Already have an account? Get multiple benefits of using own account!
Login in your account..!
Remember me
Don't have an account? Create your account in less than a minutes,
Forgot password? how can I recover my password now!
Enter right registered email to receive password!
Q. Three-phase source voltages and phase sequence?
The elementary three-phase, two-pole generator shown in Figure has three identical stator coils (aa, bb, and cc) of one or more turns, displaced by 120° in space from each other. The rotor carries a ?eld winding excited by the dc supply through brushes and slip rings. When the rotor is driven at a constant speed, voltages of equal amplitude but different phase angle will be generated in the three phases in accordance with Faraday's law. Each of the three stator coils constitutes one phase of this single generator. If the ?eld structure is so designed that the ?ux is distributed sinusoidally over the poles, the ?ux linking any phase will vary sinusoidally with time, and sinusoidal voltages will be induced in the three phases. These three induced voltage waves will be displaced by 120 electrical degrees in time because the stator phases are displaced by 120° in space. When the rotor is driven counterclockwise, Figure (a) shows the wave forms and Figure (b) depicts the corresponding phasors of the three voltages. The time origin and the reference axis are chosen on the basis of analytical convenience. In a balanced system, all three phase voltages are equal in magnitude but differ from each other in phase by 120°. The sequence of voltages in Figure 4.1.2(b), corresponding to that of Figure (a), is known as the positive sequence (a-b-c). On the other hand, if the rotor is driven clockwise, then Figure (c) shows the corresponding phasor of the three voltages; the sequence of voltages in Figure (c) is known as negative sequence (a-c-b). Notice that in positive sequence ¯Ebb lags ¯Eaa by 120°, and ¯Ecc lags ¯Ebb by 120°; in negative sequence, however, ¯ Ecc lags ¯ Eaa by 120°, and ¯ Ebb lags ¯ Ecc by 120°.
Modern approach at financial problems With the advent of technology and need to tighten shipsdue to competition, financial management became as much a science as art. Efficient
Q. Explain about receivables management? Receivable Management: - The term receivables demote to debt owed to the firm by the customers resulting from sale of goods or else ser
Question 1 Briefly explain the important legislations that regulates the insurance sector Question 2 What do you mean by sales cycle? Briefly explain the different stages in
Investment banks and securities firms Investment banks support corporations or governments in the issue of new debt or equity securities. Investment banking comprises Th
Read the journal article Lafferty, B. A., & Hult, G. T. M. (2001) ‘A synthesis of contemporary market orientation perspectives’, European Journal of Marketing, 35 (1/2), pp. 92–109
What is the primary assumption behind the experience approach to forecasting? The experience approach to forecasting is relies on the assumption that things will happen a fixed
These securities aid in unpacking the cash flows from a pass-through. The most uncomplicated stripped mortgage-backed securities are the PO-IO-security. Unlike a
Best practice or functional benchmarking Compare an internal function to 'the best' however not necessarily an organisation in same industry for example compare administrati
The exchange rate uncertainty may not essentially mean that firms face exchange risk exposure. Describe why this may be the case. Answer: A firm can comprise a natural hedging p
Setting Budget Goals and Objectives: Having collected and analysed all relevant information, and made general forecasts as to the key areas of concern / opportunity and special
Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!
whatsapp: +91-977-207-8620
Phone: +91-977-207-8620
Email: [email protected]
All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd