Power Enigeering types of bearing lubrication

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The objective of this session is to introduce the subject of software engineering. When you have read this session you will understand what software engineering is and why it is important, know the answers to key questions which provide an introduction to software engineering, understand ethical and professional issues which are important for software engineers.

Introduction

Virtually all countries now depend on complex computer-based systems. More and more products incorporate computers and controlling software in some form. The software in these systems represents a large and increasing proportion of the total system costs. Therefore, producing software in a cost-effective way is essential for the functioning of national and international economies.

Software engineering is an engineering discipline whose goal is the cost-effective development of software systems. Software is abstract and intangible. It is not constrained by materials, governed by physical laws or by manufacturing processes. In some ways, this simplifies software engineering as there are no physical limitations on the potential of software. In other ways, however, this lack of natural constraints means that software can easily become extremely complex and hence very difficult to understand.

Software engineering is still a relatively young discipline. The notion of ‘software engineering’ was first proposed in 1968 at a conference held to discuss what was then called the ‘software crisis’. This software crisis resulted directly from the introduction of powerful, third generation computer hardware. Their power made hitherto unrealisable computer applications a feasible proposition. The resulting software was orders of magnitude larger and more complex than previous software systems.

Early experience in building these systems showed that an informal approach to software development was not good enough. Major projects were sometimes years late. They cost much more than originally predicted, were unreliable, difficult to maintain and performed poorly. Software development was in crisis. Hardware costs were tumbling whilst software costs were rising rapidly. New techniques and methods were needed to control the complexity inherent in large software systems.

These techniques have become part of software engineering and are now widely although not universally used. However, there are still problems in producing complex software which meets user expectations, is delivered on time and to budget. Many software projects still have problems and this has led to some commentators (Pressman, 1997) suggesting that software engineering is in a state of chronic affliction.

As our ability to produce software has increased so too has the complexity of the software systems required. New technologies resulting from the convergence of computers and communication systems place new demands on software engineers. For this reason and because many companies do not apply software engineering techniques effectively, we still have problems. Things are not as bad as the doomsayers suggest but there is clearly room for improvement.

Quiz PDF eBook: 
Power Enigeering types of bearing lubrication
Download PE Quiz PDF eBook
23 Pages
2013
English US
Educational Materials



Sample Questions from the Power Enigeering types of bearing lubrication Quiz

Question: Fluid film lubrication:

Choices:

Removes all friction in the bearing

Is used during low ambient temperature conditions

Is used for heavy loads

Is used for light loads

is used in all anti-friction bearings

Question: When grease is used in an antifriction bearing, the bearing housing should not be filled more than _____ full.

Choices:

1/4

3/4

1/3

completly

1/2

Question: the proper way to store a bearing after cleaning is to dip it in a _____ preventative and wrap it in grease-proof paper.

Choices:

Chemical

rust

gas

moisture

air

Question: Viscosity index scale for oil ranges from:

Choices:

100 to 1000

0-1000

0-10

10-100

0-100

Question: When inspect a dismantled bearing, the first indication of a failing bearing is:

Choices:

cracked balls

rust or corrosion

discoloration

tapered rollers

roughness

Question: Thrust bearings: 1. Are used on reaction turbines 3. Are always installed on both ends of the rotor shaft 2. Prevent the turbine rotor from moving axially 4. Are lubricated with the same oil as the main bearings

Choices:

1234

134

234

124

123

Question: Synthetic oils have the desirable properties of being: 1. Resistant to sludge 3. Resistant to oxidation 2. Cheap 4. Highly viscous

Choices:

24

14

12

13

23

Question: Lubricating oil can act as a sealant when used in a/an:

Choices:

Overspeed trip

Compressor cylinder wall

Pump impeller

Rotary compressor

Antifriction bearing

Question: The viscosity of oil is expressed in units abbreviated by:

Choices:

sru

srv

ssu

sas

ssb

Question: The most common cause of lubrication problems in anti-friction bearings is:

Choices:

Lack of attention

Over lubrication

Improper additives in lubricants

Oversized ball bearing races

Contaminated lubricant

Question: In a bearing, the lubricant reduces the heat produced by

Choices:

Friction reduction

Corrosion reduction

Proper sealing

Wear reduction

Shock absorption

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