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!
Explain the Tap Changing Transformers?
This is the most popular form of voltage control at all voltage levels. It is based on changing the turns ratio of the transformer, hence the voltage in the secondary circuit is varied and voltage control is obtained. Figure shows a schematic diagram of an off-load tap changer which requires the disconnection of the transformer when the tap setting is to be changed. Most transformers have on-load tap changers which is shown in a basic form in Figure.
In the position shown, the voltage is at minimum and the current divides equally in the two halves of the coil L resulting in zero resultant flux and minimum impedance. To increase the voltage, S1 opens and the total current passes through the other half of the reactor. Selector switch A then moves to the next contact and S1 closes. A circulating current now flows in L superimposed on the load current. Then, S2 opens and B moves to the next tapping; S2 then closes and the operation is complete. To avoid large voltage disturbances, the voltage change between taps is normally small; about 1.25 % of the nominal voltage. The total range of tapping varies with the transformer usage, a typical figure for generator transformers is +2% to -16% in 18 steps.
Find V and I in the figure given below using ideal diode model
NPN: Figure: The symbol of an NPN Bipolar Junction Transistor. NPN is one of the two sorts of bipolar transistors, where the letters "N" (negative) and "P" (positi
uses of ferromagnatic transformer
Q. What is meant by biasing transistor? The purpose of dc biasing of transistor is to obtain a certain dc collector current at a certain dc collector voltage. These values of c
Addressing Model As we have learned already that each instruction has two parts one is op code and another is operand. Op code specified the type of operations to be
Explain Sampling at the Nyquist Rate? What would happen if we reduced the sampling frequency? In the time domain, we would be getting less samples for each period. In the frequ
Q. An RL series circuit carries a current of 0.02 cos 5000t A. For R = 100 and L = 20 mH, find the impedance of the series combination and determine the voltage across the series
what is crossmagnetisation in dc generator
Q. Explain working of CRT with suitable diagram discuss the focusing arrangement. What is need of aquadag? OR Why are the operating voltages of a cathode ray tube arran
#What are the types of Negative Feedback Amplifier?
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