solve k = 20.275 d) P ( 17 < X < 21) P ( (17 -18)/2.5 < Z < ( 21-18)/2.5) P ( -0.4 < Z < 1.2) = 0.8849 – 0.3446 = 0.5403 ( 4 decimal places) 4. In a sample of 25 observations from a Normal Distribution with mean 98.6 and standard deviation 17.2‚ find: Ans: a) n = 25‚ [pic] = ( = 98.6‚ [pic] = /n = 17.2/(25 = 3.44 [pic]( N
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AC Motors vs DC Motors DC Motors Prof. Dr. M. Zahurul Haq zahurul@me.buet.ac.bd http://teacher.buet.ac.bd/zahurul/ Department of Mechanical Engineering Bangladesh University of Engineering & Technology e316.eps ME 475: Mechatronics AC motors are smaller in size‚ reliable and less costly. AC motors run at fixed speed set by the line frequency. Easy speed‚ torque & direction controls in DC motors. DC motors are generally operate at lower voltages which makes these easier to interface with control
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Inequality refers to the way socially defined groups of individuals are positioned within their society as gender‚ class‚ age and ethnicity. This also involves the unequal distribution of social goods and services such as the labour market‚ health care and education (Chenoweth & McAuliffe 2012). Inequality can have many negative effects on the community and the way we live in our society. Donnison (2013) examines inequality in Britain and the damages most people will experience during their course
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Study Questions for cases Verklar Case 1) Why is Verklar’s market share dropping in the Austrian market in the early 1980s? 2) How would the quota system change the way channel flows are performed in Verklar Austria’s channel? 3) Comment on the efficiency (i.e.‚ cost) and effectiveness (i.e.‚ satisfaction) implications of implementing the quota system. 4) Based on your previous answer; is the quota system a good solution to Verklar Austria’s problem? 5) What potential pitfalls should be
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Problem Definition John Bridges‚ the chief electrical engineer of Hamilton Oil Company‚ has concluded through motor testing that DMC competitors Spartan Motors and the Universal Motor Company of Canada offer the first and second choice motors on the market‚ respectively. DMC’s position as the third choice could prove quite detrimental to its market share because Hamilton is the largest active oil company in Canada‚ operating over 30% of producing wells‚ and Bridges is extremely influential in
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1. Marketing Channel Analysis The furniture industry is a very lucrative business that spans domestic and international markets. With that fact in mind‚ it goes without saying that different channels of distribution exist with regards to delivery of furniture from manufacturer to consumer. Furniture manufacturers who target the domestic market segment have three (3) major marketing distribution channels: (1) Through online shopping portals‚ (2) through public showrooms in malls‚ and (3) through
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Chapter – IV Managing Risks in Mergers‚ Acquisitions and Strategic Alliances “There is a serious problem facing senior executives who choose acquisitions as a corporate growth strategy. My study reveals that fully 65 per cent of major strategic acquisitions have been failures. And some have been truly major failures resulting in dramatic losses of value for the shareholders of the acquiring company. With market values and acquisition premiums at record highs‚ it is time to articulate demanding
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SISTEMAS DC Motors Catedrático: Ing. Gustavo Mendoza Leal Alumno: Alfredo Valdés Cárdenas Introduction A DC motor is a type of electrical machine that converts direct current into mechanical power by means of a magnetic field. DC motors are widely used in field applications because of their many advantages over AC motors such as speed control‚ high starting torque‚ quick starting‚ stopping‚ reverse and acceleration and free from harmonics found in AC. Applications of DC motors include but
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UC3638 Advanced PWM Motor Controller FEATURES • • • • • • • • Single or Dual Supply Operation Accurate High Speed Oscillator Differential X5 Current Sense Amplifier Bidirectional Pulse-by-Pulse Current Limiting Programmable Oscillator Amplitude and PWM Deadband Dual 500mA Totem Pole Output Drivers Dual 60V‚ 50mA Open Collector Drivers Undervoltage Lockout DESCRIPTION The UC1638 family of integrated circuits are advanced pulse width modulators intended for a variety of PWM motor drive and amplifier
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ultrasonic motor INTRODUCTION All of us know that motor is a machine which produces or imparts motion‚ or in detail it is an arrangement of coils and magnets that converts electric energy into mechanical energy and ultrasonic motors are the next generation motors. In 1980‚the world’s first ultrasonic motor was invented which utilizes the piezoelectric effect in the ultrasonic frequency range to provide its motive force resulting in a motor with unusually good low speed‚ high torque
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