direct current does not change direction and always moves in the same direction?

A

True

42
Q

Name 2 basic types of DC motors:

A

1) Brushed
2) Brushless

43
Q

Name 2 types of DC brush type motors:

A

1) Permanent magnet
2) Field wound

44
Q

Which type of DC motor uses magnets as the stator?

A

Permanent magnet

45
Q

In a permanent magnet motor the windings are attached to the _____?

A

Commutator

46
Q

Which category of DC motors had the field windings on the stator?

A

Field wound

47
Q

What is the rotating portion of a DC motor called?

A

Armature

48
Q

Which type of DC motor has the magnets on the rotor and windings in the stator?

A

Brushless

49
Q

Which type of AC motor has threaded holes to allow for attachment and an end bell?

A

C-face motor

50
Q

Which AC motor has flange which allows the motor to be bolted directly on the driven machinery?

A

D-flange motor

51
Q

An AC motor consists of what 2 main parts:

A

1) Rotor
2) Stator

52
Q

2 or more sets of stator windings are called what?

A

Poles

53
Q

The difference between synchronous speed and the actual rotor speed is called what?

A

Slip

54
Q

Because of its low cost and high efficiency, which motor is considered the “workhorse of the industry”?

A

3 phase AC induction motor

55
Q

Name 3 unidirectional clutches:

A

1) Ramp
2) Roller
3) Spiral

56
Q

Name 3 bidirectional clutches:

A

1) Magnetic particle
2) Electromagnetic
3) Multiple tooth

57
Q

Name 3 disadvantages to rigid couplings:

A

1) No machine protection
2) Require perfect alignment
3) Needs bearing support

58
Q

Name 5 types of gears:

A

1) Spur
2) Helical
3) Worm
4) Bevel
5) Hypoid

Mechanics (17 decks)

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