Answer / sunil guru

HARMONICS --- BASICALLY ARE THE INTEGRAL MULTIPLE OF FUNDAMENTAL FREQUENCY.... WHICH CAUSES DISTORTION AND DISTURBANCES IN THE SYSTEM.....
AND IT RESULTS IN CHANGING OF THE SINUSOIDAL WAVE FORM..
SO THAT SYSTEM IS NOT GETTING PURE SINE WAVE AND ITS LOSSES ARE INCREASED AND WORKING EFFICIENCY IS DECREASED....

for any disagreement mail me at parmar20072008@yahoo.com

Answer / sharif enam

when a aperiodic signal is Fourier transformed we get many
sinusoid-es of different frequencies.They are called
harmonics. The frequencies which matches with the original
signal frequency is called first harmonic or fundamental.

Answer / javad ahamad

before 1960 actually harmonics was very little.but todays world we have so many electronics equipments like computer, tv,washing machines ect...these equipments draw some more current for short interval of time.therefore the actual sinusoidal wave hasbeen changed for that time.this is happen in all the distribution system.it s the odd multiple of fundamental wave,like 3rd harmonic,5th harmonic ect...we r using harmonic filter to avoid it..

Differentiate between voltage and current feedback in amplifiers?

0 Answers  

---

What is TVSS Protection???

2 Answers   Emerson,

---

what is the formula of starting current of 3phase and 1 phase motor???

0 Answers  

---

Define maximum demand?

0 Answers  

---

1. The DC generaror,s induced output emf is connected with a DC motor(as load). when increasing the load of the motor by using brake drum or any way. what are the parameters will changes in both motor and generator(voltage, current, resistance, frequency, speed, torque, power, flux etc...) 2. Similarly for AC generator and AC motor 3. similarly if using DC batteries instead of DC generator, What happens?

0 Answers   IBM, Kirloskar,

---

how to calculate the mf of kwh meter,if ct the ratio on meter is 100/5A

2 Answers  

---

how does the rotating m.m.f is produced in the 3-phase induction motor and how the poles are created in 3-phase induction motor ?

0 Answers  

---

can any one help me out by posting something related to rvnl interview for site engineer electrical.? what is the procedure? what kinda question they ask us? how long the interview goes? and any tips? and any thing you want to share?

1 Answers   RVNL,

---

how we calculate the motor rating of pump for water suction ?its any formula for that plz give thank u

3 Answers  

---

what's the difference between 'shaft power demand' and 'BHP' , when we consider electrical load list.

0 Answers   HEC,

---

what is method for testing CT

0 Answers   DCM,

---

what is working parincipal of a ht transformer

0 Answers   Pidilite,

---