questions on Thrust Bearing design 1. You have been asked to design a minimum power-loss‚ uni-directional‚ thrust bearing for an horizontally-mounted‚ axial‚ ammonia compressor in a nitric acid plant. The compressor has a shaft diameter of 100 mm and generates a thrust of 15kN when operating at 6‚000 rpm. The thrust is negligible at zero speed. a. What type of thrust bearing would you recommend and why? b. What are the physical reasons why a dry‚ PTFE bearing would be unacceptable
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Validity is about the extent to which a piece of research in finding out what the research is finding out what the researcher intents to find out. The idea of validity means that something is true and can be believed. When people say ‘that’s a valid point”‚ they mean that the point is relevant‚ meaningful and believable. It is concerned with truth and value‚ that is whether conclusions are correct or not. It also considers whether the method‚ approaches and techniques actually relate to what is being
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Validity Validity addresses whether the assessment measures what it is supposed to measure (Gormley‚ 2011; Van der Vleuten‚ 1996). For both the OSCE stations that I have designed‚ I have created a complimentary mark scheme. As discussed previously‚ I opted to produce a global rating scale for the history-taking station and a checklist for the procedural skill station (appendix 1 and 2). Weighting of items can improve validity of a checklist‚ which can affect which trainees pass or fail (Sandilands
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My Beautiful Place Have you ever felt like you were born in the wrong era? I ask this because I know I do. The place that I consider beautiful is America‚ but please bear with me for a second and let me explain. I’m not talking about the America built on people who are famous for just being famous or the obese population produced by Mc Donald’s‚ I’m not even referring to the weather (yes I’m still bitter about the excuse of a “summer” we get in Ireland). To me America isn’t beautiful anymore but
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Reliability It means the extent to which a test is consistent and dependable. It is concerned with the consistency of responses from moment to moment. However‚ it may not always be valid. Techniques in Testing the Reliability of Assessment Methods or RAM I. Test-retest Method The same test is administered twice to the same group of student and the correlation coefficient is determined. Disadvantages: 1. When the time interval is short‚ the respondents may recall their previous responses resulting
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Exploring Reliability and Validity Researchers have constructed instruments in attempt to empirically measure values and culture belief systems of people and societies. In order for one to measure what some may consider subjective meanings; concrete definitions were given to the types of values that were examined in the “Values and Motives Questionnaire” (Values and Motives Questionnaire‚ n.d.‚ p.1). The values examined were categorized as interpersonal‚ extrinsic‚ and intrinsic values (Values and
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Section 4 Information Systems in Organisations Chapter 37 – Management Information Systems Introduction Over the past two decades‚ a transformation to an information society has been taking place‚ and computers and telecommunications technologies have revolutionised the way that organisations operate. We live in an information age‚ and no business of any size can survive and compete without embracing information technology. Information has come to be recognised as a resource of fundamental importance
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Credible Information Debate 1 Credible Information Debate 2 There is much debate concerning the validity and reliability of Wikipedia. The internet has transformed the way we gather and learn information. Fifteen years
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Internet Credibility For a person who does not do research on the internet‚ credibility may not mean a whole lot. Due to ease of access to the internet‚ a lot of people use this source to retrieve information. But‚ when the internet is used for this purpose‚ it is important to follow certain guidelines. The first thing that comes to most people’s minds when they read something from the internet is‚ "Is this true?" One must learn to make up one’s mind by asking exploratory questions about the
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Website Credibility Credible Websites vs. Non-credible Websites Gathering information for academic purposes is very different nowadays. We not only have libraries to do research‚ we now have the Internet. There are numerous sources we can gather information from while searching the Internet‚ but we have to be careful in choosing a site that has credibility. A credible website is one that will have verifiable facts and credible editors who approve the validity of the facts (also known as gatekeepers);
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