Brainscape's Knowledge GenomeTM

Browse over 1 million classes created by top students, professors, publishers, and experts.


See full index

MK2 > Main Propulsion > Flashcards

Main Propulsion Flashcards

1
Q

Two main categories of bearing

A

Plain bearings

Anti-friction bearings

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
2
Q

Have a solid surface on which a moving part slides or rolls

A

Plain bearing

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
3
Q

Depends on races containing balls or rollers to make contact with the revolving or sliding surface that it is supporting

A

Anti-friction bearing

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
4
Q

The two categories of bearings are broken down into three main types

A

Journal bearings
Thrust bearings
Frictionless bearings

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
5
Q

Also called split precision bearings

A

Journal bearings

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
6
Q

Support a rotating shaft, support a radial load

A

Journal bearings

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
7
Q

Prevent endwise (axial) motion of a shaft

A

Thrust bearings

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
8
Q

Used for guiding or supporting rotating components

A

Frictionless bearings

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
9
Q

Two concerns that affect choice of bearing type

A

Load type and motion type

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
10
Q

Bearings can be classified by ___

A

Type of movement allowed
Type of load that it will carry
Type of surface that the bearing will come into contact with

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
11
Q

When movement within an engine must be controlled to keep engine components in proper alignment by bearings, the motion is divided into two types ___

A

Axial

Rotary

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
12
Q

Movement along the axis of the shaft that can be in either one direction or back and forth

A

Axial

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
13
Q

Circular movement around the axis of the shaft

A

Rotary

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
14
Q

Load is divided into three types

A

Radial
Thrust
Radial thrust

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
15
Q

Has a load that is at right angles to the axis of the shaft

A

Radial

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
16
Q

Has a load that is along the axis of the shaft

A

Thrust

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
17
Q

Has a load that is a combination of both radial and thrust loads

A

Radial thrust

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
18
Q

Two types of surface contact that classify bearings

A 
Sliding contact (plain bearings)
Rolling contact (anti-friction bearings)
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
19
Q

These bearings are made of softer material than that of the shaft or slide that the bearing will support

A

Plain bearings

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
20
Q

Also called roller contact bearings

A

Anti-friction bearings

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
21
Q

Have a small contact area between the races and the ball or roller of the bearing supports the load on the bearing

A

Anti-friction bearings

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
22
Q

The balls and rollers of anti-friction bearings are made of ___

A

Hardened alloy steels

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
23
Q

Ball bearings, roller bearings, and needle bearings are all ___

A

Anti-friction bearings

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
24
Q

Ball bearing support a load on a series of hardened steel balls and consist of four parts ____

A

Inner ring or race
Outer ring or race
Steel balls
Ball retainer or cage

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
25
Q

The inner ring or race of a ball bearing is ___ on its outer surface

A

Grooved

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
26
Q

The outer ring or race of a ball bearing is ___ on its inner surface

A

Grooved

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
27
Q

Used for spacing the balls in a ball bearing so that they do not touch each other, thus reducing friction, wear, and noise

A

Ball retainer or cage

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
28
Q

Roller bearings come in three distinct shapes __

A

Cylindrical
Tapered
Barrel

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
29
Q

This roller bearing supports radial load only. Intended to handle the heavy radial loads and to operate at higher speeds

A

Cylindrical

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
30
Q

This roller bearing supports radial load, with an axial load in one direction only

A

Tapered

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
31
Q

This roller bearing supports radial loads. Will handle some axial loads and misalignment

A

Barrel

32
Q

Roller bearings using a relatively long and small diameter rollers

A

Needle bearings

33
Q

Normally needle bearing rollers are about ___ in diameter

A

5/64 to 5/32 inch

34
Q

Most common use of needle roller bearings

A

Wrist pin bearings in some diesel engines or in high speed applications

35
Q

___ are 90 degree angular-contact bearings

A

Thrust bearings

36
Q

Support thrust loads at moderate speeds, but for practical purposes, their radial load capacity is nil

A

Thrust bearings

37
Q

Because thrust bearings cannot support radial loads, ball thrust bearings must be used with ___

A

Radial bearings

38
Q

This bearing is of the simplest form, and it consists of several pivoted segments or shoes against which the thrust collar revolves

A

Kingsbury type thrust bearing

39
Q

Ahead or astern axial motion of the shaft to which the thrust collar is secured, is thereby restrained by the action of the ___

A

Thrust shoes against the thrust collar

40
Q

The shoes and collar of the Kingsbury thrust bearing that are encased within the housing are immersed in ___

A

Oil

41
Q

The higher the speed of the shaft, the greater the ___ of the Kingsbury thrust bearing

A

Load capacity

42
Q

These bearings are made for vertical and horizontal applications to accommodate either single or double thrust loads

A

Kingsbury thrust bearing

43
Q

Thrust bearings work when one flat surface is moved along a second flat surface that is ___

A

Free to pivot

44
Q

In a thrust bearing, the second flat surface pivots and assumes an _____ with respect to ___

A

Inclined position

The first surface

45
Q

What separates the two surfaces in a thrust bearing?

A

A thin, wedge-shaped film of oil

46
Q

In a thrust bearing, the thrust is transmitted from the shoes to the ___, which is attached to the ___

A

Base ring

Structure of the ship

47
Q

Never try to repair damaged rolling-element bearings by ___

A

Replacing balls or rollers

48
Q

Never use a piece of machinery if the bearings are known to be in ___

A

Poor condition

49
Q

Watch the performance of newly installed bearings carefully when first starting a piece of machinery until it is known that they have reached their ___

A

Safe-running operation temperature

50
Q

If possible, give newly installed bearings a ___

A

Run in period applying no load

51
Q

Do not remove a rolling element type bearing from its original container and wrapping until every ____

A

Preparation has been made to install it

52
Q

Excessive lubricant in a roller bearing will ___

A

Fill the spaces between the elements, impeding free movement and causing early failure

53
Q

Safe storage for bearings for any length of time requires that the storage area be ____

A

Dry, heated, and below 120 degrees F

54
Q

Although bearings are designed to be extremely rugged, they are sensitive to ___

A

Corrosion, contamination, and abusive handling

55
Q

Why should bearings not be stored in unheated spaces?

A

Because condensation may form on cold surfaces

56
Q

Why should bearings not be stored in temperatures above 120*F?

A

Because the preservative on them will oxidize more rapidly

57
Q

When using bearings, always apply the ___ rule of storage

A

First in, first out

58
Q

The greatest threats to mounted bearings are ___ which is caused by ___

A

Brinelling of the races

Poor handling

59
Q

False brinelling of the races is caused by the ___

A

Wearing away of material due to vibratory motion during storage or transport and corrosion due to lack of preservative compound on bearing surfaces

60
Q

If a piece of machinery needs to be stored for prolonged periods, an attempt should be made to select a foundation that is ___

A

Isolated from other machinery that may cause undue vibrations

61
Q

If a piece of machinery needs to be stored for prolonged periods, to prevent rust and corrosion the bearings should be ___

A

Greased. Hand coat the bearings to limit corrosion

Oil bearings. Have the chamber filled with rust preventive oil

62
Q

If machinery is being stored for prolonged periods, and is directly exposed to weather or adverse atmospheric conditions, rotate the shaft ___, otherwise rotate the shaft ____ to keep ____

A

Once a month
Every several months
Bearing surfaces lubricated

63
Q

If machinery to be stored for prolonged periods has partial assemblies, such as rotors that have mounted bearings, the bearings should be ___

A

Coated with a preservative and wrapped with a plastic for foil

64
Q

Bearing temperature is a function of ___

A

Load, speed, lubricant, and outside heat sources

65
Q

The hand can usually be held in contact with a surface below __

A

131*F

66
Q

Do not insert a ____ thermometer into the bearing housing, whether against the bearing or in the grease or oil reservoir to take the temperature of the bearing

A

Liquid-in-glass

67
Q

If temperature rises in a bearing immediately after start up in a grease bearing application it is probably because ___

A

The grease has slumped into the races

68
Q

If temperature rises in a bearing immediately after start up in an oil lubricated application then ___. If the level is satisfactory, the ___ may be clogged or inoperative

A

Stop the unit and immediately check that the oil level is in accordance with the instruction
Circulating system

69
Q

If the temperature rises in a bearing immediately after the bearing has been lubricated with grease then ___

A

The cause may be an excessive quantity of grease or the wrong type

70
Q

If the bearing is over greased ___

A

Remove the drain plug and allow the excess to drain

71
Q

If the grease in the bearing is the wrong type ___

A

Disassemble and clean the bearing

72
Q

If there is excessive loading of the bearing, excessive bearing preload, excessive shaft or housing interference, or external bearing overload then ___

A

Check the alignment during mounting and check for tight-fitting seals

73
Q

Maximum temperature limit for general bearing applications

A

230*F

74
Q

When bearing temperature is unexpectedly high, or any time the temperature exceeds limitations, an ___ should be completed

A

Examination of the bearing

75
Q

In rotating machinery, the amplitude of bearing vibration is a function of ___

A

Bearing quality, seat geometry, and fit-up

MK2 (4 decks)

Brainscape helps you reach your goals faster, through stronger study habits.
© 2024 Bold Learning Solutions. Terms and Conditions