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°.
You are the chief financial office (CFO) of Gaga Enterprises, edgy fashion design firm. Your firm needs $10 million to expand production. How do you think the process of raising th
#qCash Dividend Ratio uestion..
what are the features of a comprehensive interest rate risk management programme
Q. What is usual Approach of capital Structure? Ans. Traditional Approach: - The traditional approach establishes middle among the Net Income approach and the Net Operating Inc
Emily Jill Rogers is planning to buy a house but needs assistance as to how she will finance the purchase. She has supplied you with some information and asked you to help her wit
d iscuss the relationship between finance management,economics,accounting, and mathematics. illustrate/show through a venn diagram
Non-traditional mortgages also referred to as Alternative Mortgage Instruments (AMIs), do not have level monthly payments, but employ some other structure of payment.
Under what circumstances would market to book value ratios be misleading? Explain. The Market to Book ratio is helpful, however it is only a irregular approximation of how li
What are the objectives of working capital management? Briefly explain the various elements of operating cycle.
A cash-flow yield is the discount rate that makes the price of a mortgage-backed or asset-backed security equal to the present value of its ca
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