# Search results

1. ### Field Oriented Control Clarification

Hi, The controller is normally designed in such a way that it acts like a mirror image of the physical system it is going to control. In this case, the physical system i.e, the motor takes voltage as input and its response is measured as current. We know the mathematical model of the motor...
2. ### DC Drive rating to run DC Shunt Generator

You may need to consider the losses in the motor (its efficiency) while calculating the required motor rating for your generator.
3. ### Simulink help for getting a frequency I can use as an input

Hi, You can use PLL block in Simulink to find the frequency of the signal. Both single and three-phase PLLs are available in Simulink.
4. ### Three phase supply

The phase means the angular difference between the sinusoidal voltage on one wire to another. For three phase, the angular difference would be 360/3 = 120 deg. Instead of having three independent single phase transmission system which require (phase + neutral wire for each phase) 2*3 = 6 wires...
5. ### Three phase circuits

The arrow denotes the sign of voltage induced in the winding when current flows in that direction. For example if current flows from terminal n to R, the voltage across the winding denoted by VnR is positive.
6. ### How not to get stuck up with one approach?

Hi, I am used to do things independently in my life and rarely takes the advice of others. The one important problem I often face is, whenever I try a method i always stick to it even if it doesn't work. I try to fight with the same approach to find solution to the problem in hand. Though I am...
7. ### Horoscope and its effects on marriage

Hi I am from India, a Hindu by birth (Hinduism is a religion). Here horoscope match is considered essential for marriage. My horoscope was found to be bad since it contains http://en.wikipedia.org/wiki/Mangal_Dosha" [Broken] (Mars danger) and naga dosha (snake danger). It is believed that if a...
8. ### Engineering How will having a master's degree in engineering change your career path ?

I dont know about the status in your country. But I can say my experience in India. After completing my bachelor's degree in electrical engineering, I was able to get job as an electrical engineer. But the job profile was operation and maintenance of electrical machines in an aerospace...
9. ### Is it correct to give top priority for survival in academics?

Yes, I discussed with my Prof. and requested him for making a simplified version of my big problem so that I can finish within in a month or so. But at this moment I don't have time to complete my original problem as such. But my inner consciousness always says that I am doing wrong. I am...
10. ### Is it correct to give top priority for survival in academics?

Hi, I am a postgraduate student doing Master of Science(by research) in a reputed Institute in India. I registered for my course on January 2008 and I have not yet completed my course. The requirement for completion of this course is to get a research paper published in reputed journal...
11. ### Controllability Problem

The variables A and B need not be symbolic variables. Just declare A and B as double floats and use ctrb function. It worked for me.
12. ### Drawing electric charge from the earth

Why it will draw charge from earth? already the the capacitor and resistor are at zero potential. There is no closed path in the circuit and hence the capacitor cannot get charged. The law of conservation of energy has to be kept in mind. Work has to be done to charge a capacitor. Where does...
13. ### How to evaluate this indefinite integral?

why cant u take x^3 inside square root. Then it will be simplified to sqrt(1-x^2)/x which is easier to integrate
14. ### Matlab: How to get the PSD of a signal?

Which version of matlab you are using? i am using matlab 7.8 R2009a. In my version I have a function called 'dspdata.psd' in signal processing toolbox to find psd of input data.
15. ### Units of FFT in matlab

The units of FFT will be in volts only as you mentioned but i dont know the procedure to get it in terms of other units.
16. ### MATLAB Hi everyone. im a beginner to matlab, i want to calculate the fourier

you can use the fft function in matlab to find the frequency spectrum of the discrete signal. type 'help fft' in command prompt for more information
17. ### How to get amplitude and phase

There are many methods available. Short time Fourier transform, Wavelet transform, least squares method, auto regressive methods etc.
18. ### What is the largest number less than 1?

What about in the set of rational numbers Q which is countable
19. ### LaTeX Looking for TeX\LaTeX editor

There are many LaTeX editors freely available. You can choose one based on the operating system you use and your personal favor. LyX is somewhat user friendly and good for beginners. TeXworks, TeXmaker are also good editors. I use TeXNiC center in Windows environment.
20. ### Matlab question; ezsurf

Is 'e' in your equation is the exponential? if it is so then you have to use the Matlab function exp()
21. ### Is math physically real?

In my view nature and math can be viewed as two intersecting circles A and B where A \cap B relates to the part of nature which has mathematical description as we know today. Still many things in nature remain to be mathematically described, which is A - B . Same way we have math for some...
22. ### Understanding concept of Zener Diodes for voltage

The Vout will be negative (as Vin is negative and you are using non-inverting amplifier). This Vout is clipped by Z2 to -5.7 V
23. ### MATLAB Solve equtaion with sinh en coth in matlab

Hi, declare Bi and t also as syms variables, it worked for me
24. ### Step up transformers - confusion

It is not like that. Power loss in a cable is given by Ploss =I^2 R The voltage drop V in the cable depends on current I passing through the cable. This V is not the applied voltage Vs. Instead Vs= V+Vl where Vl is the load voltage (because resistance of cable is in series with load) So your...
25. ### Switching from parallel to series and keeping restistance the same.

Oh I didn't notice that it is the current through X which is same, sorry. Equating voltage across X in both cases and solving that should give Y.
26. ### Switching from parallel to series and keeping restistance the same.

I can give u a hint. Because the current is same (i) when Y is connected and (ii) Y disconnected and 50 ohm connected in circuit it means that total resistance in the circuit is same for both the cases. So you can equal the total resistance in 2 cases and solve for Y.
27. ### Newton's laws of motions

I think both. How much A is pushed back and its acceleration after collision is given by II law, and III law says A is affected by its pushing against B.
28. ### The Energy Expended by a turning wheel

I don't know math completely for finding energy to turn a wheel, but simply I can say that kinetic energy stored in a rotating wheel E=1/2*J*w^2 where, J is moment of inertia of wheel, w is the angular velocity. This is the energy,perhaps you have to impart to a standstill wheel to make it...
29. ### Passive Sign Convention

The fact is current never enters the negative terminal of a resistor (in the sense you mentioned) and the power will never be negative.
30. ### Passive Sign Convention

This is wrong example. A resistor can only dissipate power and it can't never supply power.