Mechanics Final #2

Question 1

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

Answer 1

Clutches

Question 2

What are brakes used for?

Answer 2

Stop, hold or slow a load

Question 3

Name 3 methods to create torque transmission:

Answer 3

1) Friction
2) Electromagnetic
3) Mechanical lockup

Question 4

Name 4 categories of actuation methods for brakes and clutches:

Answer 4

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

Question 5

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

Answer 5

Friction

Question 6

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

Answer 6

Centrifugal

Question 7

Name 3 common troughing roll angles:

Answer 7

1) 20
2) 35
3) 45

Question 8

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

Answer 8

45°

Question 9

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

Answer 9

Impact zone

Question 10

What pulley drives the conveyer?

Answer 10

Head pulley

Question 11

Name 2 ways to add tension to a conveyer:

Answer 11

1) Counterweight
2) Take-up

Question 12

Name 2 ways to join conveyers:

Answer 12

1) Vulcanized
2) Mechanical splicing

Question 13

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

Answer 13

Pan conveyer

Question 14

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

Answer 14

Trough belt conveyer

Question 15

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

Answer 15

Screw conveyer

Question 16

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

Answer 16

True

Question 17

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

Answer 17

False

Question 18

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

Answer 18

True

Question 19

Name 3 types of conveyers:

Answer 19

1) Trough
2) Pan
3) Screw

Question 20

Name 2 tail pulleys:

Answer 20

1) Winged
2) Drum

Question 21

What is the most commonly used degree on conveyors?

Answer 21

35°

Question 22

Name 3 types of rigid couplings:

Answer 22

1) Flange
2) Sleeve
3) Ribbed

Question 23

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

Answer 23

Flanged

Question 24

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

Answer 24

Ribbed

Question 25

Name 4 functions of flexible couplings:

Answer 25

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

Question 26

Name 2 types of shaft Misalignment:

Answer 26

1) Angular 2) Parallel

Question 27

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

Answer 27

Backlash

Question 28

"Axial movement" is also known as?

Answer 28

1) End play 2) End float

Question 29

Name 3 types of chain coupling:

Answer 29

1) Double roller 2) Silent 3) Plastic

Question 30

Name 3 couplings that require lubrication:

Answer 30

1) Double roller 2) Silent 3) Grid

Question 31

Name 3 couplings that do not require lubrication:

Answer 31

1) Sleeve 2) Flange 3) Ribbed

Question 32

Name 2 types of U-joints:

Answer 32

1) Pin & Block 2) Cross & Bearing

Question 33

What is the only way universal joints can accommodate misalignment?

Answer 33

Use a telescoping shaft

Question 34

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

Answer 34

Square jaw coupling

Question 35

What is the elastomeric insert called inside square jaw couplings?

Answer 35

Spider

Question 36

What changes AC to DC?

Answer 36

Rectifier

Question 37

What changes DC to AC?

Answer 37

Inverter

Question 38

What changes AC to lower voltage AC?

Answer 38

Transformer

Question 39

Which type of gear is used in planetary gear systems?

Answer 39

Internal

Question 40

Name 3 types of field wound motors:

Answer 40

1) Series 2) Shunt 3) Compound

Question 41

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

Answer 41

True

Question 42

Name 2 basic types of DC motors:

Answer 42

1) Brushed 2) Brushless

Question 43

Name 2 types of DC brush type motors:

Answer 43

1) Permanent magnet 2) Field wound

Question 44

Which type of DC motor uses magnets as the stator?

Answer 44

Permanent magnet

Question 45

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

Answer 45

Commutator

Question 46

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

Answer 46

Field wound

Question 47

What is the rotating portion of a DC motor called?

Answer 47

Armature

Question 48

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

Answer 48

Brushless

Question 49

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

Answer 49

C-face motor

Question 50

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

Answer 50

D-flange motor

Question 51

An AC motor consists of what 2 main parts:

Answer 51

1) Rotor 2) Stator

Question 52

2 or more sets of stator windings are called what?

Answer 52

Poles

Question 53

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

Answer 53

Slip

Question 54

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

Answer 54

3 phase AC induction motor

Question 55

Name 3 unidirectional clutches:

Answer 55

1) Ramp 2) Roller 3) Spiral

Question 56

Name 3 bidirectional clutches:

Answer 56

1) Magnetic particle 2) Electromagnetic 3) Multiple tooth

Question 57

Name 3 disadvantages to rigid couplings:

Answer 57

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

Question 58

Name 5 types of gears:

Answer 58

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