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°.
Budgeting and Budgetary Control: The next element of financial management is budgeting and budgetary control. Budgeting is an integral part of the management accounting proces
Federal Agency Securities are those securities issued by federally related institutions and those issued by Government-Sponsored Enterprises (GSE). Securities iss
What is nondiversifiable risk? How is it measured? But for the returns of one-half the assets in a portfolio are flawlessly negatively correlated with the other half-which is e
when asked to calculate return method given cash flow before depreciation how do you do it
Calculate Current cash debt coverage ratio: Financial statements for Delta Company are presented below: Delta Company Balance Sheet December 31, 2012
Q. Rate of the growth of the business? The working capital requirement of the a concern increase with the growth and expansion of the business activity although it is difficu
Question: (a) Explain and discuss the hedging strategies using futures (b) Boeing (an American company) delivered on 1st September 2008 an airplane to a Canadian company.
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
Question 1: Explain clearly how the study of Public Policy making enables us to understand how Government tackles the major problems of society. Question 2: Analyse th
Credit Markets: The financial system enables supply of funds to support purchase of goods and services and to finance capital investments. In this way, it provides funds both t
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