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°.
• Prepare a Trend Analysis for the Balance Sheet, Income Statement and Cash Flow Statement • This should include about 12 accounts in the Balance Sheet and about 10 Income Statemen
three years ago, SSSG Ltd. issued 10 years $1000 bonds with a 7% coupon rate paid semi-annually, at par value. the market currently requires a 9% yield. what was the price of bond
What is the market risk premium in Spain at the present moment - the number which I have to use in the valuations? It is not possible to talk of "the" market premium for Spain.
Limitations of participation: 1. Technology and organization today are so complex that specialized work roles are required making it difficult for people to participate succes
The Nu-Nu Brothers Inc. (NNBI) has the following capital structure, which it considers to be optional: Debt 25% Preferred Stock 15% Common Equity 60% NNBI''''s expected net income
Definition of 'Hedge Fund': An aggressively managed portfolio of investments that uses advanced investment strategies define as leveraged, short, long and derivative positions
Define intermediation The financial system makes it probable for surplus and deficit economic units to come together, exchanging funds for securities, to their mutual advantage
The zero-volatility spread is a measure of the spread that the investor would realize over the entire Treasury spot rate curve if a mortgage-backed or asset-backe
Changes in the bond value is inversely related to the change in the interest rates. If an investor holds a long bond position, he would incur loss if the in
Explain the difference between performing the capital budgeting analysis from the parent firm’s perspective as opposed to the project perspective. The aim of the financial mana
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